Postby Chad » Sat May 17, 2014 4:13 am
Open an entire tileset in Paint.NET at once (because it can do a whole bunch of tabs), and then open another graphic that has the colors you want to use. From there, use the color picker on one shade, Tolerance 0, then apply the color to its proper place on each tile in the tileset one by one until you've done it to all of them. It's a process that must be repeated a few times until you've changed every shade, but once you have it set up, the process is basically just "switch tab, click color, switch tab, click color".