Tilman Hausherr commented on PDFBOX-4095:

As expected, the results are amazingly positive:

correct files:
- 007087-payment-due-p58.pdf: center color now accurate (lighter)
- 007087-payment-due-p58_reduced.pdf: color now accurate (darker)
- bugzilla829803.pdf: now correct, top and bottom color of the "egg" now correct
- gs-bugzilla578865.pdf: center color now accurate
- gs-bugzilla689931.pdf: now correct
- gs-bugzilla692721.pdf: now correct, grey shadow now there
- PDFBOX-2558-opp.pdf: now correct
- PDFBOX-3182.pdf: now correct
- PDFJS-6924.pdf: blue photograph now accurate (darker)

- BlendModes-rgb.pdf: all separable blending modes now good
- gs-bugzilla692766.pdf: image B2 now correct, images A3 and A4 still incorrect
- personal file 22579: more colors visible
- Isolation-rgb.pdf: upper part of "Difference" improved
- PDFBOX-2554-cmykrasterobjecttypes.pdf: parts blended to the background 
improved (didn't check whether they are correct because we don't fully support 
- A-Designers-Guide-to-Transparency-2007.pdf: p3: left item of "screen" now 
there; p15: purple items now there; p16: purple item top right now there
- Transparency_DesignGuide-2004.pdf: p5: left item of "overlay" now there; p20: 
purple items now there; p21: purple item top right now there

- PDFBOX-2898-Annotations.pdf: caret now yellow. PDF.js has the same problem. 
Maybe the annotations must be blended to the finished page and not to the 
"background". I'll leave this unchanged for now. Removing the /AP and letting 
Adobe create a new one brings an /AP without blending.  

not improved:
- gs-bugzilla691650-2.pdf: still incorrect
- gs-bugzilla697433-2.pdf: differently incorrect

Thank you again for your help in this matter.

> Non Separable Blend Modes implementation(HUE, SATURATION, COLOR, LUMINOSITY)
> ----------------------------------------------------------------------------
>                 Key: PDFBOX-4095
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4095
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Rendering
>    Affects Versions: 2.0.8
>            Reporter: savan patel
>            Priority: Major
>         Attachments: BlendComposite.java.patch, BlendMode.java.patch, 
> COSName.java.patch, blendmodes.pdf, gs-bugzilla690477.pdf, 
> gs-bugzilla697433-1.pdf
> I have a patch for implementation of non separable blend modes...

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