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https://issues.apache.org/jira/browse/PDFBOX-2204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14059965#comment-14059965
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John Hewson edited comment on PDFBOX-2204 at 7/13/14 12:24 AM:
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The image is using an indexed color model, which is why getComponentSize(0) is
8, as expected, but getPixelSize() is only 4. The current code doesn't take
that into account though. I don't see any way to query the color space to
discover how many bits per components are in the _input_ to the index instead
of the _output_, but I think we can discover this from the raster, maybe:
{code}
bpc = image.getColorModel().getPixelSize() / image.getRaster.getNumBands()
{code}
was (Author: jahewson):
The image is using an indexed color model, which is why getComponentSize(0) is
8, as expected, but getPixelSize() is only 4. The current code doesn't take
that into account though. I don't see any way to query the color space to
discover how many bits per components are in the _input_ to the index instead
of the _output_, but I think we can discover this from the raster, maybe:
{code}
bpc = image.getColorModel().getPixelSize() * image.getRaster.getNumBands()
{code}
> java.lang.ArrayIndexOutOfBoundsException in SampledImageReader.from8bit
> -----------------------------------------------------------------------
>
> Key: PDFBOX-2204
> URL: https://issues.apache.org/jira/browse/PDFBOX-2204
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.0
> Reporter: Tilman Hausherr
> Labels: JPEG2000, JPXDecode, JPXFilter
> Attachments: PDFBOX-2204-012411.pdf, pdfbox-2204-012411.pdf-11.png
>
>
> I get this with the attached file on page 11:
> {code}
> java.lang.ArrayIndexOutOfBoundsException: 8296
> at
> org.apache.pdfbox.pdmodel.graphics.image.SampledImageReader.from8bit(SampledImageReader.java:253)
> at
> org.apache.pdfbox.pdmodel.graphics.image.SampledImageReader.getRGBImage(SampledImageReader.java:146)
> at
> org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject.getImage(PDImageXObject.java:188)
> at
> org.apache.pdfbox.util.operator.pagedrawer.Invoke.process(Invoke.java:80)
> {code}
> The problem is in JPXFilter. Per the spec, we must ignore the
> BITS_PER_COMPONENT value from the PDF and use the one from the image. We set
> BITS_PER_COMPONENT to 8 because colorModel.getComponentSize(0) is 8.
> colorModel.getPixelSize() is 4. In "normal" images, the sum of the
> colorModel.getComponentSize() values equals colorModel.getPixelSize().
> I'm not sure what to do. I am using this code locally:
> {code}
> ColorModel colorModel = image.getColorModel();
> int pixelSize = colorModel.getPixelSize();
> int[] componentSize = colorModel.getComponentSize();
> if (pixelSize < componentSize[0])
> {
> LOG.warn("componentSize[0] of image ignored, because
> pixelSize < componentSize[0]");
> LOG.warn("pixelSize: " + pixelSize);
> LOG.warn("componentSize.length " + componentSize.length);
> for (int i = 0; i < componentSize.length; ++i)
> {
> LOG.warn("componentSize[" + i + "]: " + componentSize[i]);
> }
> }
> else
> {
> parameters.setInt(COSName.BITS_PER_COMPONENT,
> componentSize[0]);
> }
> {code}
> and now the PDF renders properly and the image at the bottom right is almost
> correct. (A circle on the left is missing)
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