Making one color stand out in your black and white photos is easier than you think it is. Here is the preview of what we are going to do.
2. Duplicate the original layer.
3. Select the duplicated layer, then click Image > Adjustments > Desaturate. This will turn your duplicated layer into black and white.
4. On this picture, I would only like the red in the Canadian flag to stand out. And so, on the black and white duplicated layer, I would select ONLY the area within the flag. You can do this by selecting the PEN tool. Then click on the corners of the flag or on the areas where you want the color to be visible (this may sometimes take a lot of clicking depending on the object you want to select). Zoom into your photo if you must to get the precise area that you want.
5. Once you are done selecting, a shape layer would appear.
6. Go to PATHS (if you don't see this, go to Window then select Paths).With your shape vector mask selected, click on the "Load Path as a Selection" (see below). Then you would notice that your selected area looks like it has been surrounded by marching ants.
7. Go back to LAYERS tab. Delete the Shape layer.
8. Go to Select > Feather. Set feather radius to 5. Then hit delete.
For more samples, please check out my post: RED
Thanks for droppin' by and have a good week ahead!!!