public void Compress(PdfObject pdfObject, PdfDictionary pdfImageObject, PdfStamper stamper, int pageNum)
{
var image = new PdfImageObject((PRStream)pdfImageObject);
var oldBytes = image.GetImageAsBytes();
var compressedBitmapInfo = CompressImage(oldBytes, CompressionQuality.Low, pageNum);
Bitmap bitmap = compressedBitmapInfo.Item1;
if (compressedBitmapInfo.Item1 == null)
{
return;
}
iTextSharp.text.Image compressedImage;
using (var shrinkedBitmap = ShrinkImage(bitmap, _recommendedCompression))
{
if (shrinkedBitmap == null)
{
return;
}
Image palettedImage = shrinkedBitmap;
if (compressedBitmapInfo.Item2 != PixelFormat.Undefined)
{
var bitsPerPixel = GetIntPalette(compressedBitmapInfo.Item2);
if (bitsPerPixel > 0)
{
palettedImage = GdiPaletteConverter.ConvertBitmapTo1Or8Bpp(shrinkedBitmap, bitsPerPixel);
}
}
using (var msInternal = new MemoryStream())
{
//Checked for T_ file, resolution: Png format took less space up to 10% rather JPEG
//var newBytes = ConvertImageToBytes(palettedImage, 90);
palettedImage.Save(msInternal, _imageOutputFormat);
var newBytes = msInternal.ToArray();
compressedImage = iTextSharp.text.Image.GetInstance(newBytes);
}
shrinkedBitmap.Dispose();
if (compressedBitmapInfo.Item1 != null)
{
compressedBitmapInfo.Item1.Dispose();
}
palettedImage.Dispose();
}
PdfReader.KillIndirect(pdfObject);
var mask = compressedImage.ImageMask;
if (mask != null)
{
stamper.Writer.AddDirectImageSimple(mask);
}
stamper.Writer.AddDirectImageSimple(compressedImage, (PRIndirectReference)pdfObject);
}
private ImageFormat _imageOutputFormat = ImageFormat.Png; //for T_.., Sthlm.. files
public void Compress(PdfObject pdfObject, PdfDictionary pdfImageObject, PdfStamper stamper, int pageNum)
{
var stream = (PRStream)pdfImageObject;
var image = new PdfImageObject(stream);
var imageBytes = image.GetImageAsBytes();
using (var ms = new MemoryStream(imageBytes))
{
var fileType = FreeImage.GetFileTypeFromStream(ms);
var sourceBitmap = FreeImage.LoadFromStream(ms, FREE_IMAGE_LOAD_FLAGS.PNG_IGNOREGAMMA, ref fileType);
var dotnetBitmap = FreeImage.GetBitmap(sourceBitmap);
iTextSharp.text.Image compressedImage;
using (var shrinkedBitmap = ShrinkImage(dotnetBitmap, _recommendedCompression))
{
if (shrinkedBitmap == null)
{
return;
}
System.Drawing.Image newImage = shrinkedBitmap;
if (DefineBitPerPixel(sourceBitmap) <= 8)
{
newImage = GdiPaletteConverter.ConvertBitmapTo1Or8Bpp(shrinkedBitmap, 1);
}
using (var msInternal = new MemoryStream())
{
newImage.Save(msInternal, _imageOutputFormat);
var newBytes = msInternal.ToArray();
compressedImage = iTextSharp.text.Image.GetInstance(newBytes);
}
shrinkedBitmap.Dispose();
newImage.Dispose();
}
dotnetBitmap.Dispose();
FreeImage.Unload(sourceBitmap);
sourceBitmap.SetNull();
PdfReader.KillIndirect(pdfObject);
stamper.Writer.CompressionLevel = PdfStream.BEST_COMPRESSION;
var mask = compressedImage.ImageMask;
if (mask != null)
{
stamper.Writer.AddDirectImageSimple(mask);
}
stamper.Writer.AddDirectImageSimple(compressedImage, (PRIndirectReference)pdfObject);
}
}