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https://issues.apache.org/jira/browse/PDFBOX-5787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17827936#comment-17827936
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Tilman Hausherr edited comment on PDFBOX-5787 at 3/18/24 11:39 AM:
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I don't have a mac so I won't get the exception. All I see is that it happens
by converting a CMYK raster to RGB. You could try it yourself by trying to
create a raster from scratch:
WritableRaster raster = Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE,
width, height,
4, new Point(0, 0));
and then pass that one to code from toRGBImageAWT:
{code}
ColorModel colorModel = new ComponentColorModel(colorSpace,
false, false, Transparency.OPAQUE,
raster.getDataBuffer().getDataType());
BufferedImage src = new BufferedImage(colorModel, raster, false, null);
BufferedImage dest = new BufferedImage(raster.getWidth(),
raster.getHeight(),
BufferedImage.TYPE_INT_RGB);
colorConvertOp.filter(src,dest);
{code}
To get the colorspace, do {{new ICC_ColorSpace(iccProfile)}} on the icc profile
[^CGATS001Compat-v2-micro.icc] from PDFBox. To load that one, use
ICC_Profile.getInstance() on an inputStream of that file.
was (Author: tilman):
I don't have a mac so I won't get the exception. All I see is that it happens
by converting a CMYK raster to RGB. You could try it yourself by trying to
create a raster from scratch:
WritableRaster raster = Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE,
width, height,
4, new Point(0, 0));
and then pass that one to code from toRGBImageAWT:
{code}
ColorModel colorModel = new ComponentColorModel(colorSpace,
false, false, Transparency.OPAQUE,
raster.getDataBuffer().getDataType());
BufferedImage src = new BufferedImage(colorModel, raster, false, null);
BufferedImage dest = new BufferedImage(raster.getWidth(),
raster.getHeight(),
BufferedImage.TYPE_INT_RGB);
colorConvertOp.filter(src,dest);
{code}
To get the colorspace, do {{new ICC_ColorSpace(iccProfile)}} on the icc profile
[^CGATS001Compat-v2-micro.icc] from PDFBox. To load that one, use
ICC_Profile.getInstance() on the input stream.
> LCMS error 13: Mismatched alpha channels
> ----------------------------------------
>
> Key: PDFBOX-5787
> URL: https://issues.apache.org/jira/browse/PDFBOX-5787
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 3.0.2 PDFBox
> Reporter: Niklas
> Priority: Major
> Attachments: CGATS001Compat-v2-micro.icc
>
>
> Using Kotlin to load the first page and trying to render it as an
> `BufferedImage`:
> ```kotlin
> val pdf = Loader.loadPDF(file)
> val preview = PDFRenderer(pdf).renderImage(0, 1.0f)
> ```
> with a PDF, I'm running into:
> ```
> Exception in thread "main" java.awt.color.CMMException: LCMS error 13:
> Mismatched alpha channels
> at java.desktop/sun.java2d.cmm.lcms.LCMS.createNativeTransform(Native
> Method)
> at java.desktop/sun.java2d.cmm.lcms.LCMS.createTransform(LCMS.java:113)
> at
> java.desktop/sun.java2d.cmm.lcms.LCMSTransform.doTransform(LCMSTransform.java:114)
> at
> java.desktop/sun.java2d.cmm.lcms.LCMSTransform.colorConvert(LCMSTransform.java:149)
> at
> java.desktop/java.awt.image.ColorConvertOp.ICCBIFilter(ColorConvertOp.java:350)
> at
> java.desktop/java.awt.image.ColorConvertOp.filter(ColorConvertOp.java:277)
> at
> org.apache.pdfbox.pdmodel.graphics.color.PDColorSpace.toRGBImageAWT(PDColorSpace.java:375)
> at
> org.apache.pdfbox.pdmodel.graphics.color.PDDeviceCMYK.toRGBImageAWT(PDDeviceCMYK.java:212)
> at
> org.apache.pdfbox.pdmodel.graphics.color.PDDeviceCMYK.toRGBImage(PDDeviceCMYK.java:159)
> at
> org.apache.pdfbox.pdmodel.graphics.image.SampledImageReader.from8bit(SampledImageReader.java:506)
> at
> org.apache.pdfbox.pdmodel.graphics.image.SampledImageReader.getRGBImage(SampledImageReader.java:217)
> at
> org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject.getImage(PDImageXObject.java:477)
> at
> org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject.getImage(PDImageXObject.java:438)
> at org.apache.pdfbox.rendering.PageDrawer.drawImage(PageDrawer.java:1106)
> at
> org.apache.pdfbox.contentstream.operator.graphics.DrawObject.process(DrawObject.java:74)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:893)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:531)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:506)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:153)
> at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:286)
> at
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:330)
> at
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:247)
> at
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:207)
> ```
> Would it be possible to somehow privately share the PDF? It's slightly
> sensitive as it is from a customer of mine and I would not want to share it
> publicly.
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