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https://issues.apache.org/jira/browse/PDFBOX-5403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17514676#comment-17514676
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Oliver Schmidtmer commented on PDFBOX-5403:
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There are alpha values between 0 and 255, so I tried adding interpolation.
I think it improves somewhat, but I think there is still another issue. There
are 1px lines which I think are caused by an offset between image and mask,
which generally lowers the image quality. That is visible before and after my
changes.
I have another PDF, where this is more noticable. However, I am waiting whether
our customer allows to share it.
!image-2022-03-30-14-39-12-855.png|width=634,height=352!
> 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
> Priority: Major
> 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
>
>
> 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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