PDF Quality

[Olivier DOREMIEUX <ol...@doremieux.org>]

Hi,

I wasn't too happy with the quality of the generated PDF, especially 
because I am generating the PDF from images, so I did play a little bit 
with PDJpeg

In public PDJpeg(PDDocument doc, BufferedImage bi) throws IOException {

I did replace :

//ImageIO.write(bi, "jpeg", os);

By

             ImageWriter writer = null;
             Iterator iter = ImageIO.getImageWritersByFormatName("jpg");
             if (iter.hasNext()) {
                 writer = (ImageWriter) iter.next();
             }

             ImageOutputStream ios = ImageIO.createImageOutputStream(os);
             writer.setOutput(ios);

             // Set the compression quality
             JPEGImageWriteParam iwparam = new 
JPEGImageWriteParam(Locale.getDefault());
             iwparam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
             iwparam.setCompressionQuality(1.0f);

             // Write the image
             writer.write(null, new IIOImage(bi, null, null), iwparam);

             writer.dispose();


The quality is much better. I think by default the compression quality 
is 0.75
The PDF file is bigger. So maybe we could have a global parameter to set 
the desired quality, and use it in iwparam.setCompressionQuality(1.0f);


Hope this help and which that change can be integrated.

Thanks,

Olivier DOREMIEUX