[jira] Updated: (PDFBOX-975) Shape transparency not respected when exporting to image

["Jesse Eichar (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jesse Eichar updated PDFBOX-975:
--------------------------------

    Attachment: pdfbox-transparency.zip

Project demonstrating issue

> Shape transparency not respected when exporting to image
> --------------------------------------------------------
>
>                 Key: PDFBOX-975
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-975
>             Project: PDFBox
>          Issue Type: Bug
>            Reporter: Jesse Eichar
>              Labels: patch, pdf, pdfbox, transparent
>         Attachments: pdfbox-transparency.zip
>
>
> When a pdf file has a shape that is drawn with a transparency value the transparency values are not respected when exported to image.  
> I have attached a small patch that fixes this issue.  The patch does not fully satisfy the PDF transparency model, for example only Alpha composition is used.  But it covers the most common use-case of drawing shapes with a transparency value for fill and stroke.  
> I have also attached a maven project that demonstrates the issue.  It had a pdf with a shape in it that is semi transparent.  Running the application (execute the runexample.sh script) will load that pdf and export it as an image.  During the export (the output is a file called pdfAsImage) the transparency is lost.  
> Compare the exported image and the original pdf to see the difference.  PDF is in src/main/resources/...

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