--- a/Image.st	Thu Feb 23 14:18:00 2017 +0100
+++ b/Image.st	Thu Feb 23 15:55:50 2017 +0100
@@ -14410,16 +14410,19 @@
     ].
 
     photometric == #whiteIs0 ifTrue:[
+        samplesPerPixel isNil ifTrue:[self breakPoint:#cg. samplesPerPixel := 1].
         maxPixel := (1 bitShift:self bitsPerPixel) - 1.
         ^ maxPixel - (color brightness * maxPixel) rounded.
     ].
 
     photometric == #blackIs0 ifTrue:[
+        samplesPerPixel isNil ifTrue:[self breakPoint:#cg. samplesPerPixel := 1].
         maxPixel := (1 bitShift:self bitsPerPixel) - 1.
         ^ (color brightness * maxPixel) rounded.
     ].
 
     photometric == #palette ifTrue:[
+        samplesPerPixel isNil ifTrue:[self breakPoint:#cg. samplesPerPixel := 1].
         colorMap isNil ifTrue:[
             "/ same as blackIs0
             maxPixel := (1 bitShift:self bitsPerPixel) - 1.
@@ -14437,6 +14440,7 @@
     ].
 
     photometric == #rgb ifTrue:[
+        samplesPerPixel isNil ifTrue:[self breakPoint:#cg. samplesPerPixel := 3].
         samplesPerPixel >= 3 ifTrue:[
             redBits := bitsPerSample at:1.
             greenBits := bitsPerSample at:2.
@@ -14452,6 +14456,7 @@
     ].
 
     photometric == #rgba ifTrue:[
+        samplesPerPixel isNil ifTrue:[self breakPoint:#cg. samplesPerPixel := 4].
         samplesPerPixel >= 4 ifTrue:[
             redBits := bitsPerSample at:1.
             greenBits := bitsPerSample at:2.
@@ -14470,7 +14475,7 @@
     ImageErrorSignal raiseErrorString:'format not supported'.
     ^ nil
 
-    "Modified: / 06-06-2007 / 11:26:15 / cg"
+    "Modified: / 23-02-2017 / 15:55:29 / cg"
 !
 
 valueFromRGB:rgb