[ 
https://issues.apache.org/jira/browse/PDFBOX-3000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16354374#comment-16354374
 ] 

Jani Pehkonen commented on PDFBOX-3000:
---------------------------------------

{quote}It is even weirder. In the blend demo file by Boris Aronshtam one can 
see that blue on orange in blend mode "ColorDodge" produces an orange result 
with Adobe and a pink result with PDFBox.{quote}

The new PDF 2.0 standard provides revised equations for the blend modes 
ColorDodge and ColorBurn. These should produce correct colors:

{code:java}
    public static final SeparableBlendMode COLOR_DODGE = new 
SeparableBlendMode()
    {
        @Override
        public float blendChannel(float srcValue, float dstValue)
        {
            if (dstValue == 0)
            {
                return 0;
            }
            if (dstValue >= 1 - srcValue)
            {
                return 1;
            }
            return dstValue / (1 - srcValue);
        }
    };
{code}

{code:java}
    public static final SeparableBlendMode COLOR_BURN = new SeparableBlendMode()
    {
        @Override
        public float blendChannel(float srcValue, float dstValue)
        {
            if (dstValue == 1)
            {
                return 1;
            }
            if (1 - dstValue >= srcValue)
            {
                return 0;
            }
            return 1 - (1 - dstValue) / srcValue;
        }
    };
{code}


> Transparency Group issues
> -------------------------
>
>                 Key: PDFBOX-3000
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3000
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Rendering
>    Affects Versions: 2.0.0
>            Reporter: John Hewson
>            Priority: Major
>              Labels: Transparency
>             Fix For: 3.0.0 PDFBox
>
>         Attachments: 007087-payment-due-p58_reduced2.pdf, BlendModes-rgb.pdf, 
> PDFBOX-1697-reduced-rotations.pdf, PDFBOX-2182_mod.pdf, PDFBOX-3400-RGB.pdf, 
> PDFBOX-3494_reduced.pdf, PDFBOX-3494_reduced_cropX.pdf, PDFBOX-3564-Mask.pdf, 
> PDFBox3359PanelTestEnhanced.java, PDFJS-2845-p1.pdf, 
> PDFJS-5526-p13_reduced1.pdf, PDFJS-5526-p13_reduced2.pdf, 
> PDFJS-5526-p13_reduced3-nogroup.pdf, PDFJS-5811-2-p3_reduced.pdf, 
> PDFJS-5811-2-p3_reduced4.pdf, PDFJS-5811-2-p4_reduced-rotations.pdf, 
> PDFJS-5811-2.pdf, PDFJS-5853_reduced.pdf, PDFJS-6967-p8.pdf, 
> PDFJS-6967_reduced_outside_softmask.pdf, PDFJS-8136-p1.pdf, 
> PDFJS-8136-p1_reduced.pdf, SoftMask-Clipped.pdf, SoftMask.pdf, 
> blendmodes.pdf, circle-simple.pdf, ds-firewall-enterprise-p1_reduced.pdf, 
> gs-bugzilla689309-reduced-bc0.pdf, gs-bugzilla689309-reduced-bc1.pdf, 
> gs-bugzilla689309-reduced.pdf, gs-bugzilla689931_reduced-Multiply.pdf, 
> gs-bugzilla689931_reduced-Screen.pdf, 
> gs-bugzilla689931_reduced-ScreenBlendPageBackground.pdf, 
> gs-bugzilla690022-reduced-rotations-cropbox.pdf, 
> gs-bugzilla690022-reduced-rotations.pdf, gs-bugzilla690022_reduced.pdf, 
> gs-bugzilla691157.pdf, gs-bugzilla691157_mod_unc.pdf, 
> gs-bugzilla691157_mod_unc.png, gs-bugzilla691348.pdf, 
> gs-bugzilla691650-2.pdf, gs-bugzilla692217_reduced.pdf, 
> gs-bugzilla693134-giant-pattern-reduced.pdf, gs-bugzilla693322_reduced.pdf, 
> gs-bugzilla694556-3.pdf, gs-bugzilla695354.pdf, 
> gs-bugzilla695582-transparency-fill-stroke.pdf, 
> gs-bugzilla695582-transparency-fill-stroke.pdf-1.png, pop-bugzilla40164.pdf, 
> samsung_galaxy_s_4_um-p1_reduced.pdf, snowman-nose-gradient-rgb.pdf, 
> snowman-nose-gradient-rgb_reduced-0.6-bad2.pdf, 
> snowman-nose-gradient-rgb_reduced-0.7-good2.pdf, 
> snowman-nose-gradient-screenshot-comparison-11.12.2016.jpg, 
> snowman-nose-gradient.pdf, snowmen-opacity-clipping-masks-2.0.3.png, 
> snowmen-opacity-clipping-masks-2.1-SNAPSHOT-10.12.2016.png, 
> snowmen-opacity-clipping-masks-2.1.0-SNAPSHOT-2016-12-07.png, 
> snowmen-opacity-clipping-masks-adobe-illustrator.png, 
> snowmen-opacity-clipping-masks.pdf, softmask-rewrite-alt1.patch, 
> softmask-rewrite.patch
>
>
> This is a follow-up issue for transparency group issues from PDFBOX-2423. 
> More details to come.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscr...@pdfbox.apache.org
For additional commands, e-mail: dev-h...@pdfbox.apache.org

Reply via email to