ICC profiles support for images

[13xforever]

Right now pdf.js ignores embedded color profiles of any kind.

Here's a test pdf that looks just fine with Windows Reader on Windows 8, but shows no support in PDF.js.

And yes, Firefox does work (same test, but as html: http://www.color.org/version4html.xalter)

[13xforever]

Details:
firefox 21.0a2 (2013-02-28)
pdf.js version 0.7.256
screenshot:

[gigaherz]

The HTML site shows version 2 support only in here (windows 7 x64, firefox aurora), is this something new to windows 8?

[gigaherz]

SumatraPDF doesn't support those profiles either, so I wonder how important the support really is?

[13xforever]

ICCv4 is disabled by default in Firefox, you have to flip gfx.color_management.enablev4 to True

[13xforever]

I don't know how important it is, but I couldn't find any relevant bug, so I made a new one with links to test cases.

[gigaherz]

Yeah it's okay, better to have a tracking bug. Worst case the devs would close as "won't fix", best case it gives some dev or contributor something to do ;P

[SamyCookie]

I don't know if it works, but if it can help someone to implement ICC profiles, I found this:
https://formats.kaitai.io/icc_4/javascript.html
It seems to be CC0 license, it may be a start to begin ICC profiles support.

[SumatraPeter]

Frankly it's a bit ridiculous that Firefox's PDF viewer (PDF.js) still lacks support for both v2 and v4 profiles in the year 2020. 😠 👎

[nvmnghia]

Seems that even Chrome doesn't support v4 profile.

[glennwilton]

Ive written an ICC engine in Javascript, It can read V2 and V2 color profiles, takes around 40ms to build a 33x33x33 LUT and CMYK>RGB via Uint8ClampedArray is in the order of 20-30 million PIXELS per second, Its not public yet, let me know if anyone is interested in me releasing the code.

[CKingX]

Seems that even Chrome doesn't support v4 profile.

Chrome supports v4 now. Same for Edge and iOS PDF viewer when I tested.

[glennwilton]

I released my Javascript ICC color engine here: https://www.npmjs.com/package/jscolorengine. I don't have time to implement it in PDFJS, but someone else might be able to look into it, however I believe its only halfway as there might be need to implement Type 1 Color Rendering Dictionary, however there is groundwork in my code for handling all of this.