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Convert image to 3 RBG Colors

Hello. I am new to GIMP and I am trying to figure out a way to convert a color image to 3 RBG colors.

I am at work so I do not have access to GIMP so I just am using paint right now, and here is an example I am looking to do (in the image below the original image is still showing through, I am trying to get this image to just 3 RBG colors):

Photobucket

The only way I know how to do this in GIMP is to first choose "Colors>Maximum RBG". This kind of changes it to 3 colors, but the image is still visible. And it also seems to have the colors Yellow and purple in it as well?

I then choose "colors>Components>channel mixer" And go though each color (For example for red channel, set red to 200%, and blue and green to -200%, for green, set green 200% red and blue -200% etc..). This kind of works, in that finally all the areas that are surrounded by red do become solid red. However some of the original image still remains. I then try channel mixer again, and it becomes a bit more solid. Then use it again, and it becomes more solid... etc. It seems I have to do this repeadly for each channel to finally get it to 3 RBG colors.

Is there an easier way to achieve this (via Script or Plugin?). Or is this the proper way to do this, or do you know of an easier way?

Thanks!

Forums: 

You could apply a Gradient Map filter with the "French Flag" gradient (red, white, blue). Then use the Select By Color tool to select the white portions and fill them with green.

Thank you saulgoode! That works perfect!
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