Script writing - help request

["titrisol" <titrisol@xxxxxxxxx>]

I'm trying to write a very specific script for an application which
requires colorimetric measurmeents in the lab.
The image contains a back-light and 2 samples of different colors.
The digi-cam is fixed so the location of those 3 elements remains
constant.

What the script needs to do is:
- measure the value of an area of about 20 pixels -> RGB values
- make that the WHITE value, i.e. adjust the levels of each color to a
maximum given by the RGB values above
- Measure RGB values in 2 other locations that will be my colorimetric
measurements (sample-average 20 pixels is fine).

Can anyone give me a hand with this?
I have written a draft version but doesn't seem to work.

Thanks




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