| Summary: | Poppler can't display transparent JPEG 2000 images | ||
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| Product: | poppler | Reporter: | Tristan Miller <psychonaut> |
| Component: | general | Assignee: | poppler-bugs <poppler-bugs> |
| Status: | RESOLVED FIXED | QA Contact: | |
| Severity: | normal | ||
| Priority: | medium | CC: | psychonaut |
| Version: | unspecified | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: |
PDF including several test images
PNG showing how Attachment 120624 is rendered handle SMaskInData = 0 for JPX encoded images |
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Created attachment 120625 [details] PNG showing how Attachment 120624 [details] is rendered The attached PNG file shows how Attachment 120624 [details] is rendered by Okular, Evince, Gimp, etc. Mmmh, Tristan, image 2 and 3 contain an alpha channel and are therefore not handled correctly by poppler. BUT: where in case of image 1 an image object and a corresponding smask is set in the PDF and so the transparency remains, the parameter SMaskInData is not set for image 2 and 3. The PDF spec says that in this case the alpha channel in the jpx encoded data should be ignored (Default: SMaskInData = 0). So these images will remain non-transparent and look like image 5. I will upload a patch that handles SMaskInData = 0 correctly but still will not display correctly if SMaskInData is 1 or 2. This would mean more effort also in the output devices to handle that correctly, so I will not implement that before I get some good examples. Created attachment 122230 [details] [review] handle SMaskInData = 0 for JPX encoded images This patch fixes it in case of SMaskInData = 0 Pushed |
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Created attachment 120624 [details] PDF including several test images Poppler seems to properly decode most non-transparent JPEG 2000 images in PDFs. However, transparent JPEG 2000 images are distorted beyond recognition. Attached is a PDF with five images: 1. A transparent bitmap 2. #1 converted into a transparent JPEG 2000 with OpenJPEG 3. #1 converted into a transparent JPEG 2000 with GraphicsMagick (no idea how it does this; possibly it just invokes OpenJPEG) 4. #1 converted into a non-transparent JPEG 2000 with GraphicsMagick 5. #1 converted into a non-transparent JPEG 2000 with Jasper All the images display fine except for the two transparent JPEG 2000s.