User`s guide

Appendix F:Software Look Up Tables
74 - PShop User’s Guide
The heading is case insensitive and is followed by lines with a single data value
per line. The lookup tables can appear in any order but all three must be present
and must have the correct number of entries and valid data.
RGB to RGB:
This is a 768 entry table used to map the value of a 24-bit RGB pixel into another
RGB pixel. Each line contains a decimal value in the range of 0 through 255. The
first 256 entries map the red component of the source pixel into the destination
pixel's red component, the next 256 entries map the green component of the
source pixel into the destination pixel's green component, and the last 256 entries
map the blue component of the source pixel into the destination pixel's blue
component.
Gray to Gray:
This is a 256 entry table used to map the value of an 8-bit gray pixel into another
8-bit gray pixel. Each line contains a decimal value in the range of 0 through 255
into a destination value of 0 through 255.
Gray to RGB:
This is a 768 entry table used to map the value of an 8-bit gray pixel into an RGB
pixel. Each line contains a decimal value in the range of 0 through 255. The first
256 entries map gray values 0 through 255, into red, the next 256 entries map
gray value into its green component, and the last 256 entries map the gray value
into its blue component.
Comment lines:
Lines that begin with '#' are comment lines and are ignored, except for the version
line at the head of the file.
Formatting errors:
If the table does not contain the required number of entries or the entry is out of
range an error is reported and the image will not print.
Miscellaneous:
Note that some printers have the ability for hardware calibration. Their internal
state can be calibrated by specialized procedures.