I am trying to make a water mask for my 2D tile world. I have my base image tiles that look great for land, the water tiles less so. I'm currently loading another set of tiles, a water mask (land is transparent, water is white) and layering it on top of the base image tiles. This works great, though now the water is all white.
I would like to make the water look blue instead of white, so I'd like to change any all-white (or any non-transparent) tile in the water mask tile set to be all blue instead. How can I do this?