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https://issues.apache.org/jira/browse/PDFBOX-5065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17257328#comment-17257328
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Tilman Hausherr commented on PDFBOX-5065:
-----------------------------------------
gs-bugzilla690816.pdf is related to having a CMYK group colorspace combined
with "differences" blending. I tried creating a CMYK image near "// FIXME -
color space" like this
{code}
else if (colorSpace instanceof PDDeviceCMYK)
{
String name = "/org/apache/pdfbox/resources/icc/ISOcoated_v2_300_bas.icc";
ColorSpace cmykCS;
try (InputStream resourceAsStream =
PDDeviceCMYK.class.getResourceAsStream(name);
InputStream is = new BufferedInputStream(resourceAsStream))
{
cmykCS = new ICC_ColorSpace(ICC_Profile.getInstance(is));
}
// https://stackoverflow.com/a/46153884/535646
ColorModel colorModel = new ComponentColorModel(cmykCS, true, false,
Transparency.TRANSLUCENT, DataBuffer.TYPE_BYTE);
image = new BufferedImage(colorModel,
colorModel.createCompatibleWritableRaster(width, height),
colorModel.isAlphaPremultiplied(), null);
}
{code}
but that didn't help. Maybe both source and destination image must be converted
to CMYK before blending and then back. It reminds me of [that video with Dr.
Hans Bärfuss|https://www.youtube.com/watch?v=TiqDqd-1pwU].
> Transparency Group issues (2)
> -----------------------------
>
> Key: PDFBOX-5065
> URL: https://issues.apache.org/jira/browse/PDFBOX-5065
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.22
> Reporter: Tilman Hausherr
> Priority: Major
> Labels: Transparency
> Attachments: gs-bugzilla690816.pdf, gs-bugzilla691650-2.pdf,
> gs-bugzilla691650-2_reduced.pdf, gs-bugzilla693033.pdf,
> gs-bugzilla697433-2.pdf, samsung_galaxy_s_4_um-p1_reduced.pdf
>
>
> Follow-up to PDFBOX-3000. Following files don't render properly and it's
> likely transparency group issues:
> - eci_altona-test-suite-v2_technical2_one-patch-per-page_x4.pdf, pages 7 and
> 8 (file found at http://www.eci.org/de/downloads )
> - gs-bugzilla690816.pdf, rectangle top left
> - gs-bugzilla691650-2.pdf, fade in the mid rectangle is in wrong direction
> - gs-bugzilla693033.pdf, UN logo
> - gs-bugzilla697433-2.pdf, inner rectangle missing
> - samsung_galaxy_s_4_um-p1_reduced.pdf, background rectangle shouldn't be
> there
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