Landscape Types (prehex sprites & trans)

[dkong]

I am having trouble modding new landscape types (sprites & trans). I bascially use plaintrans.bmp (which is all pink 64x48) tp create my trans files by adding graphics onto them. But when I added them to my custom Landscape type, and draw it on the map...the pink background still shows. I thought pink was suppose to be transparent. Pls help.