picture formats

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Is there a place we can get the specs of the common pic formats, like .jpg, 
 .gif, .bmp, .png, so we can manipulate them with code we write? I'd like to be 
 able to "read" the colors in certain places, stretch or compress the pics on 
 either axis, and overlay two or more pics. Overlaying would mean i will need 
 to do color changing as well. Being able to pick out text in the pics would be 
 really nice too, as well as discern lines. I am thinking of a application on a 
 windoze box, using IE to display the resulting pic file. All i saw in the 
 archives is .xmp, .jpg, and .bmp readers, and wouldn't you know it, the one 
 pic i am sure i want to read is a .jif.

Kat

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