In this MCP Blog It Board below, you see that Alyssa is leaning on or peeking through circles and triangles. The metal triangle we found was yellow. The circle red. But for her shots I decided it would be more fun both on a wall and in a collage to mix things up. This is a super easy color change since the object was solid in color.
I used CS4 (but this can be done in earlier versions too). I made a selection of the red metal that formed the border for the circle using the Quick Selection Tool. You could also use the Magic Wand in early versions of Photoshop. Once I had “marching ants” around the selection, I made a new Hue/Saturation Adjustment layer. I went to hue slider and moved the slider left and right until I found a color I liked, or in this case I found a few colors for the various pictures.
In the layers panel you will see that the color is already masked off so it the only thing effected. If anything else was effected, you would use a brush to clean up the layer mask, using black to hide the effect anywhere it over spilled.
This tutorial is so easy to do that I did not make screen shots. Oh course if you have multicolored objects, masking will be more complex. Have fun color changing.