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https://issues.apache.org/jira/browse/PDFBOX-5403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17520835#comment-17520835
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Oliver Schmidtmer commented on PDFBOX-5403:
-------------------------------------------
Next try :)
scaleX/scaleY (m00, m11) in the Matrix might be 0.0. In those the shearing
(m01, m10) are non 0.0. That probably is a 90° rotation. If those are used for
scaling it works.
Then again, if the factor is too small, the result still gets too blurry. For
that I added the <.25 -> *2 loop.
[^inverse-smooth-scale-shear.patch]
> 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,
> image-2022-03-31-11-55-36-061.png, inver-smooth-scale.patch,
> inverse-smooth-scale-shear.patch
>
>
> 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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