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Diablo 1 TRN File Format - Color Palette Translations

1. Description
2. File structure

1. Description

Diablo 1 color palette translation files use the .trn file extension.
A color palette translation file contains data to translate (i.e. replace) colors from a given color palette file thus building a new variant of the color palette.
Color palette translation files allow rendering CEL/CL2 graphics with different color schemes without building a new full color palette file.

2. File structure

{COLOR TRANSLATION} * 256

Each color translation is one byte.
Each color translation is associated to the color with the same index in the color palette file.

If the color translation value {COLOR TRANSLATION} is equal to its offset {COLOR TRANSLATION OFFSET} then the color is not translated. Thus the following data is a null color palette translation file which does not modify the source color palette file at all:

00 01 02 03 04 05 06 07
08 09 0A 0B 0C 0D 0E 0F
10 11 12 13 14 15 16 17
18 19 1A 1B 1C 1D 1E 1F
20 21 22 23 24 25 26 27
28 29 2A 2B 2C 2D 2E 2F
30 31 32 33 34 35 36 37
38 39 3A 3B 3C 3D 3E 3F
40 41 42 43 44 45 46 47
48 49 4A 4B 4C 4D 4E 4F
50 51 52 53 54 55 56 57
58 59 5A 5B 5C 5D 5E 5F
60 61 62 63 64 65 66 67
68 69 6A 6B 6C 6D 6E 6F
70 71 72 73 74 75 76 77
78 79 7A 7B 7C 7D 7E 7F
80 81 82 83 84 85 86 87
88 89 8A 8B 8C 8D 8E 8F
90 91 92 93 94 95 96 97
98 99 9A 9B 9C 9D 9E 9F
A0 A1 A2 A3 A4 A5 A6 A7
A8 A9 AA AB AC AD AE AF
B0 B1 B2 B3 B4 B5 B6 B7
B8 B9 BA BB BC BD BE BF
C0 C1 C2 C3 C4 C5 C6 C7
C8 C9 CA CB CC CD CE CF
D0 D1 D2 D3 D4 D5 D6 D7
D8 D9 DA DB DC DD DE DF
E0 E1 E2 E3 E4 E5 E6 E7
E8 E9 EA EB EC ED EE EF
F0 F1 F2 F3 F4 F5 F6 F7
F8 F9 FA FB FC FD FE FF

If the color translation value {COLOR TRANSLATION} is different from its offset {COLOR TRANSLATION OFFSET}, then the color with the {COLOR TRANSLATION OFFSET} index in the color palette is replaced by the color with the {COLOR TRANSLATION} index in the color palette.

For example, if the color translation value at offset 0x10 is 0x03, the color with index 0x10 (11th color of the palette) will be replaced by the color with index 0x03 (4th color of the palette).