synctiles: use default rendering intent from slide ICC profile

ICC profiles don't necessarily support all rendering intents, and aren't necessarily optimized for all the intents they do support. They can also be queried for the rendering intent recommended by the profile creator. Use that instead of absolute colorimetric. xref openslide/openslide-python#227 Signed-off-by: Benjamin Gilbert <[email protected]>
openslide · Oct 8, 2023 · 44438d5 · 44438d5
1 parent 52a83d7
commit 44438d5
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/demo/_synctiles.py b/demo/_synctiles.py
@@ -59,7 +59,6 @@
 TILE_SIZE = 510
 OVERLAP = 1
 LIMIT_BOUNDS = True
-RENDERING_INTENT = ImageCms.Intent.ABSOLUTE_COLORIMETRIC
 GROUP_NAME_MAP = {
     'Generic-TIFF': 'Generic TIFF',
     'Hamamatsu': 'Hamamatsu NDPI',
@@ -103,8 +102,9 @@ def get_transform(image):
     """Return a function that transforms an image to sRGB in place."""
     if image.color_profile is None:
         return lambda img: None
+    intent = ImageCms.getDefaultIntent(image.color_profile)
     transform = ImageCms.buildTransform(
-        image.color_profile, SRGB_PROFILE, 'RGB', 'RGB', RENDERING_INTENT, 0
+        image.color_profile, SRGB_PROFILE, 'RGB', 'RGB', intent, 0
     )
     def xfrm(img):
         ImageCms.applyTransform(img, transform, True)