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Posted to dev@pdfbox.apache.org by "Olivier DOREMIEUX (JIRA)" <ji...@apache.org> on 2011/01/14 20:04:48 UTC
[jira] Updated: (PDFBOX-942) Image quality improvements
[ https://issues.apache.org/jira/browse/PDFBOX-942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Olivier DOREMIEUX updated PDFBOX-942:
-------------------------------------
Attachment: PDJpeg.patch
> Image quality improvements
> --------------------------
>
> Key: PDFBOX-942
> URL: https://issues.apache.org/jira/browse/PDFBOX-942
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 1.4.0
> Reporter: Olivier DOREMIEUX
> Attachments: PDJpeg.patch
>
>
> The quality of the images inserted in a PDF documents could be improved by changing PDJpeg.java
> In the API
> public PDJpeg(PDDocument doc, BufferedImage bi) throws IOException
> ImageIO.write(bi, "jpeg", os);
> could be replaced 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();
> This increase the size of the generated PDF.
> By default the JPEG quality is 0.75, in the patch I use 1.0, the maximum quality
> As a suggestion the quality of the JPEG could be a global variable since it affect the size of the PDF
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