icclib/icclu
Summary
Lookup individual color values through any ICC profile table, either
interactively, or as a batch.
Usage summary
icclu [-v level] [-f func] [-i intent] [-o order] profile
-v
Verbose
-f function f = forward, b = backwards, g =
gamut, p = preview
-i intent p =
perceptual, r = relative colorimetric,
s = saturation, a = absolute
-p oride x =
XYZ_PCS, l = Lab_PCS, y = Yxy,
-o order n = normal
(priority: lut > matrix > monochrome)
r = reverse (priority: monochrome > matrix >
lut)
-s scale
Scale device range 0.0 - scale rather than 0.0 - 1.0
The colors to be translated should be fed into standard input,
one input color per line, white space separated.
A line starting with a # will be ignored.
A line not starting with a number will terminate the program.
Flags and Parameters
The -v flag enables more verbose output.
The -f flag selects which type of table or conversion is to be
used.
The -i flag selects the intent for a lut based profile.
Normally the native PCS (Profile Connection Space) of a device or
abstract profile is used, but the -p flag
allows this to be overridden, and XYZ, L*a*b* or Yxy space to be used.
A profile is allowed to contain more than the minimum number of
elements or table needed to
describe a certain transform, and may contain redundant descriptions.
By default, lut based
table information will be used first if present, followed by
matrix/shaper information, and
only using monochrome information if it is all that is present. The -o
flag, reverses this order.
Usually device values are processed and displayed using a normalized
value range between 0.0 and 1.0
Sometimes other systems scale them to some other range (such as 100 or
255) due to an underlying
binary representation. The -s
flag lets you input and display such data in its normal range. For
instance,
if your device values have a range between 0 and 255, use -s 255.
Usage Details and Discussion
Typical usage for an output profile might be:
icclu -ff -ip profile.icm
Normally the program is interactive, allowing the user to type in input
color values, each number separated by a space, and the resulting
output
color being looked up and displayed after pressing return. To batch
process
a group of color values, prepare a text file containing each input
value on
a separate line, and use the input indirection facilities of your
command
line shell to redirect this input file into the standard input of
icclu.
The output can be captured to a file by redirecting standard output to
a file. In most shells this would be done something like this:
icclu -ff -ip profile.icm < inputvalues.txt >
outputvalues.txt