PAL

Format

The PAL file format is very simple. It is a series of colours, represented by 3 bytes each in the format

   struct colour{
       Uint8 red;
       Uint8 green;
       Uint8 blue;
   };

SHP files refer to an index in this file. 0 is the first colour (3 bytes), which is used as the transparent colour in the SHP file.
Index 1 of a palet file would be bytes 4, 5 and 6.

Each byte only stores 6 bits of data, for example pure red would be represented as "00111111" (in binary) in the red byte.