babl r360 - in trunk: . babl

[martinn svn gnome org]

Author: martinn
Date: Wed Jan 14 19:39:56 2009
New Revision: 360
URL: http://svn.gnome.org/viewvc/babl?rev=360&view=rev

Log:
* babl/babl.h (BABL_ALPHA_THRESHOLD): Instead of an arbitrary
threshold, use one hundredth of the channel intensity resolution
when using 16 bit integers i.e. 0.01 / (2^16 - 1).


Modified:
   trunk/ChangeLog
   trunk/babl/babl.h

Modified: trunk/babl/babl.h
==============================================================================
--- trunk/babl/babl.h	(original)
+++ trunk/babl/babl.h	Wed Jan 14 19:39:56 2009
@@ -46,9 +46,11 @@
 #define BABL_MAGIC   0xbAb100
 
 /* Alpha threshold used in the reference implementation for
- * un-pre-multiplication of color data.
+ * un-pre-multiplication of color data:
+ *
+ * 0.01 / (2^16 - 1)
  */
-#define BABL_ALPHA_THRESHOLD 0.0001
+#define BABL_ALPHA_THRESHOLD 0.000000152590219
 
 enum {
   BABL_INSTANCE = BABL_MAGIC,