public GPSRational(byte[] bytes)
{
byte[] h = new byte[8]; byte[] m = new byte[8]; byte[] s = new byte[8];
Array.Copy(bytes, 0, h, 0, 8); Array.Copy(bytes, 8, m, 0, 8); Array.Copy(bytes, 16, s, 0, 8);
_hours = new Rational(h);
_minutes = new Rational(m);
_seconds = new Rational(s);
}
private static string ReadTag(Image image, int propId)
{
string value = string.Empty;
PropertyItem pitem;
try
{
pitem = image.GetPropertyItem(propId);
}
catch (Exception ex)
{
throw ex;
}
switch (pitem.Type)
{
case 0x1:
if (pitem.Value.Length == 4)
{
value = "Version " + pitem.Value[0].ToString() + "." + pitem.Value[1].ToString();
}
else if (pitem.Id == 0x5 && pitem.Value[0] == 0)
{
value = "Sea level";
}
else
{
value = pitem.Value[0].ToString();
}
break;
case 0x2:
value = Ascii.GetString(pitem.Value).Trim('\0');
if (pitem.Id == 0x1 || pitem.Id == 0x13)
{
if (value == "N")
{
value = "North latitude";
}
else if (value == "S")
{
value = "South latitude";
}
else
{
value = "reserved";
}
}
if (pitem.Id == 0x3 || pitem.Id == 0x15)
{
if (value == "E")
{
value = "East longitude";
}
else if (value == "W")
{
value = "West longitude";
}
else
{
value = "reserved";
}
}
if (pitem.Id == 0x9)
{
if (value == "A")
{
value = "Measurement in progress";
}
else if (value == "V")
{
value = "Measurement Interoperability";
}
else
{
value = "reserved";
}
}
if (pitem.Id == 0xA)
{
if (value == "2")
{
value = "2-dimensional measurement";
}
else if (value == "3")
{
value = "3-dimensional measurement";
}
else
{
value = "reserved";
}
}
if (pitem.Id == 0xC || pitem.Id == 0x19)
{
if (value == "K")
{
value = "Kilometers per hour";
}
else if (value == "M")
{
value = "Miles per hour";
}
else if (value == "N")
{
value = "Knots";
}
else
{
value = "reserved";
}
}
if (pitem.Id == 0xE || pitem.Id == 0x10 || pitem.Id == 0x17)
{
if (value == "T")
{
value = "True direction";
}
else if (value == "M")
{
value = "Magnetic direction";
}
else
{
value = "reserved";
}
}
break;
case 0x3:
{
#region 3 = SHORT (16-bit unsigned int)
UInt16 uintval = BitConverter.ToUInt16(pitem.Value, 0);
// orientation // lookup table
switch (pitem.Id)
{
case 0x8827: // ISO speed rating
value = "ISO-" + uintval.ToString();
break;
case 0xA217: // sensing method
{
switch (uintval)
{
case 1: value = "Not defined"; break;
case 2: value = "One-chip color area sensor"; break;
case 3: value = "Two-chip color area sensor"; break;
case 4: value = "Three-chip color area sensor"; break;
case 5: value = "Color sequential area sensor"; break;
case 7: value = "Trilinear sensor"; break;
case 8: value = "Color sequential linear sensor"; break;
default: value = " reserved"; break;
}
}
break;
case 0x8822: // 曝光程序
switch (uintval)
{
case 0: value = "未定义"; break;
case 1: value = "手工"; break;
case 2: value = "标准程序"; break;
case 3: value = "光圈优先"; break;
case 4: value = "快门优先"; break;
case 5: value = "景深优先"; break;
case 6: value = "运动模式"; break;
case 7: value = "肖像模式"; break;
case 8: value = "风景模式"; break;
default: value = "保留"; break;
}
break;
case 0x9207: // 测光模式
switch (uintval)
{
case 0: value = "未知"; break;
case 1: value = "平均"; break;
case 2: value = "中央重点平均"; break;
case 3: value = "点测"; break;
case 4: value = "多点"; break;
case 5: value = "评估"; break;
case 6: value = "局部"; break;
case 255: value = "其他"; break;
default: value = "保留"; break;
}
break;
case 0x9208: // Light source
{
switch (uintval)
{
case 0: value = "unknown"; break;
case 1: value = "Daylight"; break;
case 2: value = "Fluorescent"; break;
case 3: value = "Tungsten (incandescent light)"; break;
case 4: value = "Flash"; break;
case 9: value = "Fine weather"; break;
case 10: value = "Cloudy weather"; break;
case 11: value = "Shade"; break;
case 12: value = "Daylight fluorescent (D 5700 – 7100K)"; break;
case 13: value = "Day white fluorescent (N 4600 – 5400K)"; break;
case 14: value = "Cool white fluorescent (W 3900 – 4500K)"; break;
case 15: value = "White fluorescent (WW 3200 – 3700K)"; break;
case 17: value = "Standard light A"; break;
case 18: value = "Standard light B"; break;
case 19: value = "Standard light C"; break;
case 20: value = "D55"; break;
case 21: value = "D65"; break;
case 22: value = "D75"; break;
case 23: value = "D50"; break;
case 24: value = "ISO studio tungsten"; break;
case 255: value = "ISO studio tungsten"; break;
default: value = "other light source"; break;
}
}
break;
case 0x9209: // Flash
{
switch (uintval)
{
case 0x0: value = "关闭"; break;
case 0x1: value = "Flash fired"; break;
case 0x5: value = "Strobe return light not detected"; break;
case 0x7: value = "Strobe return light detected"; break;
case 0x9: value = "Flash fired, compulsory flash mode"; break;
case 0xD: value = "Flash fired, compulsory flash mode, return light not detected"; break;
case 0xF: value = "Flash fired, compulsory flash mode, return light detected"; break;
case 0x10: value = "Flash did not fire, compulsory flash mode"; break;
case 0x18: value = "Flash did not fire, auto mode"; break;
case 0x19: value = "Flash fired, auto mode"; break;
case 0x1D: value = "Flash fired, auto mode, return light not detected"; break;
case 0x1F: value = "Flash fired, auto mode, return light detected"; break;
case 0x20: value = "No flash function"; break;
case 0x41: value = "Flash fired, red-eye reduction mode"; break;
case 0x45: value = "Flash fired, red-eye reduction mode, return light not detected"; break;
case 0x47: value = "Flash fired, red-eye reduction mode, return light detected"; break;
case 0x49: value = "Flash fired, compulsory flash mode, red-eye reduction mode"; break;
case 0x4D: value = "Flash fired, compulsory flash mode, red-eye reduction mode, return light not detected"; break;
case 0x4F: value = "Flash fired, compulsory flash mode, red-eye reduction mode, return light detected"; break;
case 0x59: value = "Flash fired, auto mode, red-eye reduction mode"; break;
case 0x5D: value = "Flash fired, auto mode, return light not detected, red-eye reduction mode"; break;
case 0x5F: value = "Flash fired, auto mode, return light detected, red-eye reduction mode"; break;
default: value = "reserved"; break;
}
}
break;
case 0x0128: //ResolutionUnit
{
switch (uintval)
{
case 2: value = "Inch"; break;
case 3: value = "Centimeter"; break;
default: value = "No Unit"; break;
}
}
break;
case 0xA409: // Saturation
{
switch (uintval)
{
case 0: value = "Normal"; break;
case 1: value = "Low saturation"; break;
case 2: value = "High saturation"; break;
default: value = "Reserved"; break;
}
}
break;
case 0xA40A: // Sharpness
{
switch (uintval)
{
case 0: value = "Normal"; break;
case 1: value = "Soft"; break;
case 2: value = "Hard"; break;
default: value = "Reserved"; break;
}
}
break;
case 0xA408: // Contrast
{
switch (uintval)
{
case 0: value = "Normal"; break;
case 1: value = "Soft"; break;
case 2: value = "Hard"; break;
default: value = "Reserved"; break;
}
}
break;
case 0x103: // Compression
{
switch (uintval)
{
case 1: value = "Uncompressed"; break;
case 6: value = "JPEG compression (thumbnails only)"; break;
default: value = "Reserved"; break;
}
}
break;
case 0x106: // PhotometricInterpretation
{
switch (uintval)
{
case 2: value = "RGB"; break;
case 6: value = "YCbCr"; break;
default: value = "Reserved"; break;
}
}
break;
case 0x112: // Orientation
{
switch (uintval)
{
case 1: value = "The 0th row is at the visual top of the image, and the 0th column is the visual left-hand side."; break;
case 2: value = "The 0th row is at the visual top of the image, and the 0th column is the visual right-hand side."; break;
case 3: value = "The 0th row is at the visual bottom of the image, and the 0th column is the visual right-hand side."; break;
case 4: value = "The 0th row is at the visual bottom of the image, and the 0th column is the visual left-hand side."; break;
case 5: value = "The 0th row is the visual left-hand side of the image, and the 0th column is the visual top."; break;
case 6: value = "The 0th row is the visual right-hand side of the image, and the 0th column is the visual top."; break;
case 7: value = "The 0th row is the visual right-hand side of the image, and the 0th column is the visual bottom."; break;
case 8: value = "The 0th row is the visual left-hand side of the image, and the 0th column is the visual bottom."; break;
default: value = "Reserved"; break;
}
}
break;
case 0x213: // YCbCrPositioning
{
switch (uintval)
{
case 1: value = "centered"; break;
case 6: value = "co-sited"; break;
default: value = "Reserved"; break;
}
}
break;
case 0xA001: // ColorSpace
{
switch (uintval)
{
case 1: value = "sRGB"; break;
case 0xFFFF: value = "Uncalibrated"; break;
default: value = "Reserved"; break;
}
}
break;
case 0xA401: // CustomRendered
{
switch (uintval)
{
case 0: value = "Normal process"; break;
case 1: value = "Custom process"; break;
default: value = "Reserved"; break;
}
}
break;
case 0xA402: // ExposureMode
{
switch (uintval)
{
case 0: value = "Auto exposure"; break;
case 1: value = "Manual exposure"; break;
case 2: value = "Auto bracket"; break;
default: value = "Reserved"; break;
}
}
break;
case 0xA403: // WhiteBalance
{
switch (uintval)
{
case 0: value = "Auto white balance"; break;
case 1: value = "Manual white balance"; break;
default: value = "Reserved"; break;
}
}
break;
case 0xA406: // SceneCaptureType
{
switch (uintval)
{
case 0: value = "Standard"; break;
case 1: value = "Landscape"; break;
case 2: value = "Portrait"; break;
case 3: value = "Night scene"; break;
default: value = "Reserved"; break;
}
}
break;
case 0xA40C: // SubjectDistanceRange
{
switch (uintval)
{
case 0: value = "unknown"; break;
case 1: value = "Macro"; break;
case 2: value = "Close view"; break;
case 3: value = "Distant view"; break;
default: value = "Reserved"; break;
}
}
break;
case 0x1E: // GPSDifferential
{
switch (uintval)
{
case 0: value = "Measurement without differential correction"; break;
case 1: value = "Differential correction applied"; break;
default: value = "Reserved"; break;
}
}
break;
case 0xA405: // FocalLengthIn35mmFilm
value = uintval + " mm";
break;
default: //
value = uintval.ToString();
break;
}
#endregion
}
break;
case 0x4:
value = BitConverter.ToUInt32(pitem.Value, 0).ToString();
break;
case 0x5:
{
#region 5 = RATIONAL (Two LONGs, unsigned)
var rat = new URational(pitem.Value);
switch (pitem.Id)
{
case 0x9202: // ApertureValue
value = "F/" + Math.Round(Math.Pow(Math.Sqrt(2), rat.ToDouble()), 2).ToString();
break;
case 0x9205: // MaxApertureValue
value = "F/" + Math.Round(Math.Pow(Math.Sqrt(2), rat.ToDouble()), 2).ToString();
break;
case 0x920A: // FocalLength
value = rat.ToDouble().ToString() + " mm";
break;
case 0x829D: // F-number
value = "F/" + rat.ToDouble().ToString();
break;
case 0x11A: // Xresolution
value = rat.ToDouble().ToString();
break;
case 0x11B: // Yresolution
value = rat.ToDouble().ToString();
break;
case 0x829A: // ExposureTime
value = rat.ToString() + " sec";
break;
case 0x2: // GPSLatitude
value = new GPSRational(pitem.Value).ToString();
break;
case 0x4: // GPSLongitude
value = new GPSRational(pitem.Value).ToString();
break;
case 0x6: // GPSAltitude
value = rat.ToDouble() + " meters";
break;
case 0xA404: // Digital Zoom Ratio
value = rat.ToDouble().ToString();
if (value == "0")
{
value = "none";
}
break;
case 0xB: // GPSDOP
value = rat.ToDouble().ToString();
break;
case 0xD: // GPSSpeed
value = rat.ToDouble().ToString();
break;
case 0xF: // GPSTrack
value = rat.ToDouble().ToString();
break;
case 0x11: // GPSImgDir
value = rat.ToDouble().ToString();
break;
case 0x14: // GPSDestLatitude
value = new GPSRational(pitem.Value).ToString();
break;
case 0x16: // GPSDestLongitude
value = new GPSRational(pitem.Value).ToString();
break;
case 0x18: // GPSDestBearing
value = rat.ToDouble().ToString();
break;
case 0x1A: // GPSDestDistance
value = rat.ToDouble().ToString();
break;
case 0x7: // GPSTimeStamp
value = new GPSRational(pitem.Value).ToString(":");
break;
default:
value = rat.ToString();
break;
}
#endregion
}
break;
case 0x7:
switch (pitem.Id)
{
case 0xA300: //FileSource
{
value = pitem.Value[0] == 3 ? "DSC" : "reserved";
break;
}
case 0xA301: //SceneType
value = pitem.Value[0] == 1 ? "A directly photographed image" : "reserved";
break;
case 0x9000: // Exif Version
value = Ascii.GetString(pitem.Value).Trim('\0');
break;
case 0xA000: // Flashpix Version
value = Ascii.GetString(pitem.Value).Trim('\0');
value = value == "0100" ? "Flashpix Format Version 1.0" : "reserved";
break;
case 0x9101: //ComponentsConfiguration
value = GetComponentsConfig(pitem.Value);
break;
case 0x927C: //MakerNote
value = Ascii.GetString(pitem.Value).Trim('\0');
break;
case 0x9286: //UserComment
value = Ascii.GetString(pitem.Value).Trim('\0');
break;
case 0x1B: //GPS Processing Method
value = Ascii.GetString(pitem.Value).Trim('\0');
break;
case 0x1C: //GPS Area Info
value = Ascii.GetString(pitem.Value).Trim('\0');
break;
default:
value = "-";
break;
}
break;
case 0x9:
value = BitConverter.ToInt32(pitem.Value, 0).ToString();
break;
case 0xA:
{
#region 10 = SRATIONAL (Two SLONGs, signed)
var rat = new Rational(pitem.Value);
switch (pitem.Id)
{
case 0x9201: // ShutterSpeedValue
value = "1/" + Math.Round(Math.Pow(2, rat.ToDouble()), 2).ToString();
break;
case 0x9203: // BrightnessValue
value = Math.Round(rat.ToDouble(), 4).ToString();
break;
case 0x9204: // ExposureBiasValue
value = Math.Round(rat.ToDouble(), 2).ToString() + " eV";
break;
default:
value = rat.ToString();
break;
}
#endregion
}
break;
}
return(value);
}