How to compare two color images?

I need to insert my reference image and the input image i will compare with the reference image. an example my reference image is red, so, whenever i insert red color image it will displays red otherwise it just show black color. can someone help me how to create the coding for this or give some idea.

[KSSV]

Read about masking the images.

Answer 1

[Image Analyst]

Regarding "inserting" images, see my attached demos for copying and pasting an image onto another image.

[syafini alias]

Thanks for your help. but i want to apply this in gui. it is okay?