--- a/Image.st	Mon Feb 16 14:22:47 2009 +0100
+++ b/Image.st	Tue Feb 17 11:51:05 2009 +0100
@@ -4135,8 +4135,9 @@
 asGrayImageDepth:depth
     "get a gray image from the receiver"
 
-    (self colorMap notNil and:[depth == self depth]) ifTrue:[
-	^ self copyWithColorMapProcessing:[:clr | Color brightness:(clr brightness)].
+    ((self colorMap notNil and:[depth == self depth]) 
+    or:[ self depth >= 8 "do need for dither" ]) ifTrue:[
+        ^ self copyWithColorMapProcessing:[:clr | Color brightness:(clr brightness)].
     ].
     ^ self asGrayImageDepth:depth dither:DitherAlgorithm.
 
@@ -14067,7 +14068,7 @@
 !Image class methodsFor:'documentation'!
 
 version
-    ^ '$Header: /cvs/stx/stx/libview/Image.st,v 1.418 2008-12-22 14:33:22 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libview/Image.st,v 1.419 2009-02-17 10:51:05 sr Exp $'
 ! !
 
 Image initialize!