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https://issues.apache.org/jira/browse/PDFBOX-2971?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Petr Slaby updated PDFBOX-2971:
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Attachment: ExternesDokument_modif.pdf
> CalGray white rendered as cyan
> ------------------------------
>
> Key: PDFBOX-2971
> URL: https://issues.apache.org/jira/browse/PDFBOX-2971
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: Petr Slaby
> Priority: Minor
> Attachments: ExternesDokument_modif.pdf
>
>
> The attached PDF uses CalGray colors. When converted to a jpeg using
> PdfToImage, there is a cyan rectangle visible. Acrobat shows the same
> rectangle as white.
> The PDF uses a CalGray having white point (0.9505, 1, 1.089). The color value
> after applying gamma is 1.0, i.e. white was intended. The class PDCalGray
> multiplies the value by the white point to get X, Y, Z and sends it to the
> java built-in CIEXYZ profile to convert it into sRGB. I believe the problem
> is that the white point of CIEXYZ in java is (0.9642, 1.0000, 0.8249) and we
> need to adapt the white point before sending the values to it. There are
> several methods to do that, but the easiest one is a simple scaling. In our
> case it would meant to multiply the color value by the CIEXYZ white point
> instead of the white point given in the CalGray.
> I would not like to pretend that I am an expert in this area. I found the
> information in the internet and in the java sources of ColorSpace and
> ICC_ColorSpace and this is how I interpret it. An insight of someone who
> really understands the color management stuff would be appreciated. But my
> main point is that the result looks different compared to what is shown in
> Acrobat.
> The PDF originally comes from a customer and contains text above the
> rectangles. I have removed the texts.
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