How to convert a Grey Scale image to RGB in C#?

Question

How to convert a Grey scale image to RGB format? I have added Aforge library too but unable to define thresholds for coloring.

Answer 1

I'm not understand clearly what do you mean under Convert gray scale image to RGB and suppose that you are trying to revive colors. Unfortunately it's not possible to do it precisely. I mean you can revive colors from grayscale image but this colors would not exactly the colors was befor transforming to gray. Standard transformation from color to grayscale assumes that every pixel of image transformed by formula:

G(R,G,B) = 0.299*R + 0.587*G + 0.114*B

where R, G and B are RGB values of pixel

As you understand reverse that transformation may have many different results. Look at http://en.wikipedia.org/wiki/Grayscale for more info.

You also may take a look at this project. It implements solution that makes attempt to revitalize colors from grayscale image. But again, take im mind that this colors would not be an original colors