Which is the best way to compare images?

hi all,
My question is that if i want to compare two images in midp2.0 and obtain perceptual diff. between those two images,then what should i do?where to start with?pixel-by-pixel comparison or any othere approach i should use?please guide me through this.

hi gnat,
finaly i have thought a approach just tell me that how efficient it will be,
Say We Have To images,among which first is a base image and the other image is an image to which we are comparing our base image.
1.first of all i am gointg to obtain Red,green,blue And alpha values for both image using getRGB() function and then store those values in integer arrays.
2.after doing this i am going to buil a compar() function,in which
say,r1 is the array of red values for all pixels in image1(baseimage) and r2 is the array of red values for all pixels in image2.
so what i m going to do in compare() function is substract each values of r1 from each values of r2,(r1-r2).
and assign a percentage based on the difference (r1-r2).and do the same for green values and blue values.so is it ok or not?

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