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https://issues.apache.org/jira/browse/PDFBOX-5250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17909631#comment-17909631
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Tilman Hausherr edited comment on PDFBOX-5250 at 1/3/25 4:58 PM:
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Reduced file: [^PDFBOX-5250-pattern-reduced2.pdf]
I suspect it has something to do with processing of the transparency group,
removing "/Group 43 0 R" (which means it's now an ordinary form xobject) makes
it work.
was (Author: tilman):
Reduced file: [^PDFBOX-5250-pattern-reduced2.pdf]
I suspect it has something to do with processing of the transparency group,
removing "/Group 43 0 R" makes it work.
> Colors in PDF Tile Patterns are off
> -----------------------------------
>
> Key: PDFBOX-5250
> URL: https://issues.apache.org/jira/browse/PDFBOX-5250
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.24
> Reporter: Emmeran Seehuber
> Priority: Minor
> Attachments: PDFBOX-5250-pattern-reduced2.pdf, kachel4.pdf,
> pattern_colors_broken.pdf
>
>
> I've implementing for my customer some "text with pattern" features. In the
> attached PDF you see that in action.
> There is a color mapping problem in the patterned text in the left bottom
> corner in the PDFBox debugger. The colors are way to bright. Acrobat and
> MacOS Preview render this fine. FoxIt Reader also has some rendering issues
> with this (image seems distorted...).
> I've also attached the "base" PDF used for the pattern.
> It think the way I embed this should be fine:
> {code:java}
> return new OurPDColorCarrier((PDPageContentStream contentStream) -> {
> PDImageResult pdImage = throwing(() ->
> textureImage.getPDImageXObject(document, colorSpaceRegistry));
> Objects.requireNonNull(pdImage);
> PDTilingPattern pattern = new PDTilingPattern();
> pattern.setPaintType(PDTilingPattern.PAINT_COLORED);
> pattern.setTilingType(PDTilingPattern.TILING_NO_DISTORTION);
> var anchorInfo = TextRenderer.getTextureTileAnchor(textureImage);
> float textureImageWidth = (float) anchorInfo.originalWidth;
> float textureImageHeight = (float) anchorInfo.originalHeight;
> pattern.setBBox(
> new PDRectangle(0f, 0f, (float) dpi2mm(textureImageWidth), (float)
> dpi2mm(textureImageHeight)));
> pattern.setXStep((float) anchorInfo.anchor.getWidth());
> pattern.setYStep((float) anchorInfo.anchor.getHeight());
> double scaleFactor = pageWidth / renderTarget.width;
> /* Die Matrix ist lt. Spec für die Phasenverschiebung des Patterns da. */
> double countPhasen = (renderTarget.pageSize.getHeight() /
> anchorInfo.anchor.getHeight());
> double rest = renderTarget.pageSize.getHeight()
> - DoubleMath.roundToInt(countPhasen, RoundingMode.DOWN) *
> anchorInfo.anchor.getHeight();
> pattern.setMatrix(AffineTransform.getTranslateInstance(scaleFactor *
> currentTransform.getTranslateX(),
> renderTarget.pageSize.getHeight() - (scaleFactor *
> currentTransform.getTranslateY()) + rest));
> PDAppearanceStream appearance = new PDAppearanceStream(document);
> appearance.setResources(pattern.getResources());
> appearance.setBBox(pattern.getBBox());
> PDPageContentStream imageContentStream = new PDPageContentStream(document,
> appearance,
> ((COSStream) pattern.getCOSObject()).createOutputStream());
> if (pdImage.image instanceof PDFormXObject) {
> imageContentStream.transform(Matrix.getScaleInstance((float)
> (anchorInfo.originalWidth),
> (float) (anchorInfo.originalHeight)));
> pattern.setBBox(new PDRectangle(0f, 0f, (float)
> (anchorInfo.originalWidth),
> (float) (anchorInfo.originalHeight)));
> imageContentStream.drawForm((PDFormXObject) pdImage.image);
> } else {
> pattern.setMatrix(AffineTransform.getTranslateInstance(
> scaleFactor * currentTransform.getTranslateX(),
> renderTarget.pageSize.getHeight()
> - (scaleFactor * currentTransform.getTranslateY()) + rest /
> scaleFactor));
> imageContentStream.transform(
> Matrix.getScaleInstance((float) (anchorInfo.anchor.getWidth() /
> textureImageWidth),
> (float) (anchorInfo.anchor.getHeight() /
> textureImageHeight)));
> imageContentStream.drawImage((PDImageXObject) pdImage.image, 0, 0);
> }
> imageContentStream.close();
> PDResources resources = ModelUtils.getPrivateField(contentStream,
> "resources");
> COSName tilingPatternName = resources.add(pattern);
> return new PDColor(tilingPatternName, new PDPattern(null));
> });
> {code}
> Yes, in the third bottom line the
> {code:java}
> PDResources resources = ModelUtils.getPrivateField(contentStream,
> "resources"); {code}
> is an ugly reflection hack - any reason why the ContentStream does not expose
> its resources with a public API?
> This is with Java 11 on MacOS BigSur.
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