Hi Mike, thanks for your comments.
Quote:
Can you tell us more about the vb application you wrote?
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I couldn't get Netpbm tools to run on my PC so I wrote a little VB app to split bitmaps into separate colour channels.
The interface is simple - just select the folder where the bitmaps reside and RGBSplit will split each 24 bit colour bitmap in that directory into three files (one for each colour) and write them back to the same directory with the postfix R_, G_, or B_ and the original filename.
Being a Visual Basic app it is a bit slow, but I found if I just do the best colour images (eg 100) it is quick enough for my purposes.