[plt-scheme] using images in a scheme program

I don't know if I understand what you're trying to achieve, but if you just want to create an arbitrary number based on the image contents, you can apply a checksum to the the image contents.  Try an MD5 [1] or SHA1 hash, or even a CRC.  
  
[1] http://www.scheme.dk/md5 
  
-- 
Gordon Weakliem 
http://www.eighty-twenty.net 
  
  
-----Original Message from Charbonneau Nathalie <nathalie.charbonneau at umontreal.ca>----- 
  
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Hi! 
I would like to have an information. 
I want to assign a numeric value to an image (GIF format). 
When the scheme program would evaluate the image, it would give back the numeric value. 
How can I do it? 

Thank you in advance. 

Nathalie Charbonneau 
Montreal University (Canada)