SF.net SVN: matplotlib:[8968] trunk/matplotlib/lib/matplotlib/colors.py

[<ef...@us...>]

Revision: 8968
          http://matplotlib.svn.sourceforge.net/matplotlib/?rev=8968&view=rev
Author:   efiring
Date:     2011-02-10 01:21:27 +0000 (Thu, 10 Feb 2011)

Log Message:
-----------
bugfix: handle alpha correctly in colormapping with uint8

Modified Paths:
--------------
    trunk/matplotlib/lib/matplotlib/colors.py

Modified: trunk/matplotlib/lib/matplotlib/colors.py
===================================================================
--- trunk/matplotlib/lib/matplotlib/colors.py	2011-02-09 17:57:14 UTC (rev 8967)
+++ trunk/matplotlib/lib/matplotlib/colors.py	2011-02-10 01:21:27 UTC (rev 8968)
@@ -547,6 +547,8 @@
         if alpha is not None:
             alpha = min(alpha, 1.0) # alpha must be between 0 and 1
             alpha = max(alpha, 0.0)
+            if bytes:
+                alpha = int(alpha * 255)
             if (lut[-1] == 0).all():
                 lut[:-1, -1] = alpha
                 # All zeros is taken as a flag for the default bad


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