On photo shop cs2 is there a way to filter a color so when using paint brush it doesn't delete a sertian color?

the color is :


r:65


g:57


b:140





basically the same color as a blue penOn photo shop cs2 is there a way to filter a color so when using paint brush it doesn't delete a sertian color?
Use any of the selection tools to select the color you want to protect, then invert the selection. You'll be able to paint over the rest of the image except for the parts you selected.