Try creating a sprite that is not 256 colors, but is something higher like 16-bits or better. You can alwasy download GMP for Windows. It is free and will allow you to save in a format that is higher than 256 colors.
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How do I make my own textures? For instance, I want to make a sky texture that's completely black. But I don't know how to compile a wad.
You create your texture in a paint program and save it as BMP, PCX or TGA. You then open your level, open then texture manager, create a new WAD and then you can right-click in the new WAD view area (to the left) and select ADD TEXTURE (I think that is what it is called). Then you can navigate to where your texture is and select it. It will then be added to the new WAD you created. Don't forget to save it (right clicking will in the new WAD area will give you access to the button that allows you to save the new WAD after you have made any changes like adding a new texture to the WAD).
