Philipp Hörist pushed to branch master at gajim / gajim
Commits:
2abd98c1 by Marc Henning at 2026-09-01T16:51:16+00:00
imprv: Avatar: Use the sRGB relative luminance
HLS lightness is defined as (max+min)/2, which can classify bright colors
wrongly if they are saturated.
- - - - -
1 changed file:
- gajim/gtk/avatar.py
Changes:
=====================================
gajim/gtk/avatar.py
=====================================
@@ -4,7 +4,6 @@
from __future__ import annotations
-import colorsys
import functools
import hashlib
import logging
@@ -111,7 +110,8 @@ def generate_avatar(
text_color = (0.95, 0.95, 0.95)
if check_contrast:
- _hue, luminance, _saturation = colorsys.rgb_to_hls(*color)
+ # The constants are the CIE values of sRGB primaries for luminance Y
+ luminance = 0.2126 * color_r + 0.7152 * color_g + 0.0722 * color_b
if luminance > 0.6:
# Use dark text color if background luminance threshold is
surpassed
text_color = (0.2, 0.2, 0.2)
View it on GitLab:
https://dev.gajim.org/gajim/gajim/-/commit/2abd98c12a62e412d51e89cabbea218ee8fc3a8f
--
View it on GitLab:
https://dev.gajim.org/gajim/gajim/-/commit/2abd98c12a62e412d51e89cabbea218ee8fc3a8f
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