Merge pull request #6 from radarhere/bc6h_gamma

Removed gamma correction
python-pillow · Oct 10, 2022 · 00d59a9 · 00d59a9
2 parents 93cafc8 + 78d258f
commit 00d59a9
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Showing 3 changed files with 3 additions and 8 deletions.
diff --git a/Tests/images/bc6h.png b/Tests/images/bc6h.png
diff --git a/Tests/images/bc6h_sf.png b/Tests/images/bc6h_sf.png
diff --git a/src/libImaging/BcnDecode.c b/src/libImaging/BcnDecode.c
@@ -688,21 +688,16 @@ bc6_clamp(float value) {
     }
 }
 
-static float
-bc6_gamma_correct(float value, float gamma) {
-    return powf(1.0f - expf(-value), 1.0f / gamma);
-}
-
 static void
 bc6_lerp(rgba *col, int *e0, int *e1, int s, int sign) {
     int r, g, b;
     int t = 64 - s;
     r = (e0[0] * t + e1[0] * s) >> 6;
     g = (e0[1] * t + e1[1] * s) >> 6;
     b = (e0[2] * t + e1[2] * s) >> 6;
-    col->r = bc6_clamp(bc6_gamma_correct(bc6_finalize(r, sign), 2.2f));
-    col->g = bc6_clamp(bc6_gamma_correct(bc6_finalize(g, sign), 2.2f));
-    col->b = bc6_clamp(bc6_gamma_correct(bc6_finalize(b, sign), 2.2f));
+    col->r = bc6_clamp(bc6_finalize(r, sign));
+    col->g = bc6_clamp(bc6_finalize(g, sign));
+    col->b = bc6_clamp(bc6_finalize(b, sign));
 }
 
 static void