Open the photo, then duplicate it in a second layer.
Convert the second layer to grayscale. To do this click on "Image," "Mode," then "Grayscale."
Select the eraser tool.
Make the brush diameter bigger at first to erase the center of the shirt, then smaller for the edges of the shirt.
Erase the shirts to reveal the red color:
This is the final image:
This "Digital corner" is published in the December issue of Scrapbooking.com.