Restore orignal colors to the processed image

hi, i have a human image...in order to extract face from the image i have to convert it to gray image... my question is, after completing my processing that is to extract face....how can i convert the output image back to its original colors....??

Answer 1

[David Sanchez]

you can't. With every process of your image you loose information. When you grayscale (1D matrix) an colour image (3D matrix), you are loosing colour information.

[waqas pervaiz]

is it possible that if i overlap the original (input) image and the output image..after comparing the pixels of output image get replaced by the original (input) image pixels.... just a thought i am not sure if this is possible or not ?