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https://issues.apache.org/jira/browse/PDFBOX-5403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17575541#comment-17575541
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Tilman Hausherr commented on PDFBOX-5403:
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I also tested using GRAY instead of RGB and it worked but I didn't modify that,
because I remember that a long time ago during a crazy debug session I
discovered that java is converting everything to RGB internally. There's
probably a code comment or a JIRA comment somewhere.
> Blurry / distorted rendering
> ----------------------------
>
> Key: PDFBOX-5403
> URL: https://issues.apache.org/jira/browse/PDFBOX-5403
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.25
> Reporter: Oliver Schmidtmer
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.27, 3.0.0 PDFBox
>
> Attachments: alpha_interpolation.patch, bad rendering.pdf,
> image-2022-03-29-18-29-03-860.png, image-2022-03-30-14-39-12-855.png,
> image-2022-03-31-11-55-36-061.png, inver-smooth-scale.patch,
> inverse-smooth-scale-shear-2.patch, inverse-smooth-scale-shear-3.patch,
> inverse-smooth-scale-shear.patch, screenshot-1.png
>
>
> The attached PDF uses many stripes with an image and a mask.
> There seems to be an issue when mask and image are combined.
> !image-2022-03-29-18-29-03-860.png|width=518,height=91!
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