sharara 0 Newbie Poster

hello.

i was working on adobe photoshop. i need to merge 2 images in one in such a manner that one image will superimpose the another image. and the resultant image will have the colour different from either of the two.

image 1: a complete image.
image 2: some things r missing from image one.

i want that when i superimpose both of them, the matching objects in these 2 images should have some different colours.

i did it by bring image 2 in the second layer of the image 1. then i set the opacity on image 2 and merged 2 images. but i am not getting very sharp image.

any other solution?? pl help!