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From Andreas Lehmkühler (JIRA) <j...@apache.org>
Subject [jira] [Commented] (PDFBOX-1223) Strange color issues with convertToImage method
Date Fri, 18 May 2012 09:44:21 GMT

    [ https://issues.apache.org/jira/browse/PDFBOX-1223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13278673#comment-13278673

Andreas Lehmkühler commented on PDFBOX-1223:

I had a look into all 4 cases.

- case3 works fine with the current trunk (revision 1339254)
- all other cases are don't render correct because of some missing features (Overprintcontrol
of an extended graphics state)
- saying that, I changed the type of this issue to "New Feature"

> Strange color issues with convertToImage method
> -----------------------------------------------
>                 Key: PDFBOX-1223
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-1223
>             Project: PDFBox
>          Issue Type: New Feature
>    Affects Versions: 1.6.0
>            Reporter: Jimi Hullegård
>              Labels: colorspaces, convertToImage, rendering, transparent
>         Attachments: case1.pdf, case1.png, case2.pdf, case2.png, case3.pdf, case3.png,
> While testing PDFBox I noticed a few strange color issues when converting the first page
of an pdf to an image using the method convertToImage on a PDPage. An example pdf and resulting
png is attached for each case.
> - Case 1: Most of the colors seem to get inverted.
> - Case 2: The green color of the area in the top right is paler the the original, and
the text under the logo at the bottom right is quite "pixely"
> - Case 3: The blue area under the text is missing
> - Case 4: The red area should be semi-transparent (so the rose stem can be seen behind
it), not solid.
> I compared all resulting images with how the pdf looks in Foxit Reader 5.1 on Windows
> This is the code I used:
> ---------
> PDFParser parser = new PDFParser(new FileInputStream(pdfInputFile));
> parser.parse();
> PDDocument document = parser.getPDDocument();
> List<PDPage> pages = (List<PDPage>)document.getDocumentCatalog().getAllPages();
> if (pages.size() > 0) {
> 	PDPage page = pages.get(0);
> 	BufferedImage image = page.convertToImage(BufferedImage.TYPE_INT_RGB, 300);		
> 	ImageIO.write(image, "png", pngOutputFile);
> }
> ---------
> If there is some change I can do in my code or some configuration to improve some of
these issues, then I would love to hear about it. As a comparison, Ghost4j (with Ghostscript
underneath) can handle these cases better. Even the text under the logo in case 2 was less
"pixely", with the same resolution.

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