Visual Basic - Convert Color Image to greyscale except one color.

Hi,

I have a bit map image (.bmp) image. I want to convert the whole image to grey scale. However set one color not to be converted to its grey scale.
For example I have a color image, I want every color in that image to be converted to it’s greyscale except for the color red. Rgb(255,0,0).
I know there are plenty of activeX controls which will convert a image into grey scale.
Can any one think of a way to convert all colors except one?
The goal is to have the color RED stand out from the greyed out image.

Any help greatly appreciated.