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https://issues.apache.org/jira/browse/PDFBOX-5403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17515215#comment-17515215
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Oliver Schmidtmer commented on PDFBOX-5403:
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I think there is some issue with placing the alpha mask.
If I just set the pixels to "{color:#000000}raster{color}.setPixel(x, y,
{color:#0033b3}new int{color}[]{ {color:#1750eb}0{color},
{color:#1750eb}0{color}, {color:#1750eb}0{color},
alphaPixel[{color:#1750eb}0{color}]});" there is a line, which hints on an
offset in the {color:#000000}renderedMask-images.
{color}
{color:#000000}Setting "raster.setPixel(x, y, {color:#0033b3}new int{color}[]{
{color:#1750eb}0{color}, {color:#1750eb}0{color}, {color:#1750eb}0{color},
255});" would cause a closed black.{color}
{color:#000000}This then also messes up
[^gs-bugzilla692158-schleuse-veryslow.pdf] showing a grid pattern.{color}
!image-2022-03-31-11-55-36-061.png!
> 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
>
>
> 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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