Image transformation

[G.G.]

Hello everyone, i have idea to create lisp for tranformating image with polynomial tranformation, but the biggest problem is how to change image (tiff, jpg, gpeg, ... ) properties.
From that i know every pixel have (X, Y) coordinates.
How can i chage this coordinates, for the start every X = X*0.1, and Y = Y*1.1 somethin like the.
For the part with polynomial tranformation, once i created C# code, which work perfect, and if someone can create lisp that modify the images the result will be very interesting, mostly for testing.

Thank you everyone.