Matthias Bläsing created PDFBOX-3564:
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Summary: SoftMask needs consider colormodel of input Image
Key: PDFBOX-3564
URL: https://issues.apache.org/jira/browse/PDFBOX-3564
Project: PDFBox
Issue Type: Improvement
Components: Rendering
Affects Versions: 2.0.3
Reporter: Matthias Bläsing
Attachments: softmask.patch
I'm currently following a rendering problem of a poster. While doing so I found
a first lead, that resulted in a first patch.
The PDF I'll attach contains an image with a mask applied to it. If rendering
works correctly, only a single green "OK" should be visible. With pdfbox 2.0.3
and HEAD I get a white sheet.
I tracked this down into SoftMask.java. There a source raster is sampled by
querying the pixel data via getPixel(int,int,int[]). This will only work
correctly for RGBA input sources. In my case the input image is an RGB image
and getPixel does not overwrite the initial 0 value in the rgba value array.
The attached patch uses the colormodel corresponding to the source raster to
convert into the components. This correctly returns the alpha value of an RGB
image as 255.
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