fix limited range scaling for chroma components in HDR RGB to YCbCr c…

…onversion
strukturag · Dec 20, 2022 · 643ca81 · 643ca81
1 parent 1abe388
commit 643ca81
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/libheif/heif_colorconversion.cc b/libheif/heif_colorconversion.cc
@@ -2881,8 +2881,8 @@ Op_RRGGBBxx_HDR_to_YCbCr420::convert_colorspace(const std::shared_ptr<const Heif
       float cr = r * coeffs.c[2][0] + g * coeffs.c[2][1] + b * coeffs.c[2][2];
 
       if (!full_range_flag) {
-        cb = cb * 0.85547f;  // 0.85547 = 219/256
-        cr = cr * 0.85547f;  // 0.85547 = 219/256
+        cb = cb * 0.8750f;  // 0.8750 = 224/256
+        cr = cr * 0.8750f;  // 0.8750 = 224/256
       }
 
       out_cb[(y / 2) * out_cb_stride + (x / 2)] = clip_f_u16(halfRange + cb, fullRange);