tests.md

PNG iCCP tests

These tests check that PNG files containing an ICC profile in the iCCP chunk are displayed by applying the ICC profile to the image RGB data (as required by the CSS Color 4 specification) and not by just throwing the image data at the screen.

Images are in the support directory, as required by WPT.

Initial, sanity-check tests

Ensure that untagged images (assumed sRGB) are displayed the same as tagged images with an sRGB ICC profile or, equivalently, as images with an sRGB chunk.

If either test fails, don't bother with the remaining tests.

• sRGB chunk, relative colorimetric intent
• untagged image, must be treated as sRGB

Embedded ICC v2 profiles

• sRGB with red and green colorants swapped
• CIE RGB
• ProPhoto RGB, gamma 1.8

Embedded ICC v4 profiles

• CIE RGB
• ProPhoto RGB, gamma 1.8
• Display P3

Embedded iccMAX profiles

none yet