Colors / water will all change greatly with the texture. What I do is make the colors one layer for each region (continent), then get a monochromatic texture (no color) and paste it on top of that layer. But then I use Fuzzy select in Gimp (U key) or color select tool (Shitf+O), pick the color layer, and with either of those tools, select the continent you are currently working on - this should create a mask of exactly that continent.
Then go back to the texture layer. Under Select drop down menu, select invert (ctrl+I) in gimp. This flips the selected area. Hit Delete, and it will create a perfect layer of texture for that continent.
Then you can play with opacity / and blend Mode (right above opacity) until the texture looks good. THEN you can go back to the color layer, and go to Colors drop down menu, and pick colorize or hue saturation lightness tools. And use these to finalize your color.
If you want more or less of the overlayed texture to show, select the texture layer, and under colors drop down menu, select brightness contrast tool. Increase contrast, and make darker for more texture. Do the opposite for less texture.
Colors / water will all change greatly with the texture. What I do is make the colors one layer for each region (continent), then get a monochromatic texture (no color) and paste it on top of that layer. But then I use Fuzzy select in Gimp (U key) or color select tool (Shitf+O), pick the color layer, and with either of those tools, select the continent you are currently working on - this should create a mask of exactly that continent.
Then go back to the texture layer. Under Select drop down menu, select invert (ctrl+I) in gimp. This flips the selected area. Hit Delete, and it will create a perfect layer of texture for that continent.
Then you can play with opacity / and blend Mode (right above opacity) until the texture looks good. THEN you can go back to the color layer, and go to Colors drop down menu, and pick colorize or hue saturation lightness tools. And use these to finalize your color.
If you want more or less of the overlayed texture to show, select the texture layer, and under colors drop down menu, select brightness contrast tool. Increase contrast, and make darker for more texture. Do the opposite for less texture.