Support embedded ICC color profile

[o-l-a-v]

It seems CactusView does not yet support viewing images with embedded ICC color profile properly. I tested with both JPG and PNG.

Test image source:

• Web page containing multiple images: https://people.csail.mit.edu/ericchan/hdr/hdr-jxl.php
• Image in question: https://people.csail.mit.edu/ericchan/hdr/jxl_images/20140606_102418_IMGP0297.jxl

Test images transcoded by me:

• forest.zip

JPEG example

Sample image can be transcoded to JPG with ICC profile using libjxl ( https://github.com/libjxl/libjxl/releases/tag/v0.9.1 ) like so:

• With XYB: ".\libjxl-v0.9.1\cjpegli.exe" ".\forest.jxl" ".\forest_xyb.jpg" --quality=90 --xyb --chroma_subsampling=444
• Without XYB: ".\libjxl-v0.9.1\cjpegli.exe" ".\forest.jxl" ".\forest.jpg" --quality=90 --chroma_subsampling=444

Result in CactusView vs. GIMP

Using XYB

Not using XYB

PNG example

Sample image can be transcoded to PNG with ICC profile using libjxl ( https://github.com/libjxl/libjxl/releases/tag/v0.9.1 ) like so:

• ".\libjxl-v0.9.1\djpegli.exe" ".\forest.jpg" ".\forest.png"

Result CactusView vs. GIMP

[Wassimulator]

I will need to inspect how these things are encoded and how I should display them. I don't have much knowledge about how these are done. if you have any info or tips I'd appreciate it.

[o-l-a-v]

Cool. 😊 I don't know much about that either, sorry. Maybe the source code of other projects (viewers, decoders?) that handles ICC can be helpful.

[Wassimulator]

I'll take a look into it once I find the time