Nieminen Mika wrote:
> 
>   I made this image using that technique (ie. calculated frames and averaged
> them): http://www.iki.fi/warp/pics/Takeoff.jpg
>   DTA was unable to handle 40 640x480 pictures. I had to make a little program
> to average the images. Maybe I'll post the program here if someone explains
> me the uncompressed targa format (I converted the images to raw format with
> alchemy for my program).
>   Man, it was slow to calculate 40 images! (1h 39min per image in my 486 66MHz)

Go straight to the horse's mouth

ftp://ftp.truevision.com/pub/TGA.File.Format.Spec/

Simple answer:
18 byte header
+ 0-255 bytes of additional info (rarely used)
+ palette if present
+ pixels.

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