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https://issues.apache.org/jira/browse/PDFBOX-5403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17518337#comment-17518337
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Oliver Schmidtmer commented on PDFBOX-5403:
-------------------------------------------
Tried it with the following code:
{code:java}
BufferedImage mask = pdImage.getImage();
byte[] inv = new byte[256];
for (int i = 0; i < inv.length; i++) {
inv[i] = (byte) (255 - i);
}
LookupTable table = new ByteLookupTable(0, inv);
BufferedImage tmp = new BufferedImage(mask.getWidth(),
mask.getHeight(), BufferedImage.TYPE_INT_RGB);
mask = new LookupOp(table,
graphics.getRenderingHints()).filter(mask, tmp);
{code}
Indeed that looks good on my PDF: However it breaks, also without the invert,
https://issues.apache.org/jira/secure/attachment/12853106/gs-bugzilla692158-schleuse-veryslow.pdf
and another PDF I currently can't share.
> 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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