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https://issues.apache.org/jira/browse/PDFBOX-2104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14034127#comment-14034127
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Tilman Hausherr commented on PDFBOX-2104:
-----------------------------------------
The good news first: there are no regressions.
There are several images that come up different as before.
PDFBOX-1711: Problem solved
PDFBOX-1058: difference, one slight improvement (the logo), but another
difference shows that there was an error all the time and still is, in the two
intersecting curves on page 1.
PDFBOX-1691: improvement on page 2, "Fusswege zum Wasserwerk"
PDFBOX-1711: big improvement, colors "almost" correct.
PDFBOX-1577: Problem solved
PDFBOX-1697: Problem solved
Thanks Petr!
Not so good news: there are still files where an area isn't rendered at all,
e.g. PDFBOX-1451, the creston file (will attach this to the shading issue), p.
6 and 11 of the tracemonkey file (don't have the issue but there is one), the
"texample" file, and PDFBOX-1940, although I can't tell if all this is a
transparency issue or an "anomaly in the Matrix" issue.
> Implement transparency groups
> -----------------------------
>
> Key: PDFBOX-2104
> URL: https://issues.apache.org/jira/browse/PDFBOX-2104
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.0
> Reporter: Petr Slaby
> Assignee: John Hewson
> Labels: transparency
> Fix For: 2.0.0
>
> Attachments: 000001_MTEXT_CS6.pdf, TransparencyGroups.1.patch,
> TransparencyGroups.2.patch, TransparencyGroups.3.patch,
> TransparencyGroups.patch
>
>
> The attached PDF uses transparency groups, blending and soft masks to create
> the rounded corners and shades behind images. It appears that these features
> are not implemented in PDFBox. An implementation proposal is attached in the
> TransparencyGroup.patch. The basic idea is to create a buffered image, draw
> the transparency group content onto it and then use the result to produce the
> soft mask or draw the image on the original g2d.
> Note: I am not the (only) author of the proposed change. It was developed in
> our company few years ago in sources based on a 1.7.x version of PDFBox,
> mostly by a guy who already left. Over the years, merging of the work done in
> PDFBox main stream into our source base has become impossible due to many
> refactorings and other deep going changes done. Now we would like to go the
> opposite way - where possible - bring the changes and fixes we have done into
> PDFBox main stream and start to use it in our installations.
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