1CMAP(5) File Formats Manual CMAP(5)
2
6 cmap - format of .cmap files (color maps)
7
10 Color-map files define the mapping between eight-bit color numbers and
11 red, green and blue intensities used for those numbers. They are read
12 by Magic as part of system startup, and also by the :load and :save
13 commands in color-map windows. Color-map file names usually have the
14 form x.y.z.cmapn, where x is a class of technology files, y is a class
15 of displays, z is a class of monitors, and n is a version number (cur‐
16 rently 1). The version number will change in the future if the formap
17 of color-map files ever changes. Normally, x and y correspond to the
18 corresponding parts of a display styles file. For example, the color
19 map file mos.7bit.std.cmap1 is used today for most nMOS and CMOS tech‐
20 nology files using displays that support at least seven bits of color
21 per pixel and standard-phosphor monitors. It corresponds to the dis‐
22 play styles file mos.7bit.dstyle5.
23 Color-map files are stored in ASCII form, with each line containing
25 four decimal integers separated by white space. The first three inte‐
26 gers are red, green, and blue intensities, and the fourth field is a
27 color number. For current displays the intensities must be integers
28 between 0 and 255. The color numbers must increase from line to line,
29 and the last line must have a color number of 255. The red, green, and
30 blue intensities on the first line are used for all colors from 0 up to
31 and including the color number on that line. For other lines, the
32 intensities on that line are used for all colors starting one color
33 above the color number on the previous line and continuing up and
34 through the color number on the current line. For example, consider
35 the color map below:
36 255 0 0 2
38 0 0 255 3
39 255 255 255 256
40 This color map indicates that colors 0, 1, and 2 are to be red, color 3
43 is to be blue, and all other colors are to be white.
44
47 magic(1), dstyle(5)
484th Berkeley Distribution CMAP(5)