I made a file to help with painting your biomes.png and splat map for making custom maps In Photoshop.
I made the file size for 8192x8192 but you can resize the canvas to whatever you need.
Instructions are in the first layer of the file.
Features:
-Automatic Dithering for biomes
-Automatic Gravel around roads.
Download Link:
http://s000.tinyupload.com/download.php?file_id=14477152909620756480&t=1447715290962075648076533
I made the file size for 8192x8192 but you can resize the canvas to whatever you need.
Instructions are in the first layer of the file.
Features:
-Automatic Dithering for biomes
-Automatic Gravel around roads.
Download Link:
http://s000.tinyupload.com/download.php?file_id=14477152909620756480&t=1447715290962075648076533