A simple explanations of the .tga format

intro: what is tga?

TGA or Targa format is a simple format to store pictures etc etc.
It has a few things that format's like jpg and bmp do not have.
First of all: it support RLE encoding: this is compression, so the files are smaller then BMP.
Second (and most important) it support an alpha channel.
An alpha channel is like an extra color channel except that this one does not specify color but transpirancy.
If a pixel in a tga has a 0 alpha: it is NOT drawn, 128 means it is 50% transparant, and 256 means full opaque.

how can i make a .tga for lbz?

TGA support's many things: but LBZ is limited to a tga file that:
1: uses an alpha channel
2: has 32 bit color
3: has RLE compression
4: has a size like: 128x128 256x256 or 512x512 (these are standard texture sizes)

U can make a valid tga with the following programs:
Paint Shop Pro
Adobe photoshop (some versions require a patch to work)
The Gimp
Just make sure that when u save the .tga that u have the things listed above!