Initial version of imgcheck.

PIL is failing to extract color tables from some images.  
This needs to be investigated.

data/tools/imgcheck

@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+"""
+imgcheck - check a sequence of images for exiguous colors
+
+usage: imgcheck baseframe imgframe...
+
+In a sequence of images, treat the first as a baseframe and the rest
+as animation images.  Report on colors not present in the baseframe.
+
+The Python Imaging Library must be available for this tool to work
+"""
+
+import sys, Image
+
+# Extract a color table list from the images 
+colortables = []
+for filename in sys.argv[1:]:
+    img = Image.open(filename).convert("RGB")
+    colortable = img.getcolors()
+    if colortable:
+        colortables.append([filename, colortable])
+    else:
+        print "imgcheck: %s has no color table" % filename
+    #img.close()
+
+# Perform cxolor table subtraction
+basecolors = map(lambda (n, rgb): rgb, colortables[0][1])
+basecolors.sort()
+subtracted = []
+for i in range(1, len(colortables)):
+    exiguous = []
+    for (n, rgb) in colortables[i][1]:
+        if rgb not in basecolors:
+            exiguous.append((n, rgb))
+    exiguous.sort(lambda (an, argb), (bn, brgb): cmp(argb, brgb)) 
+    subtracted.append((colortables[i][0], exiguous))
+
+print "Base colors:"
+print basecolors
+for (filename, colors) in subtracted:
+    print filename + ":"
+    for (n, rgb) in colors:
+        print `rgb` + " * " + `n`
+
+    
+
+    
+