HEIF/AVIF color space error

[XPRAMT]

Describe the bug

When saving images as HEIF/AVIF using pillow_heif, color shifts occur because pillow_heif uses incorrect color tagging.

Error color:

Correct Color:

Steps/Code to Reproduce

if fmt == "HEIF" or fmt == "AVIF":
img.save(save_path, format=fmt, quality=quality)

Expected Results

Color primaries : | BT.709
Transfer characteristics : | BT.709
Matrix coefficients : | BT.709

Actual Results

Color primaries : | BT.709
Transfer characteristics : | sRGB/sYCC
Matrix coefficients : | BT.601

Versions

3.10.11 (tags/v3.10.11:7d4cc5a, Apr  5 2023, 00:38:17) [MSC v.1929 64 bit (AMD64)]
Windows-10-10.0.26120-SP0
1.0.0
{'libheif': '1.19.8', 'HEIF': 'x265 HEVC encoder (4.1+1-1d117be)', 'AVIF': '', 'encoders': {'x265': 'x265 HEVC encoder (4.1+1-1d117be)', 'mask': 'mask'}, 'decoders': {'libde265': 'libde265 HEVC decoder, version 1.0.16'}}

[bigcat88]

I'll take a look when I have time (maybe within a month), but if someone wants to make a PR that fixes this (and add tests for it if possible) - I'm open to review and merge.

[XPRAMT]

The Libheif project has addressed this issue and the adjustments are expected to be included in version 1.20.2. b605667

The --color-profile = compatible option ensures that colors are displayed correctly on most systems.

[bigcat88]

If anyone is interested, I'd be happy to accept a PR for this. I personally don't have time to do this in the next month.