Kathy, there might be an easier way to do this. I used Photoshop Elements with a levels layer. I slid the green and blue to zero and left the red alone. I'm not sure how I would make a yellow monochrome image or some hue that is not on a channel of the color space, like aqua or something. Do you have an suggestions? @randystreat
@tdaug80 Cool shot. I like the close up of the soldiers. Are they chess pieces? It's been a long time since I used PE. Adobe kept upgrading it. I'm not very good at photoshop and would have had to do something like you did. And, I probably would have had to look it up on Google to find out how to do it.
