private T GetTag <T>(ImageFileDirectory ifd0, ImageFileDirectory raw) where T : PentaxPefFile.ImageFileDirectoryEntry
{
T tag = ifd0.GetEntry <T>();
if (tag == null)
{
//try raw tag
tag = raw.GetEntry <T>();
}
return(tag);
}
public RawFile(string aFileName)
: base(aFileName)
{
//set some default values:
//color channels are assumed in order RGB if no tag present
mColorTwist = new float[3, 4];
mColorTwist[0, 0] = 1.0f;
mColorTwist[1, 1] = 1.0f;
mColorTwist[2, 2] = 1.0f;
mColorTwistIsIdentity = true;
//it seems as if only Pentax is capable of giving us that info
mRollAnglePresent = false;
mRecordingDate = new DateTime();
//read all IFDs/Tags:
byte a = mFileReader.ReadByte();
byte b = mFileReader.ReadByte();
bool fileIsLittleEndian;
if (a == b && b == 'I')
{
fileIsLittleEndian = true;
}
else
if (a == b && b == 'M')
{
fileIsLittleEndian = false;
}
else
{
throw new FileLoadException("Could not determine file endianess. Is this a proper TIFF/PEF/DNG file?", aFileName);
}
mEndianSwap = fileIsLittleEndian != BitConverter.IsLittleEndian;
ushort magicNumber = ReadUI2();
if (magicNumber != 42)
{
throw new FileLoadException("This is not a valid TIFF/PEF/DNG file: Magic number is not 42.", aFileName);
}
uint offsetToFirstIFD = ReadUI4();
mFile.Seek(offsetToFirstIFD, SeekOrigin.Begin);
mIfds = new List <ImageFileDirectory>();
while (true)
{
ImageFileDirectory ifd = new ImageFileDirectory(this);
mIfds.Add(ifd);
uint offsetToNext = ReadUI4();
if (offsetToNext == 0)
{
break;
}
Seek(offsetToNext, System.IO.SeekOrigin.Begin);
}
//until here PEF and DNG are the same. They diverge on how to read the tags
}
public PEFFile(string aFileName)
: base(aFileName)
{
ImageFileDirectory raw = SetMembers();
mRawImage = new ushort[mHeight, mWidth];
if (mHhuffmanTable != null && raw.GetEntry <IFDStripOffsets>().Value.Length == 1)
{
uint offset = raw.GetEntry <IFDStripOffsets>().Value[0];
Seek(offset, SeekOrigin.Begin);
int[,] vpred = new int[2, 2];
int[] hpred = new int[2];
unsafe
{
fixed(ushort *huff = mHhuffmanTable.Value)
{
getbithuff(-1, null);
for (int row = 0; row < mHeight; row++)
{
for (int col = 0; col < mWidth; col++)
{
int diff = ljpeg_diff(huff);
if (col < 2)
{
hpred[col] = vpred[row & 1, col] += diff;
}
else
{
hpred[col & 1] += diff;
}
mRawImage[row, col] = (ushort)hpred[col & 1];
}
}
}
}
}
else if (mHhuffmanTable != null)
{
throw new Exception("TODO: implement compressed multiple stripes");
}
else
{
//uncompressed
uint[] sizes = raw.GetEntry <IFDStripByteCounts>().Value;
uint[] offsets = raw.GetEntry <IFDStripOffsets>().Value;
uint rowsPerStrip = raw.GetEntry <IFDRowsPerStrip>().Value;
for (int strip = 0; strip < offsets.Length; strip++)
{
byte[] data;
Seek(offsets[strip], SeekOrigin.Begin);
data = mFileReader.ReadBytes((int)sizes[strip]);
uint pos = 0;
int bitOffset = 0;
for (int line = 0; line < rowsPerStrip; line++)
{
for (int pixel = 0; pixel < mWidth; pixel++)
{
int row = strip * (int)rowsPerStrip + line;
int col = pixel;
uint val = data[pos];
while (bitOffset < mBitDepth)
{
val = data[pos];
bitbuf = (bitbuf << 8) + val;
bitOffset += 8;
pos++;
}
val = bitbuf << (32 - bitOffset) >> (32 - mBitDepth);
bitOffset -= mBitDepth;
mRawImage[row, col] = (ushort)(val);
}
}
}
}
//close the file
Close();
}
public DNGColorSpec(uint aChannels, ImageFileDirectory ifd0, ImageFileDirectory raw)
{
fChannels = aChannels;
if (GetTag <IFDDNGCalibrationIlluminant1>(ifd0, raw) != null)
{
fTemperature1 = ConvertIlluminantToTemperature(GetTag <IFDDNGCalibrationIlluminant1>(ifd0, raw).Value);
}
else
{
fTemperature1 = 0.0;
}
if (GetTag <IFDDNGCalibrationIlluminant2>(ifd0, raw) != null)
{
fTemperature2 = ConvertIlluminantToTemperature(GetTag <IFDDNGCalibrationIlluminant2>(ifd0, raw).Value);
}
else
{
fTemperature2 = 0.0;
}
fColorMatrix1 = GetTag <IFDDNGColorMatrix1>(ifd0, raw)?.Matrix;
if (fColorMatrix1 == null)
{
fColorMatrix1 = DNGMatrix.Identity(fChannels); //best choice if nothing is given...
}
fColorMatrix2 = GetTag <IFDDNGColorMatrix2>(ifd0, raw)?.Matrix;
if (fColorMatrix2 == null)
{
fColorMatrix2 = new DNGMatrix();
}
fForwardMatrix1 = GetTag <IFDDNGForwardMatrix1>(ifd0, raw)?.Matrix;
if (fForwardMatrix1 == null)
{
fForwardMatrix1 = new DNGMatrix();
}
fForwardMatrix2 = GetTag <IFDDNGForwardMatrix2>(ifd0, raw)?.Matrix;
if (fForwardMatrix2 == null)
{
fForwardMatrix2 = new DNGMatrix();
}
fReductionMatrix1 = GetTag <IFDDNGReductionMatrix1>(ifd0, raw)?.Matrix;
if (fReductionMatrix1 == null)
{
fReductionMatrix1 = new DNGMatrix();
}
fReductionMatrix2 = GetTag <IFDDNGReductionMatrix2>(ifd0, raw)?.Matrix;
if (fReductionMatrix2 == null)
{
fReductionMatrix2 = new DNGMatrix();
}
fCameraCalibration1 = GetTag <IFDDNGCameraCalibration1>(ifd0, raw)?.Matrix;
fCameraCalibration2 = GetTag <IFDDNGCameraCalibration1>(ifd0, raw)?.Matrix;
if (fCameraCalibration1 == null)
{
fCameraCalibration1 = DNGMatrix.Identity(fChannels);
}
if (fCameraCalibration2 == null)
{
fCameraCalibration2 = DNGMatrix.Identity(fChannels);
}
fAnalogBalance = GetTag <IFDDNGAnalogBalance>(ifd0, raw)?.Vector.AsDiagonal();
if (fAnalogBalance == null)
{
fAnalogBalance = DNGMatrix.Identity(fChannels);
}
fForwardMatrix1 = NormalizeForwardMatrix(fForwardMatrix1);
fColorMatrix1 = fAnalogBalance * fCameraCalibration1 * fColorMatrix1;
if (fColorMatrix2.IsEmpty() ||
fTemperature1 <= 0.0 ||
fTemperature2 <= 0.0 ||
fTemperature1 == fTemperature2)
{
fTemperature1 = 5000.0;
fTemperature2 = 5000.0;
fColorMatrix2 = fColorMatrix1;
fForwardMatrix2 = fForwardMatrix1;
fReductionMatrix2 = fReductionMatrix1;
fCameraCalibration2 = fCameraCalibration1;
}
else
{
fForwardMatrix2 = NormalizeForwardMatrix(fForwardMatrix2);
fColorMatrix2 = fAnalogBalance * fCameraCalibration2 * fColorMatrix2;
// Swap values if temperatures are out of order.
if (fTemperature1 > fTemperature2)
{
double temp = fTemperature1;
fTemperature1 = fTemperature2;
fTemperature2 = temp;
DNGMatrix T = fColorMatrix1;
fColorMatrix1 = fColorMatrix2;
fColorMatrix2 = T;
T = fForwardMatrix1;
fForwardMatrix1 = fForwardMatrix2;
fForwardMatrix2 = T;
T = fReductionMatrix1;
fReductionMatrix1 = fReductionMatrix2;
fReductionMatrix2 = T;
T = fCameraCalibration1;
fCameraCalibration1 = fCameraCalibration2;
fCameraCalibration2 = T;
}
}
IFDDNGAsShotNeutral neutral = GetTag <IFDDNGAsShotNeutral>(ifd0, raw);
IFDDNGAsShotWhiteXY asShot = GetTag <IFDDNGAsShotWhiteXY>(ifd0, raw);
DNGxyCoord white;
if (asShot == null)
{
if (neutral == null)
{
throw new ArgumentException("The DNG spec says that one of the As Shot White balance tags must be present.");
}
DNGVector vec = new DNGVector((uint)neutral.Value.Length);
for (uint c = 0; c < neutral.Value.Length; c++)
{
vec[c] = neutral.Value[c].Value;
}
double unify = 1.0 / vec.MaxEntry();
vec = unify * vec;
white = NeutralToXY(vec);
}
else
{
double x = asShot.Value[0].Value;
double y = asShot.Value[1].Value;
white = new DNGxyCoord(x, y);
}
WhiteXY = white;
}
public PEFFile(string aFileName)
: base(aFileName)
{
byte a = mFileReader.ReadByte();
byte b = mFileReader.ReadByte();
bool fileIsLittleEndian;
if (a == b && b == 'I')
{
fileIsLittleEndian = true;
}
else
if (a == b && b == 'M')
{
fileIsLittleEndian = false;
}
else
{
throw new FileLoadException("Could not determine file endianess. Is this a proper TIFF/PEF file?", aFileName);
}
mEndianSwap = fileIsLittleEndian != BitConverter.IsLittleEndian;
ushort magicNumber = ReadUI2();
if (magicNumber != 42)
{
throw new FileLoadException("This is not a valid TIFF/PEF file: Magic number is not 42.", aFileName);
}
uint offsetToFirstIFD = ReadUI4();
mFile.Seek(offsetToFirstIFD, SeekOrigin.Begin);
List <ImageFileDirectory> ifds = new List <ImageFileDirectory>();
while (true)
{
ImageFileDirectory ifd = new ImageFileDirectory(this);
ifds.Add(ifd);
uint offsetToNext = ReadUI4();
if (offsetToNext == 0)
{
break;
}
Seek(offsetToNext, System.IO.SeekOrigin.Begin);
}
//Raw Data:
ImageFileDirectory raw = ifds[0];
IFDExif exif = raw.GetEntry <IFDExif>();
mISO = exif.GetEntry <ExifEntry.ExifISOSpeedRatings>().Value;
mBitDepth = raw.GetEntry <IFDBitsPerSample>().Value;
ExifEntry.ExifMakerNote makernote = exif.GetEntry <ExifEntry.ExifMakerNote>();
mBayerPattern = exif.GetEntry <ExifEntry.ExifCFAPattern>().Value;
mBayerWidth = exif.GetEntry <ExifEntry.ExifCFAPattern>().xCount;
mBayerHeight = exif.GetEntry <ExifEntry.ExifCFAPattern>().yCount;
MNHuffmanTable huffmanTable = makernote.Value.GetEntry <MNHuffmanTable>();
mWhiteLevel = makernote.Value.GetEntry <MNWhiteLevel>();
mWhitePoint = makernote.Value.GetEntry <MNWhitePoint>();
mBlackPoint = makernote.Value.GetEntry <MNBlackPoint>();
mScaling = makernote.Value.GetEntry <MNDataScaling>();
mWidth = (int)raw.GetEntry <IFDImageWidth>().Value;
mHeight = (int)raw.GetEntry <IFDImageLength>().Value;
uint offset = raw.GetEntry <IFDStripOffsets>().Value[0];
Seek(offset, SeekOrigin.Begin);
mRawImage = new ushort[mHeight, mWidth];
int[,] vpred = new int[2, 2];
int[] hpred = new int[2];
unsafe
{
fixed(ushort *huff = huffmanTable.Value)
{
getbithuff(-1, null);
for (int row = 0; row < mHeight; row++)
{
for (int col = 0; col < mWidth; col++)
{
int diff = ljpeg_diff(huff);
if (col < 2)
{
hpred[col] = vpred[row & 1, col] += diff;
}
else
{
hpred[col & 1] += diff;
}
mRawImage[row, col] = (ushort)hpred[col & 1];
}
}
}
}
}
private ImageFileDirectory SetMembers()
{
//Raw Data:
ImageFileDirectory raw = mIfds[0];
IFDExif exif = raw.GetEntry <IFDExif>();
mISO = exif.GetEntry <ExifISOSpeedRatings>().Value;
mExposureTime = exif.GetEntry <ExifExposureTime>().Value;
mRecordingDate = exif.GetEntry <ExifDateTimeDigitized>().Value;
mBitDepth = raw.GetEntry <IFDBitsPerSample>().Value[0];
ExifMakerNote makernote = exif.GetEntry <ExifMakerNote>();
//needed to decompress image data:
mHhuffmanTable = makernote.Value.GetEntry <MNHuffmanTable>();
ExifCFAPattern.BayerColor[] bayer = exif.GetEntry <ExifCFAPattern>().Value;
mBayerPattern = new BayerColor[bayer.Length];
for (int i = 0; i < bayer.Length; i++)
{
mBayerPattern[i] = (BayerColor)(int)bayer[i];
}
MNWhiteLevel whiteLevel = makernote.Value.GetEntry <MNWhiteLevel>();
MNWhitePoint whitePoint = makernote.Value.GetEntry <MNWhitePoint>();
MNBlackPoint blackPoint = makernote.Value.GetEntry <MNBlackPoint>();
MNDataScaling scaling = makernote.Value.GetEntry <MNDataScaling>();
float whiteLevelAll = (float)Math.Pow(2, mBitDepth);
if (whiteLevel != null)
{
whiteLevelAll = whiteLevel.Value;
}
mBlackLevel = new float[3];
if (blackPoint != null)
{
//only one value for all colors
if (blackPoint.Value.Length == 1)
{
mBlackLevel[0] = (float)blackPoint.Value[0];
mBlackLevel[1] = (float)blackPoint.Value[0];
mBlackLevel[2] = (float)blackPoint.Value[0];
}
//values per color channel
if (blackPoint.Value.Length == 3)
{
mBlackLevel[0] = (float)blackPoint.Value[0];
mBlackLevel[1] = (float)blackPoint.Value[1];
mBlackLevel[2] = (float)blackPoint.Value[2];
}
//values per color bayer pattern
if (blackPoint.Value.Length == 4)
{
//red
int indexR = -1;
for (int i = 0; i < mBayerPattern.Length; i++)
{
if (mBayerPattern[i] == BayerColor.Red)
{
indexR = i;
break;
}
}
mBlackLevel[0] = (float)blackPoint.Value[indexR];
//blue
int indexB = -1;
for (int i = 0; i < mBayerPattern.Length; i++)
{
if (mBayerPattern[i] == BayerColor.Blue)
{
indexB = i;
break;
}
}
mBlackLevel[2] = (float)blackPoint.Value[indexB];
//green, the two remaining indices
int indexG1 = -1, indexG2 = -1;
for (int i = 0; i < mBayerPattern.Length; i++)
{
if (mBayerPattern[i] == BayerColor.Green && indexG1 == -1)
{
indexG1 = i;
}
if (mBayerPattern[i] == BayerColor.Green && indexG1 != -1)
{
indexG2 = i;
}
}
float g1 = (float)blackPoint.Value[indexG1];
float g2 = (float)blackPoint.Value[indexG2];
mBlackLevel[1] = Math.Max(g1, g2); //well, one could distinguish the two greens, but what for?
}
}
mWhiteLevel = new float[] { whiteLevelAll, whiteLevelAll, whiteLevelAll };
mWhiteLevel[0] -= mBlackLevel[0];
mWhiteLevel[1] -= mBlackLevel[1];
mWhiteLevel[2] -= mBlackLevel[2];
float scale = scaling.Value;
mWhiteBalance = new float[] { whitePoint.Value[0] / scale, whitePoint.Value[1] / scale, whitePoint.Value[3] / scale };
if (makernote.Value.GetEntry <MNLevelInfo>() != null)
{
mRollAngle = makernote.Value.GetEntry <MNLevelInfo>().Value.RollAngle;
mRollAnglePresent = true;
}
mWidth = (int)raw.GetEntry <IFDImageWidth>().Value;
mHeight = (int)raw.GetEntry <IFDImageLength>().Value;
//look for orientation tag.
if (raw.GetEntry <IFDOrientation>() != null)
{
mOrientation = new DNGOrientation(raw.GetEntry <IFDOrientation>().Value);
}
else
{
//no tag found, use default
mOrientation = new DNGOrientation(DNGOrientation.Orientation.Normal);
}
//we always crop at least two pixels because of our algos...
mCropLeft = 2;
mCropTop = 2;
mCroppedWidth = mWidth - 4;
mCroppedHeight = mHeight - 4;
mMake = raw.GetEntry <IFDMake>().Value;
mUniqueModelName = raw.GetEntry <IFDModel>().Value;
//missing data, like noise model, crop area, etc..., must be loaded afterwards!
double[] colorMatrix = new double[] { 1, 0, 0, 0, 1, 0, 0, 0, 1 };
mColorSpec = new DNGColorSpec(colorMatrix, colorMatrix, IFDDNGCalibrationIlluminant.Illuminant.D50, IFDDNGCalibrationIlluminant.Illuminant.D50, mWhiteBalance);
return(raw);
}
public PEFFile(string aFileName, bool HeaderOnly)
: base(aFileName)
{
byte a = mFileReader.ReadByte();
byte b = mFileReader.ReadByte();
bool fileIsLittleEndian;
if (a == b && b == 'I')
{
fileIsLittleEndian = true;
}
else
if (a == b && b == 'M')
{
fileIsLittleEndian = false;
}
else
{
throw new FileLoadException("Could not determine file endianess. Is this a proper TIFF/PEF file?", aFileName);
}
mEndianSwap = fileIsLittleEndian != BitConverter.IsLittleEndian;
ushort magicNumber = ReadUI2();
if (magicNumber != 42)
{
throw new FileLoadException("This is not a valid TIFF/PEF file: Magic number is not 42.", aFileName);
}
uint offsetToFirstIFD = ReadUI4();
mFile.Seek(offsetToFirstIFD, SeekOrigin.Begin);
List <ImageFileDirectory> ifds = new List <ImageFileDirectory>();
while (true)
{
ImageFileDirectory ifd = new ImageFileDirectory(this);
ifds.Add(ifd);
uint offsetToNext = ReadUI4();
if (offsetToNext == 0)
{
break;
}
Seek(offsetToNext, System.IO.SeekOrigin.Begin);
}
//Raw Data:
ImageFileDirectory raw = ifds[0];
IFDExif exif = raw.GetEntry <IFDExif>();
mISO = exif.GetEntry <ExifEntry.ExifISOSpeedRatings>().Value;
mBitDepth = raw.GetEntry <IFDBitsPerSample>().Value;
ExifEntry.ExifMakerNote makernote = exif.GetEntry <ExifEntry.ExifMakerNote>();
mBayerPattern = exif.GetEntry <ExifEntry.ExifCFAPattern>().Value;
mBayerWidth = exif.GetEntry <ExifEntry.ExifCFAPattern>().xCount;
mBayerHeight = exif.GetEntry <ExifEntry.ExifCFAPattern>().yCount;
MNHuffmanTable huffmanTable = makernote.Value.GetEntry <MNHuffmanTable>();
mWhiteLevel = makernote.Value.GetEntry <MNWhiteLevel>();
mWhitePoint = makernote.Value.GetEntry <MNWhitePoint>();
mBlackPoint = makernote.Value.GetEntry <MNBlackPoint>();
mScaling = makernote.Value.GetEntry <MNDataScaling>();
mWidth = (int)raw.GetEntry <IFDImageWidth>().Value;
mHeight = (int)raw.GetEntry <IFDImageLength>().Value;
uint offset = raw.GetEntry <IFDStripOffsets>().Value[0];
}
public DNGFile(string aFileName, bool HeaderOnly)
: base(aFileName)
{
byte a = mFileReader.ReadByte();
byte b = mFileReader.ReadByte();
bool fileIsLittleEndian;
if (a == b && b == 'I')
{
fileIsLittleEndian = true;
}
else
if (a == b && b == 'M')
{
fileIsLittleEndian = false;
}
else
{
throw new FileLoadException("Could not determine file endianess. Is this a proper TIFF/PEF file?", aFileName);
}
mEndianSwap = fileIsLittleEndian != BitConverter.IsLittleEndian;
ushort magicNumber = ReadUI2();
if (magicNumber != 42)
{
throw new FileLoadException("This is not a valid TIFF/PEF file: Magic number is not 42.", aFileName);
}
uint offsetToFirstIFD = ReadUI4();
mFile.Seek(offsetToFirstIFD, SeekOrigin.Begin);
List <ImageFileDirectory> ifds = new List <ImageFileDirectory>();
while (true)
{
ImageFileDirectory ifd = new ImageFileDirectory(this);
ifds.Add(ifd);
uint offsetToNext = ReadUI4();
if (offsetToNext == 0)
{
break;
}
Seek(offsetToNext, System.IO.SeekOrigin.Begin);
}
IFDSubIFDs sub = ifds[0].GetEntry <IFDSubIFDs>();
mWidth = (int)sub.Value[0].GetEntry <IFDImageWidth>().Value;
mHeight = (int)sub.Value[0].GetEntry <IFDImageLength>().Value;
IFDExif exif = ifds[0].GetEntry <IFDExif>();
mISO = exif.GetEntry <ExifEntry.ExifISOSpeedRatings>().Value;
mBitDepth = sub.Value[0].GetEntry <IFDBitsPerSample>().Value;
mBayerPattern = sub.Value[0].GetEntry <IFDCFAPattern>().Value;
mBayerWidth = sub.Value[0].GetEntry <IFDCFARepeatPatternDim>().Value[0];
mBayerHeight = sub.Value[0].GetEntry <IFDCFARepeatPatternDim>().Value[1];
mWhiteLevel = sub.Value[0].GetEntry <IFDDNGWhiteLevel>();
mBlackLevel = sub.Value[0].GetEntry <IFDDNGBlackLevel>();
mLinearizationTable = sub.Value[0].GetEntry <IFDDNGLinearizationTable>();
mMinVal = new float[3];
mMinVal[0] = (float)mBlackLevel.Value[0].Value;
mMinVal[1] = (float)mBlackLevel.Value[mBlackLevel.Value.Length > 1 ? 1 : 0].Value;
mMinVal[2] = (float)mBlackLevel.Value[mBlackLevel.Value.Length > 3 ? 3 : 0].Value;
mMaxVal = new float[3];
mMaxVal[0] = (float)mWhiteLevel.Value[0];
mMaxVal[1] = (float)mWhiteLevel.Value[mWhiteLevel.Value.Length > 1 ? 1 : 0];
mMaxVal[2] = (float)mWhiteLevel.Value[mWhiteLevel.Value.Length > 3 ? 3 : 0];
mAsShotNeutral = ifds[0].GetEntry <IFDDNGAsShotNeutral>();
}
public DNGFile(string aFileName)
: base(aFileName)
{
byte a = mFileReader.ReadByte();
byte b = mFileReader.ReadByte();
bool fileIsLittleEndian;
if (a == b && b == 'I')
{
fileIsLittleEndian = true;
}
else
if (a == b && b == 'M')
{
fileIsLittleEndian = false;
}
else
{
throw new FileLoadException("Could not determine file endianess. Is this a proper TIFF/PEF file?", aFileName);
}
mEndianSwap = fileIsLittleEndian != BitConverter.IsLittleEndian;
ushort magicNumber = ReadUI2();
if (magicNumber != 42)
{
throw new FileLoadException("This is not a valid TIFF/PEF file: Magic number is not 42.", aFileName);
}
uint offsetToFirstIFD = ReadUI4();
mFile.Seek(offsetToFirstIFD, SeekOrigin.Begin);
List <ImageFileDirectory> ifds = new List <ImageFileDirectory>();
while (true)
{
ImageFileDirectory ifd = new ImageFileDirectory(this);
ifds.Add(ifd);
uint offsetToNext = ReadUI4();
if (offsetToNext == 0)
{
break;
}
Seek(offsetToNext, System.IO.SeekOrigin.Begin);
}
IFDDNGVersion version = ifds[0].GetEntry <IFDDNGVersion>();
isDNGVersionLarge = version == null;
if (version != null)
{
isDNGVersionLarge = version.Value[1] > 1;
}
IFDSubIFDs sub = ifds[0].GetEntry <IFDSubIFDs>();
mWidth = (int)sub.Value[0].GetEntry <IFDImageWidth>().Value;
mHeight = (int)sub.Value[0].GetEntry <IFDImageLength>().Value;
IFDExif exif = ifds[0].GetEntry <IFDExif>();
mISO = exif.GetEntry <ExifEntry.ExifISOSpeedRatings>().Value;
mBitDepth = sub.Value[0].GetEntry <IFDBitsPerSample>().Value;
mBayerPattern = sub.Value[0].GetEntry <IFDCFAPattern>().Value;
mBayerWidth = sub.Value[0].GetEntry <IFDCFARepeatPatternDim>().Value[0];
mBayerHeight = sub.Value[0].GetEntry <IFDCFARepeatPatternDim>().Value[1];
mWhiteLevel = sub.Value[0].GetEntry <IFDDNGWhiteLevel>();
mBlackLevel = sub.Value[0].GetEntry <IFDDNGBlackLevel>();
mAsShotNeutral = sub.Value[0].GetEntry <IFDDNGAsShotNeutral>();
mLinearizationTable = sub.Value[0].GetEntry <IFDDNGLinearizationTable>();
mMinVal = new float[3];
mMinVal[0] = (float)mBlackLevel.Value[0].Value;
mMinVal[1] = (float)mBlackLevel.Value[mBlackLevel.Value.Length > 1 ? 1 : 0].Value;
mMinVal[2] = (float)mBlackLevel.Value[mBlackLevel.Value.Length > 3 ? 3 : 0].Value;
mMaxVal = new float[3];
mMaxVal[0] = (float)mWhiteLevel.Value[0];
mMaxVal[1] = (float)mWhiteLevel.Value[mWhiteLevel.Value.Length > 1 ? 1 : 0];
mMaxVal[2] = (float)mWhiteLevel.Value[mWhiteLevel.Value.Length > 3 ? 3 : 0];
int tileWidth = (int)sub.Value[0].GetEntry <IFDTileWidth>().Value;
int tileHeight = (int)sub.Value[0].GetEntry <IFDTileLength>().Value;
uint[] offsets = sub.Value[0].GetEntry <IFDTileOffsets>().Value;
uint[] byteCounts = sub.Value[0].GetEntry <IFDTileByteCounts>().Value;
mRawImage = new ushort[mHeight, mWidth];
int row = 0;
int col = 0;
for (int tile = 0; tile < offsets.Length; tile++)
{
byte[] data;
Seek(offsets[tile], SeekOrigin.Begin);
data = mFileReader.ReadBytes((int)byteCounts[tile]);
MemoryStream ms = new MemoryStream(data);
ms.Seek(0, SeekOrigin.Begin);
jhead jh = new jhead();
int ret = ljpeg_start(jh, 0, ms);
int jrow, jcol;
if (ret > 0 && jh != null)
{
int jwide = jh.wide;
jwide *= jh.clrs;
unsafe
{
if (jh.algo == 0xc3) //lossless JPEG
{
for (jrow = 0; jrow < jh.high; jrow++)
{
fixed(ushort *ptr = jh.row)
{
jh.rowPtr = ptr;
ushort *rp = ljpeg_row(jrow, jh, ms);
for (jcol = 0; jcol < jwide; jcol++)
{
if (jcol + col < mWidth && jrow + row < mHeight)
{
if (mLinearizationTable != null)
{
mRawImage[row + jrow, col + jcol] = mLinearizationTable.Value[rp[jcol] < mLinearizationTable.Value.Length ? rp[jcol] : mLinearizationTable.Value.Length - 1];
}
else
{
mRawImage[row + jrow, col + jcol] = rp[jcol];
}
}
}
jh.rowPtr = null;
}
}
}
}
}
col += tileWidth;
if (col > mWidth)
{
col = 0;
row += tileHeight;
}
}
}
private ImageFileDirectory SetMembers()
{
ImageFileDirectory rawIFD = null;
//find the IFD with the RAW Bayer image
for (int i = 0; i < mIfds.Count; i++)
{
//well, it should actually be somewhere in IFD0...
if (mIfds[i].GetEntry <IFDPhotometricInterpretation>() != null)
{
if (mIfds[i].GetEntry <IFDPhotometricInterpretation>().Value ==
IFDPhotometricInterpretation.PhotometricInterpretation.CFA)
{
rawIFD = mIfds[i];
break;
}
}
}
//no root IFD seems to contain RAW bayer, search for Sub-IFDs
if (rawIFD == null)
{
//find the IFD with the RAW Bayer image
for (int i = 0; i < mIfds.Count; i++)
{
IFDSubIFDs subIFD = mIfds[i].GetEntry <IFDSubIFDs>();
if (subIFD == null)
{
continue;
}
for (int j = 0; j < subIFD.Value.Count; j++)
{
if (subIFD.Value[j].GetEntry <IFDPhotometricInterpretation>().Value ==
IFDPhotometricInterpretation.PhotometricInterpretation.CFA)
{
rawIFD = subIFD.Value[j];
break;
}
}
}
}
if (rawIFD == null)
{
throw new ArgumentException("Can't find IFD with Bayer RAW image.");
}
mLinearizationTable = rawIFD.GetEntry <IFDDNGLinearizationTable>();
mWidth = (int)rawIFD.GetEntry <IFDImageWidth>().Value;
mHeight = (int)rawIFD.GetEntry <IFDImageLength>().Value;
if (mIfds[0].GetEntry <IFDDateTime>() != null)
{
mRecordingDate = mIfds[0].GetEntry <IFDDateTime>().Value;
}
//in case of Pentax this will have succes:
IFDDNGPrivateData privateData = mIfds[0].GetEntry <IFDDNGPrivateData>();
if (privateData != null)
{
MNLevelInfo levelInfo = privateData.PentaxMakerNotes.GetEntry <MNLevelInfo>();
if (levelInfo != null)
{
mRollAngle = levelInfo.Value.RollAngle;
mRollAnglePresent = true;
}
}
IFDExif exif = mIfds[0].GetEntry <IFDExif>();
if (exif != null)
{
mISO = exif.GetEntry <ExifISOSpeedRatings>().Value;
mExposureTime = exif.GetEntry <ExifExposureTime>().Value;
mRecordingDate = (exif.GetEntry <ExifDateTimeDigitized>()?.Value).GetValueOrDefault(mRecordingDate);
}
else if (rawIFD.GetEntry <IFDISOSpeedRatings>() != null)
{
mISO = rawIFD.GetEntry <IFDISOSpeedRatings>().Value;
//very likely that exposure time is also present
mExposureTime = rawIFD.GetEntry <IFDExposureTime>().Value;
}
else if (mIfds[0].GetEntry <IFDISOSpeedRatings>() != null)
{
mISO = mIfds[0].GetEntry <IFDISOSpeedRatings>().Value;
//very likely that exposure time is also present
mExposureTime = mIfds[0].GetEntry <IFDExposureTime>().Value;
}
mBitDepth = rawIFD.GetEntry <IFDBitsPerSample>().Value[0];
int bayerWidth = rawIFD.GetEntry <IFDCFARepeatPatternDim>().Value[0];
int bayerHeight = rawIFD.GetEntry <IFDCFARepeatPatternDim>().Value[1];
if (bayerHeight != 2 || bayerWidth != 2)
{
throw new ArgumentException("This file has a bayer pattern size different than 2x2. Can't decode that.");
}
ExifCFAPattern.BayerColor[] bayer = rawIFD.GetEntry <IFDCFAPattern>().Value;
mBayerPattern = new BayerColor[bayer.Length];
for (int i = 0; i < bayer.Length; i++)
{
mBayerPattern[i] = (BayerColor)(int)bayer[i];
}
IFDDNGCFAPlaneColor planeColor = rawIFD.GetEntry <IFDDNGCFAPlaneColor>();
int[] planeColorHelper = new int[] { 0, 1, 2 };
if (planeColor != null) //did it ever differ from 0,1,2?
{
//0 = red, 1 = gree, 2 = blue.
//The debayer algo creates images with plane order red/green/blue.
//If this order differs, we need to re-order the planes in order to
//have the color matrices correct.
//reset colorTwist matrix:
mColorTwist = new float[3, 4];
if (planeColor.Value.Length > 3 || planeColor.Value.Length < 3)
{
throw new ArgumentException("This image doesn't contain three color planes.");
}
for (int i = 0; i < planeColor.Value.Length; i++)
{
int color = planeColor.Value[i];
planeColorHelper[i] = color;
if (color > 2)
{
throw new ArgumentException("This image contains colors different than red/green/blue.");
}
mColorTwist[color, i] = 1;
if (color != i)
{
mColorTwistIsIdentity = false;
}
}
}
mColorSpec = new DNGColorSpec(3, mIfds[0], rawIFD);
IFDDNGWhiteLevel whiteLevel = rawIFD.GetEntry <IFDDNGWhiteLevel>();
IFDDNGBlackLevel blackLevel = rawIFD.GetEntry <IFDDNGBlackLevel>();
mBlackLevel = new float[3];
if (blackLevel != null)
{
//only one value for all colors
if (blackLevel.Value.Length == 1)
{
mBlackLevel[0] = (float)blackLevel.Value[0].Value;
mBlackLevel[1] = (float)blackLevel.Value[0].Value;
mBlackLevel[2] = (float)blackLevel.Value[0].Value;
}
//values per color channel
if (blackLevel.Value.Length == 3)
{
mBlackLevel[planeColorHelper[0]] = (float)blackLevel.Value[0].Value;
mBlackLevel[planeColorHelper[1]] = (float)blackLevel.Value[1].Value;
mBlackLevel[planeColorHelper[2]] = (float)blackLevel.Value[2].Value;
}
//values per color bayer pattern
if (blackLevel.Value.Length == 4)
{
//red
int indexR = -1;
for (int i = 0; i < mBayerPattern.Length; i++)
{
if (mBayerPattern[i] == BayerColor.Red)
{
indexR = i;
break;
}
}
mBlackLevel[0] = (float)blackLevel.Value[indexR].Value;
//blue
int indexB = -1;
for (int i = 0; i < mBayerPattern.Length; i++)
{
if (mBayerPattern[i] == BayerColor.Blue)
{
indexB = i;
break;
}
}
mBlackLevel[2] = (float)blackLevel.Value[indexB].Value;
//green, the two remaining indices
int indexG1 = -1, indexG2 = -1;
for (int i = 0; i < mBayerPattern.Length; i++)
{
if (mBayerPattern[i] == BayerColor.Green && indexG1 == -1)
{
indexG1 = i;
}
if (mBayerPattern[i] == BayerColor.Green && indexG1 != -1)
{
indexG2 = i;
}
}
float g1 = (float)blackLevel.Value[indexG1].Value;
float g2 = (float)blackLevel.Value[indexG2].Value;
mBlackLevel[1] = Math.Max(g1, g2); //well, one could distinguish the two greens, but what for?
}
}
mWhiteLevel = new float[3];
mWhiteLevel[0] = (float)whiteLevel.Value[0];
mWhiteLevel[1] = (float)whiteLevel.Value[0];
mWhiteLevel[2] = (float)whiteLevel.Value[0];
//subtract black level from white level
mWhiteLevel[0] -= mBlackLevel[0];
mWhiteLevel[1] -= mBlackLevel[1];
mWhiteLevel[2] -= mBlackLevel[2];
//get white balance from color spec
DNGVector wb = mColorSpec.CameraWhite;
mWhiteBalance = new float[3];
mWhiteBalance[planeColorHelper[0]] = 1.0f / (float)wb[0];
mWhiteBalance[planeColorHelper[1]] = 1.0f / (float)wb[1];
mWhiteBalance[planeColorHelper[2]] = 1.0f / (float)wb[2];
//look for orientation tag. If RAW ifd has the tag, choose that one
if (rawIFD.GetEntry <IFDOrientation>() != null)
{
mOrientation = new DNGOrientation(rawIFD.GetEntry <IFDOrientation>().Value);
}
else if (mIfds[0].GetEntry <IFDOrientation>() != null)
{
mOrientation = new DNGOrientation(mIfds[0].GetEntry <IFDOrientation>().Value);
}
else
{
//no tag found, use default
mOrientation = new DNGOrientation(DNGOrientation.Orientation.Normal);
}
//default Values:
int cropLeft = 0;
int cropTop = 0;
int croppedWidth = mWidth;
int croppedHeight = mHeight;
IFDDNGActiveArea activeArea = rawIFD.GetEntry <IFDDNGActiveArea>();
//if active area is defined:
if (activeArea != null)
{
int top, left, bottom, right;
top = (int)activeArea.Value[0];
left = (int)activeArea.Value[1];
bottom = (int)activeArea.Value[2];
right = (int)activeArea.Value[3];
cropLeft += left;
cropTop += top;
croppedWidth = right - left;
croppedHeight = bottom - top;
//CFA pattern is defined on active area. If top/left is uneven we need to shift the CFA pattern accordingly
if (top % 2 != 0)
{
BayerColor bayer0 = BayerPattern[0];
BayerColor bayer1 = BayerPattern[1];
BayerPattern[0] = BayerPattern[2];
BayerPattern[1] = BayerPattern[3];
BayerPattern[2] = bayer0;
BayerPattern[3] = bayer1;
}
if (left % 2 != 0)
{
BayerColor bayer0 = BayerPattern[0];
BayerColor bayer2 = BayerPattern[2];
BayerPattern[0] = BayerPattern[1];
BayerPattern[2] = BayerPattern[3];
BayerPattern[1] = bayer0;
BayerPattern[3] = bayer2;
}
}
IFDDNGDefaultCropOrigin cropOrigin = rawIFD.GetEntry <IFDDNGDefaultCropOrigin>();
IFDDNGDefaultCropSize cropSize = rawIFD.GetEntry <IFDDNGDefaultCropSize>();
if (cropOrigin != null && cropSize != null)
{
int top, left, width, height;
left = (int)(cropOrigin.Value[0].Value);
top = (int)(cropOrigin.Value[0].Value);
width = (int)(cropSize.Value[0].Value);
height = (int)(cropSize.Value[0].Value);
cropLeft += left;
cropTop += top;
croppedWidth = width;
croppedHeight = height;
}
//we always crop at least two pixels because of our algos...
mCropLeft = Math.Max(2, cropLeft);
mCropTop = Math.Max(2, cropTop);
mCroppedWidth = croppedWidth - Math.Max(0, (cropLeft + croppedWidth) - (mWidth - 2));
mCroppedHeight = croppedHeight - Math.Max(0, (cropTop + croppedHeight) - (mHeight - 2));
IFDDNGNoiseProfile noise = rawIFD.GetEntry <IFDDNGNoiseProfile>();
if (noise == null)
{
noise = mIfds[0].GetEntry <IFDDNGNoiseProfile>();
}
if (noise != null)
{
//if noise level is given for all channels,
//take the green one as it is usually scalled to one
if (noise.Value.Length > 2)
{
mNoiseModelAlpha = (float)noise.Value[planeColorHelper[1] * 2];
mNoiseModelBeta = (float)noise.Value[planeColorHelper[1] * 2 + 1];
}
else
{
mNoiseModelAlpha = (float)noise.Value[0];
mNoiseModelBeta = (float)noise.Value[1];
}
}
mMake = mIfds[0].GetEntry <IFDMake>().Value;
mUniqueModelName = mIfds[0].GetEntry <IFDDNGUniqueCameraModel>().Value;
return(rawIFD);
}
public DNGFile(string aFileName)
: base(aFileName)
{
IFDDNGVersion version = mIfds[0].GetEntry <IFDDNGVersion>();
isDNGVersionLarge = version == null;
if (version != null)
{
isDNGVersionLarge = version.Value[1] > 1;
}
ImageFileDirectory rawIFD = SetMembers();
//try to read additional noise models
try
{
ExtraCameraProfiles profiles = ExtraCameraProfiles.Load("ExtraCameraProfiles.xml");
string make = mIfds[0].GetEntry <IFDMake>()?.Value;
string uniqueModel = mIfds[0].GetEntry <IFDDNGUniqueCameraModel>()?.Value;
ExtraCameraProfile profile = profiles.GetProfile(make, uniqueModel);
double a, b;
(a, b) = profile.NoiseModel.GetValue(mISO);
if (a != 0.0)
{
mNoiseModelAlpha = (float)a;
mNoiseModelBeta = (float)b;
}
}
catch (Exception)
{
}
//get non-global blacklevels
ushort[] blackLevelV = new ushort[mHeight];
ushort[] blackLevelH = new ushort[mWidth];
int maxBlackLevel = 0;
IFDDNGBlackLevelDeltaV deltaV = rawIFD.GetEntry <IFDDNGBlackLevelDeltaV>();
IFDDNGActiveArea activeArea = rawIFD.GetEntry <IFDDNGActiveArea>();
int blackOffsetH = 0;
int blackOffsetV = 0;
int borderBottom = 0;
int borderRight = 0;
if (activeArea != null)
{
blackOffsetV = (int)activeArea.Value[0];
blackOffsetH = (int)activeArea.Value[1];
borderBottom = mHeight - (int)activeArea.Value[2];
borderRight = mWidth - (int)activeArea.Value[3];
}
if (deltaV != null)
{
if (deltaV.Value.Length + blackOffsetV + borderBottom != mHeight)
{
throw new Exception("Count in IFDDNGBlackLevelDeltaV doesn't fit image height");
}
for (int i = 0; i < deltaV.Value.Length; i++)
{
blackLevelV[blackOffsetV + i] = (ushort)deltaV.Value[i].Value;
}
}
IFDDNGBlackLevelDeltaH deltaH = rawIFD.GetEntry <IFDDNGBlackLevelDeltaH>();
if (deltaH != null)
{
if (deltaH.Value.Length + blackOffsetH + borderRight != mWidth)
{
throw new Exception("Count in IFDDNGBlackLevelDeltaH doesn't fit image width");
}
for (int i = 0; i < deltaH.Value.Length; i++)
{
blackLevelH[blackOffsetH + i] = (ushort)deltaH.Value[i].Value;
}
}
//read actual image data
//data stored in tiles:
if (rawIFD.GetEntry <IFDTileWidth>() != null)
{
int tileWidth = (int)rawIFD.GetEntry <IFDTileWidth>().Value;
int tileHeight = (int)rawIFD.GetEntry <IFDTileLength>().Value;
uint[] offsets = rawIFD.GetEntry <IFDTileOffsets>().Value;
uint[] byteCounts = rawIFD.GetEntry <IFDTileByteCounts>().Value;
mRawImage = new ushort[mHeight, mWidth];
int row = 0;
int col = 0;
if (rawIFD.GetEntry <IFDCompression>().Value == IFDCompression.Compression.LosslessJPEG)
{
for (int tile = 0; tile < offsets.Length; tile++)
{
byte[] data;
Seek(offsets[tile], SeekOrigin.Begin);
data = mFileReader.ReadBytes((int)byteCounts[tile]);
MemoryStream ms = new MemoryStream(data);
ms.Seek(0, SeekOrigin.Begin);
jhead jh = new jhead();
int ret = ljpeg_start(jh, 0, ms);
int jrow, jcol;
if (ret > 0 && jh != null)
{
int jwide = jh.wide;
jwide *= jh.clrs;
unsafe
{
if (jh.algo == 0xc3) //lossless JPEG
{
for (jrow = 0; jrow < jh.high; jrow++)
{
fixed(ushort *ptr = jh.row)
{
jh.rowPtr = ptr;
ushort *rp = ljpeg_row(jrow, jh, ms);
for (jcol = 0; jcol < jwide; jcol++)
{
if (jcol + col < mWidth && jrow + row < mHeight)
{
int black = blackLevelH[jcol + col];
black += blackLevelV[jrow + row];
maxBlackLevel = Math.Max(maxBlackLevel, black);
if (mLinearizationTable != null)
{
mRawImage[row + jrow, col + jcol] = (ushort)Math.Max(0, (int)(mLinearizationTable.Value[rp[jcol] < mLinearizationTable.Value.Length ? rp[jcol] : mLinearizationTable.Value.Length - 1]) - black);
}
else
{
mRawImage[row + jrow, col + jcol] = (ushort)Math.Max(0, (int)(rp[jcol] - black));
}
}
}
jh.rowPtr = null;
}
}
}
}
}
col += tileWidth;
if (col >= mWidth)
{
col = 0;
row += tileHeight;
}
}
}
else
{
throw new ArgumentException("I don't know how to read that file :(");
}
}
//data stored in strips:
else if (rawIFD.GetEntry <IFDStripOffsets>() != null)
{
uint[] offsets = rawIFD.GetEntry <IFDStripOffsets>().Value;
uint[] byteCounts = rawIFD.GetEntry <IFDStripByteCounts>().Value;
uint rowsPerStrip = rawIFD.GetEntry <IFDRowsPerStrip>().Value;
if (rawIFD.GetEntry <IFDCompression>().Value == IFDCompression.Compression.LosslessJPEG)
{
mRawImage = new ushort[mHeight, mWidth];
for (int strip = 0; strip < offsets.Length; strip++)
{
byte[] data;
Seek(offsets[strip], SeekOrigin.Begin);
data = mFileReader.ReadBytes((int)byteCounts[strip]);
MemoryStream ms = new MemoryStream(data);
ms.Seek(0, SeekOrigin.Begin);
jhead jh = new jhead();
int ret = ljpeg_start(jh, 0, ms);
int jrow, jcol;
if (ret > 0 && jh != null)
{
int jwide = jh.wide;
jwide *= jh.clrs;
unsafe
{
if (jh.algo == 0xc3) //lossless JPEG
{
for (jrow = 0; jrow < jh.high; jrow++)
{
fixed(ushort *ptr = jh.row)
{
jh.rowPtr = ptr;
ushort *rp = ljpeg_row(jrow, jh, ms);
for (jcol = 0; jcol < jwide; jcol++)
{
if (jcol < mWidth && jrow + (strip * rowsPerStrip) < mHeight)
{
int black = blackLevelH[jcol];
black += blackLevelV[(strip * rowsPerStrip) + jrow];
maxBlackLevel = Math.Max(maxBlackLevel, black);
if (mLinearizationTable != null)
{
mRawImage[(strip * rowsPerStrip) + jrow, jcol] = (ushort)Math.Max(0, (int)((mLinearizationTable.Value[rp[jcol] < mLinearizationTable.Value.Length ? rp[jcol] : mLinearizationTable.Value.Length - 1]) - black));
}
else
{
mRawImage[(strip * rowsPerStrip) + jrow, jcol] = (ushort)Math.Max(0, (int)(rp[jcol] - black));
}
}
}
jh.rowPtr = null;
}
}
}
}
}
}
}
else if (rawIFD.GetEntry <IFDCompression>().Value == IFDCompression.Compression.NoCompression)
{
mRawImage = new ushort[mHeight, mWidth];
if (mBitDepth == 16)
{
for (int strip = 0; strip < offsets.Length; strip++)
{
byte[] data;
Seek(offsets[strip], SeekOrigin.Begin);
data = mFileReader.ReadBytes((int)byteCounts[strip]);
unsafe
{
fixed(byte *ptr = data)
{
ushort *usptr = (ushort *)ptr;
for (int pixel = 0; pixel < data.Length / 2; pixel++)
{
int row = strip * (int)rowsPerStrip;
int col = pixel;
if (col >= mWidth)
{
row += pixel / mWidth;
col = pixel % mWidth;
}
int black = blackLevelH[col];
black += blackLevelV[row];
maxBlackLevel = Math.Max(maxBlackLevel, black);
if (mLinearizationTable != null)
{
mRawImage[row, col] = (ushort)Math.Max(0, (int)(mLinearizationTable.Value[usptr[pixel] < mLinearizationTable.Value.Length ? usptr[pixel] : mLinearizationTable.Value.Length - 1]) - black);
}
else
{
mRawImage[row, col] = (ushort)Math.Max(0, (int)(usptr[pixel]) - black);
}
}
}
}
}
}
else if (mBitDepth < 16)
{
for (int strip = 0; strip < offsets.Length; strip++)
{
byte[] data;
Seek(offsets[strip], SeekOrigin.Begin);
data = mFileReader.ReadBytes((int)byteCounts[strip]);
uint pos = 0;
int offset = 0;
for (int line = 0; line < rowsPerStrip; line++)
{
for (int pixel = 0; pixel < mWidth; pixel++)
{
int row = strip * (int)rowsPerStrip + line;
int col = pixel;
uint val = data[pos];
while (offset < mBitDepth)
{
val = data[pos];
bitbuf = (bitbuf << 8) + val;
offset += 8;
pos++;
}
val = bitbuf << (32 - offset) >> (32 - mBitDepth);
offset -= mBitDepth;
int black = blackLevelH[col];
black += blackLevelV[row];
maxBlackLevel = Math.Max(maxBlackLevel, black);
if (mLinearizationTable != null)
{
mRawImage[row, col] = (ushort)Math.Max(0, (int)(mLinearizationTable.Value[val < mLinearizationTable.Value.Length ? (ushort)(val) : mLinearizationTable.Value.Length - 1]) - black);
}
else
{
mRawImage[row, col] = (ushort)Math.Max(0, (int)(val) - black);
}
}
}
}
}
}
else
{
throw new ArgumentException("I don't know how to read that file :(");
}
}
//close the file
Close();
WhiteLevel[0] -= maxBlackLevel;
WhiteLevel[1] -= maxBlackLevel;
WhiteLevel[2] -= maxBlackLevel;
}