[jira] [Commented] (PDFBOX-2398) Image transparency lost when convert to an image

["Tilman Hausherr (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-2398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14155432#comment-14155432 ] 

Tilman Hausherr commented on PDFBOX-2398:
-----------------------------------------

This is related to transparency groups, which we support only partly in 2.0 (not 1.8.*), it is very complex. The rectangles are all black (CMYK with K = 1, i.e. black), however these are in XObject forms, and these are called with different graphic states, which have different "CA" values that go from 1 down to 0. "CA" = StrokingAlpaConstant. Thanks for submitting the test files, but it will probably take quite some time before this will be fixed.

> Image transparency lost when convert to an image
> ------------------------------------------------
>
>                 Key: PDFBOX-2398
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-2398
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Rendering
>    Affects Versions: 1.8.7, 2.0.0
>            Reporter: ccouturi
>              Labels: Transparency
>         Attachments: test.pdf, test.png
>
>
> I try to convert a pdf file with transparent images to a image but the opacity is lost in the png result.
> It's seem to be the same issue than https://issues.apache.org/jira/browse/PDFBOX-993 (fixed in 1.6.0).
> I test with code: (1.8.7)
> pdPage.convertToImage(BufferedImage.TYPE_4BYTE_ABGR, 72);
> and with:
> java -jar pdfbox-app-1.8.7.jar PDFToImage -imageType png test.pdf



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)