In Fallout 2 there are six RIX files. All are in master.dat, in the art\splash folder, and appear when loading the game.
ColorRIX is an outdated graphics editor for VGA and SVGA cards, running under MS-DOS. There were about half a dozen formats, of which Fallout 2 only used one - SCF (renamed RIX). ColorRIX came with some VGA graphics cards and a description of the format can be found on some sites with FTP archives.
This format lets/allows us to save uncompressed images in 640x480 resolution, 256 colors (indexed). It's analogous to the Microsoft Windows Bitmap File format (BMP).
All of the control values it the file are stored in little-endian format. (I.e. least-significant byte first).
| Offset | Size (bytes) | Description |
|---|---|---|
| 0x000 | 4 | "RIX3" - the file signature. |
| 0x004 | 2 | width of the image - example: 0x280 = 640 |
| 0x006 | 2 | height of the image - example: 0x1E0 = 480 |
| 0x008 | 1 | 0xAF = VGA - Palette type. |
| 0x009 | 1 | 0x00 = linear - Storage type. |
| 0x00A | 256*3 = 768 | The palette. 3 bytes per color. |
| 0x30A | 640*480 = 307200 | The image data. 1 byte for each pixel referencing the palette data defined previously. |