public static void ReplaceStream(PRStream orig, PdfStream stream)
{
orig.Clear();
MemoryStream ms = new MemoryStream();
stream.WriteContent(ms);
orig.SetData(ms.ToArray(), false);
Console.WriteLine("Iterating keys");
foreach (System.Collections.Generic.KeyValuePair <PdfName, PdfObject> keyValuePair in stream)
{
orig.Put(keyValuePair.Key, stream.Get(keyValuePair.Key));
}
}
/// <summary>
/// Gets image from PDF and compresses it - Found on StackOverflow - asis
/// </summary>
/// <param name="reader"></param>
/// <param name="quality"></param>
public static void ReduceResolution(PdfReader reader, long quality)
{
int n = reader.XrefSize;
for (int i = 0; i < n; i++)
{
PdfObject obj = reader.GetPdfObject(i);
if (obj == null || !obj.IsStream())
{
continue;
}
PdfDictionary dict = (PdfDictionary)PdfReader.GetPdfObject(obj);
PdfName subType = (PdfName)PdfReader.GetPdfObject(
dict.Get(PdfName.SUBTYPE)
);
if (!PdfName.IMAGE.Equals(subType))
{
continue;
}
PRStream stream = (PRStream)obj;
try
{
PdfImageObject image = new PdfImageObject(stream);
//PdfName filter = (PdfName)image.Get(PdfName.FILTER);
//if (
// PdfName.JBIG2DECODE.Equals(filter)
// || PdfName.JPXDECODE.Equals(filter)
// || PdfName.CCITTFAXDECODE.Equals(filter)
// || PdfName.FLATEDECODE.Equals(filter)
//) continue;
System.Drawing.Image img = image.GetDrawingImage();
if (img == null)
{
continue;
}
var ll = image.GetImageBytesType();
int width = img.Width;
int height = img.Height;
using (System.Drawing.Bitmap dotnetImg =
new System.Drawing.Bitmap(img))
{
// set codec to jpeg type => jpeg index codec is "1"
System.Drawing.Imaging.ImageCodecInfo codec =
System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders()[1];
// set parameters for image quality
System.Drawing.Imaging.EncoderParameters eParams =
new System.Drawing.Imaging.EncoderParameters(1);
eParams.Param[0] =
new System.Drawing.Imaging.EncoderParameter(
System.Drawing.Imaging.Encoder.Quality, quality
);
using (MemoryStream msImg = new MemoryStream())
{
dotnetImg.Save(msImg, codec, eParams);
msImg.Position = 0;
stream.SetData(msImg.ToArray());
stream.SetData(
msImg.ToArray(), false, PRStream.BEST_COMPRESSION
);
stream.Put(PdfName.TYPE, PdfName.XOBJECT);
stream.Put(PdfName.SUBTYPE, PdfName.IMAGE);
stream.Put(PdfName.FILTER, image.Get(PdfName.FILTER));
stream.Put(PdfName.FILTER, PdfName.DCTDECODE);
stream.Put(PdfName.WIDTH, new PdfNumber(width));
stream.Put(PdfName.HEIGHT, new PdfNumber(height));
stream.Put(PdfName.BITSPERCOMPONENT, new PdfNumber(8));
stream.Put(PdfName.COLORSPACE, PdfName.DEVICERGB);
}
}
}
catch
{
// throw;
// iText[Sharp] can't handle all image types...
}
finally
{
// may or may not help
reader.RemoveUnusedObjects();
}
}
}
private void Do_Image(PdfStream stream)
{
byte[] imageBuffer = null;
PdfName filter = PdfName.NONE;
if (stream.Contains(PdfName.FILTER))
{
filter = stream.GetAsName(PdfName.FILTER);
}
int imageWidth = stream.GetAsNumber(PdfName.WIDTH).IntValue;
int imageHeight = stream.GetAsNumber(PdfName.HEIGHT).IntValue;
int imageBpp = stream.GetAsNumber(PdfName.BITSPERCOMPONENT).IntValue;
PRStream prStream = stream as PRStream;
bool cannotReadImage = false;
Bitmap image = null;
try
{
PdfImageObject pdfImage = new PdfImageObject(prStream);
image = pdfImage.GetDrawingImage() as Bitmap;
string strFile = "C:\\PDF_Print\\pdf" + bmpfileidx.ToString() + ".bmp";
image.Save(strFile);
bmpfileidx++;
}
catch
{
try
{
if (filter == PdfName.FLATEDECODE)
{
byte[] streamBuffer = PdfReader.GetStreamBytes(prStream);
image = this.CreateBitmapFromFlateDecodeImage(streamBuffer, imageWidth, imageHeight, imageBpp);
string strFile = "C:\\PDF_Print\\pdf_" + bmpfileidx.ToString() + ".bmp";
image.Save(strFile);
bmpfileidx++;
}
}
catch
{
cannotReadImage = true;
}
}
if (!cannotReadImage)
{
image = this.ConvertToGrayscale(image);
//image = this.ConvertToBlackWhite(image);
using (var ms = new MemoryStream())
{
System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;
ImageCodecInfo jgpEncoder = GetEncoder(ImageFormat.Jpeg);
EncoderParameters myEncoderParameters = new EncoderParameters(1);
EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, 80L);
myEncoderParameters.Param[0] = myEncoderParameter;
image.Save(ms, jgpEncoder, myEncoderParameters);
imageBuffer = ms.ToArray();
//imageBuffer = ms.GetBuffer();
iTextSharp.text.Image newImage = iTextSharp.text.Image.GetInstance(imageBuffer);
newImage.SimplifyColorspace();
// PdfImage tempPdfImage = new PdfImage(newImage, newImage.ToString(), null);
// prStream.Clear();
// prStream.SetDataRaw(imageBuffer);
// prStream.Merge(tempPdfImage);
// imageBuffer = newImage.OriginalData;
//
prStream.Clear();
prStream.SetData(imageBuffer, false, PRStream.NO_COMPRESSION);
prStream.Put(PdfName.TYPE, PdfName.XOBJECT);
prStream.Put(PdfName.SUBTYPE, PdfName.IMAGE);
prStream.Put(PdfName.FILTER, PdfName.DCTDECODE);
prStream.Put(PdfName.WIDTH, new PdfNumber(image.Width));
prStream.Put(PdfName.HEIGHT, new PdfNumber(image.Height));
prStream.Put(PdfName.BITSPERCOMPONENT, new PdfNumber(8));
prStream.Put(PdfName.COLORSPACE, PdfName.DEVICERGB);
prStream.Put(PdfName.LENGTH, new PdfNumber(imageBuffer.LongLength));
}
}
}
private void Do_Image(PdfStream stream)
{
byte[] imageBuffer = null;
PdfName filter = PdfName.NONE;
if (stream.Contains(PdfName.FILTER))
{
filter = stream.GetAsName(PdfName.FILTER);
}
int imageWidth = stream.GetAsNumber(PdfName.WIDTH).IntValue;
int imageHeight = stream.GetAsNumber(PdfName.HEIGHT).IntValue;
int imageBpp = stream.GetAsNumber(PdfName.BITSPERCOMPONENT).IntValue;
PRStream prStream = stream as PRStream;
bool cannotReadImage = false;
Bitmap image = null;
try
{
PdfImageObject pdfImage = new PdfImageObject(prStream);
image = pdfImage.GetDrawingImage() as Bitmap;
}
catch
{
try
{
if (filter == PdfName.FLATEDECODE)
{
byte[] streamBuffer = PdfReader.GetStreamBytes(prStream);
image = this.CreateBitmapFromFlateDecodeImage(streamBuffer, imageWidth, imageHeight, imageBpp);
}
}
catch
{
cannotReadImage = true;
}
}
if (!cannotReadImage)
{
image = this.ConvertToGrayscale(image);
using (var ms = new MemoryStream())
{
System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;
ImageCodecInfo jgpEncoder = GetEncoder(ImageFormat.Jpeg);
EncoderParameters myEncoderParameters = new EncoderParameters(1);
//EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, 80L);
EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, 15L);
myEncoderParameters.Param[0] = myEncoderParameter;
image.Save(ms, jgpEncoder, myEncoderParameters);
imageBuffer = ms.GetBuffer();
}
Image compressedImage = Image.GetInstance(imageBuffer);
imageBuffer = compressedImage.OriginalData;
prStream.Clear();
//prStream.SetData(imageBuffer, false, PRStream.NO_COMPRESSION);
prStream.SetData(imageBuffer, false, PRStream.BEST_COMPRESSION);
prStream.Put(PdfName.TYPE, PdfName.XOBJECT);
prStream.Put(PdfName.SUBTYPE, PdfName.IMAGE);
prStream.Put(PdfName.FILTER, PdfName.DCTDECODE);
prStream.Put(PdfName.WIDTH, new PdfNumber(image.Width));
prStream.Put(PdfName.HEIGHT, new PdfNumber(image.Height));
prStream.Put(PdfName.BITSPERCOMPONENT, new PdfNumber(8));
prStream.Put(PdfName.COLORSPACE, PdfName.DEVICERGB);
prStream.Put(PdfName.LENGTH, new PdfNumber(imageBuffer.LongLength));
}
}