This page will outline how make completely new textures from start to finish. The author of the tutorial is me, Rellik_jmd.
If when reading these, you find what you know to be an error, send mail to us at DER.
COMING SOON:
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There are a few things to keep in mind:
1. First you'll need the DOOM palette to make your new bitmaps. To get the pallette take a screenshot while in doom (software mode). Now open that screenshot up in your graphics editor and save the pallette as whatever you want.
2. To be imported into DOOM the image must be 256 colors and using the DOOM palette.
3. While you can make textures from 1 pixel tall by 4 pixels wide to128 x 2048 pixels wide, wall textures are mainly 128 pixels tall and 64 or 128 pixels wide.
Now with that out of the way you can edit or create textures with any program that lets you edit bitmaps with a specific palette. For information on how to put your images in a wadfile to be used in the game, click Saving / Editing Textures in Wad files.
Another thing to keep in mind is how you'll be using the texture in game levels. If you'll be using it on sections of wall that are of various length, you may want to stay away from vertical lines. They will stick out unless you do a lot of texture aligning. You might be better off to stick with horizontal lines. Here's an example:
Here's some oddly lengthed walls with a texture with a face on it:
See how a bunch of the faces are chopped in half? That looks bad.
Here's the same room with a new texture. While it's a much plainer texture, it tiles nicely which in some situations is definitely prefferable to the first way.
You can have transparent sections in your texture, simply use the cyan color (RGB value of 0,255,255) to fill the 'holes'.