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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>xicclu</title>
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
<meta name="author" content="Graeme Gill">
</head>
<body>
<h2><b>xicc/xicclu</b> </h2>
<h3>Summary <br>
</h3>
Lookup individual color values forward or inverted though an ICC
profile table or CAL file. <b>xicclu</b> is the analogue of the
icclib tool <a href="icclu.html">icclu</a>, but expands the
capability to reverse lookup the Lut tables, and displaying PCS
values in CIECAM02 Jab space. <b>xicclu</b> can also be used to
plot the device value composition down the neutral axis for device
profiles, or CAL file contents.<br>
<br>
Few of the options that apply to ICC profiles apply to CAL files,
although device value options such as <b>-e</b> or <b>-E</b> will
work. To lookup inverted CAL values, use <b>-f b</b>.<br>
<h3>Usage Summary</h3>
<small><span style="font-family: monospace;">xicclu [-</span><i
style="font-family: monospace;">options</i><span
style="font-family: monospace;">] profile_or_cal</span><br
style="font-family: monospace;">
<span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#v">-v level</a><span
style="font-family: monospace;">
Verbosity level 0 - 2 (default = 1)</span><br
style="font-family: monospace;">
<span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#g">-g</a><span
style="font-family: monospace;">
Plot slice instead of looking colors up. (Default
white to black)<br>
<a href="#Gs">-G s:L:a:b</a>
Override plot slice start with Lab or Jab co-ordinate<br>
<a href="#Ge">-G e:L:a:b</a>
Override plot slice end with Lab or Jab co-ordinate<br
style="font-family: monospace;">
</span><span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#f">-f function</a><span
style="font-family: monospace;"> f = forward,
b = backwards, g = gamut, p = preview</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
if
=
inverted forward, ib = inverted backwards</span><br
style="font-family: monospace;">
<span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#i">-i intent</a><span
style="font-family: monospace;"> a
= absolute, r = relative colorimetric,</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
</span></small><small><span style="font-family: monospace;"> p =
perceptual, </span></small><small><span style="font-family:
monospace;">s = saturation</span><span style="font-family:
monospace;"></span><br style="font-family: monospace;">
<span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#o">-o order</a><span
style="font-family: monospace;">
n = normal (priority: lut > matrix > monochrome)</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
r
=
reverse (priority: monochrome > matrix > lut)</span><br
style="font-family: monospace;">
<span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#p">-p oride</a><span
style="font-family: monospace;">
x = XYZ_PCS, X = XYZ * 100, l = Lab_PCS, L = LCh, y = Yxy,<br>
j =
CIECAM02 Appearance Jab, J = CIECAM02 Appearance JCh<br>
</span><span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#s">-s scale</a><span
style="font-family: monospace;">
Scale
device range 0.0 - scale rather than 0.0 - 1.0<br>
</span></small><br>
<small><span style="font-family: monospace;"><small><span
style="font-family: monospace;"><a href="#e">-e flag</a>
Video encode device input as:<br>
<a href="#E">-E flag</a>
Video decode device output as:<br>
n
normal 0..1 full range RGB levels (default)<br>
t
(16-235)/255 "TV" RGB levels<br>
6
Rec601 YCbCr SD (16-235,240)/255 "TV" levels<br>
7
Rec709 1125/60Hz YCbCr HD (16-235,240)/255 "TV" levels<br>
5
Rec709 1250/50Hz YCbCr HD (16-235,240)/255 "TV" levels<br>
2
Rec2020 YCbCr UHD (16-235,240)/255 "TV" levels<br>
C
Rec2020 Constant Luminance YCbCr UHD (16-235,240)/255 "TV"
lev</span></small></span></small><small><span
style="font-family: monospace;"><br style="font-family:
monospace;">
</span> <span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#k">-k [zhxrlv]</a><span
style="font-family: monospace;"> Black
generation: z = zero K,</span><br style="font-family:
monospace;">
<span style="font-family: monospace;">
h
= 0.5 K, x = max K, r = ramp K (def.)</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
l
= extra PCS input is portion of K locus</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
v
= extra PCS input is K target value</span><br
style="font-family: monospace;">
<span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#kp">-k p stle stpo enpo
enle shape</a><br style="font-family: monospace;">
<span style="font-family: monospace;">
stle:
K level at White 0.0 - 1.0</span><br style="font-family:
monospace;">
<span style="font-family: monospace;">
stpo:
start point of transition Wh 0.0 - Bk 1.0</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
enpo:
End point of transition Wh 0.0 - Bk 1.0</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
enle:
K level at Black 0.0 - 1.0</span><br style="font-family:
monospace;">
<span style="font-family: monospace;">
shape:
1.0 = straight, 0.0-1.0 concave, 1.0-2.0 convex</span><br
style="font-family: monospace;">
<span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#kq">-k q stle0 stpo0
enpo0 enle0 shape0 stle2 stpo2 enpo2 enle2 shape2</a><br
style="font-family: monospace;">
<span style="font-family: monospace;">
Transfer
extra
PCS input to dual curve limits</span><br style="font-family:
monospace;">
<span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#K">-K parameters</a><span
style="font-family: monospace;"> Same as -k, but target is
K locus rather than K value itself</span><br style="font-family:
monospace;">
<span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#l">-l tlimit</a><span
style="font-family: monospace;">
set total ink limit, 0 - 400% (estimate by default)</span><br
style="font-family: monospace;">
<span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#L">-L klimit</a><span
style="font-family: monospace;">
set black ink limit, 0 - 100% (estimate by default)</span><br
style="font-family: monospace;">
<span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#a">-a</a><span
style="font-family: monospace;">
show
actual
target values if clipped<br>
<a href="#b">-b</a>
use
CAM
Jab for clipping<br style="font-family: monospace;">
</span><span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#m">-m</a><span
style="font-family: monospace;">
merge output processing into clut</span><span
style="font-family: monospace;"></span><span style="font-weight:
bold; font-family: monospace;"></span><br style="font-family:
monospace;">
<span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#c">-c viewcond</a><span
style="font-family: monospace;"> set viewing
conditions for CIECAM02,</span><br style="font-family:
monospace;">
</small><small><span style="font-family: monospace;">
either
an enumerated choice, or a parameter:value change</span><span
style="font-family: monospace;"></span><br style="font-family:
monospace;">
<span style="font-family: monospace;"></span></small><small><span
style="font-family: monospace;">
pp - Practical Reflection Print (ISO-3664 P2)</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
pe
- Print evaluation environment (CIE 116-1995)<br>
</span></small><small><span style="font-family: monospace;">
pc
- Critical print evaluation environment (ISO-3664 P1)</span></small><small><span
style="font-family: monospace;"></span><span style="font-family:
monospace;"></span><br style="font-family: monospace;">
<span style="font-family: monospace;">
mt - Monitor in typical work environment</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
mb - Monitor in bright work environment</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
md - Monitor in darkened work
environment</span><br style="font-family: monospace;">
<span style="font-family: monospace;">
jm - Projector in dim environment</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
jd - Projector in dark environment</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
pcd - Photo CD - original scene outdoors</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
ob - Original scene - Bright Outdoors</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
cx - Cut Sheet Transparencies on a
viewing box</span></small><small><span style="font-family:
monospace;"></span><span style="font-family: monospace;"></span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
s:surround
n
= auto, a = average, m = dim, d = dark,</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
c = transparency (default average)</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
w:X:Y:Z
Adapted
white point as XYZ (default media white, Abs: D50)</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
w:x:y
Adapted
white point as x, y</span><br style="font-family: monospace;">
<span style="font-family: monospace;">
a:adaptation
Adaptation
luminance in cd.m^2 (default 50.0)</span><br style="font-family:
monospace;">
<span style="font-family: monospace;">
b:background Background % of
image luminance (default 20)</span><br style="font-family:
monospace;">
<span style="font-family: monospace;"></span></small><small><span
style="font-family: monospace;"><small><span style="font-family:
monospace;">
f:flare
Flare
light
% of image luminance (default 1)<br>
</span></small>
g:glare Glare light % of ambient
(default 2)</span><br style="font-family: monospace;">
<span style="font-family: monospace;">
g:X:Y:Z Glare color
as XYZ (default media white, Abs: D50)</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
g:x:y FGare color as
x, y</span><br style="font-family: monospace;">
<br style="font-family: monospace;">
<span style="font-family: monospace;"> </span><a
style="font-family: monospace;" href="#p1"><i>inoutfile</i></a><span
style="font-family: monospace;"> The
input ICC profile or CAL file.</span><br style="font-family:
monospace;">
<br style="font-family: monospace;">
<span style="font-family: monospace;"> The
colors to be translated should be fed into standard in,</span><br
style="font-family: monospace;">
<span style="font-family: monospace;"> one input
color per line, white space separated.</span><br
style="font-family: monospace;">
<span style="font-family: monospace;"> A line
starting with a # will be ignored.</span><br style="font-family:
monospace;">
<span style="font-family: monospace;"> A line
not starting with a number will terminate the program.</span></small>
<br>
<h3>Flags and Parameters</h3>
<a name="v"></a> The <b>-v</b> parameter sets the level of
verbosity. Default is level 1, which repeats each input value, the
colorspaces of input and output, the type of conversion algorithm
used, and if the result was clipped. Level 2 adds prints extra
information about the profile before doing the conversions. Level 0
turns off all verbosity, just outputting the results of each
conversion. Use the latter to capture batch output ready for further
processing.<br>
<br>
<a name="g"></a>The <b>-g</b> flag causes a plot of the device
values along a slice through the Lab or Jab colorspace, rather than
allowing the interactive looking up of color values. By default this
will be the neutral axis from the white point to the black point,
but the start and end can be overridden using the <span
style="font-weight: bold;">-G</span> parameters. This is useful in
determining the existing black generation in a CMYK profile, or
exploring the behavior of various black generation options using the
<b>-k</b> parameters. The profile must be a device profile, and the
PCS must be either Lab or Jab. The default plot is up the neutral
axis is from the white to the black point (scale 0 to 100%), and
shows the percentage of each device colorant. To examine a profiles
B2A table black generation, use the flag <b>-fb</b> to select the
B2A table, or to invert the A2B table, and be able to explore black
generation behavior, use the <b>-fif</b> flag. The appropriate
intent can be selected with the <b>-i</b> flag, as can other
flags appropriate to the function selected. See <a href="#xg">example</a>.<br>
<br>
If a CAL file is used, then <b>-g</b> will simply plot the each
channels calibration curve. It will also plot the invers curve for <b>-f
b</b>.<br>
<br>
<a name="Gs"></a>The <span style="font-weight: bold;">-G </span><small><span
style="font-family: monospace;"><span style="font-weight: bold;">s:L:a:b</span></span></small>
parameter overrides the plot slice start point of white, with some
other point specified in Lab or Jab Profile Connection Space. The
parameter must be a single string that combines<span
style="font-weight: bold;"> s:</span> with the three numbers
separated by the '<span style="font-weight: bold;">:'</span>
character (no spaces).<br>
<br>
<a name="Ge"></a>The <span style="font-weight: bold;">-G </span><small><span
style="font-family: monospace;"><span style="font-weight: bold;">e:L:a:b</span></span></small>
parameter overrides the plot slice end point of black, with some
other point specified in Lab or Jab Profile Connection Space. The
parameter must be a single string that combines<span
style="font-weight: bold;"> s:</span> with the three numbers
separated by the '<span style="font-weight: bold;">:'</span>
character (no spaces).<br>
<br>
<a name="f"></a> The <b>-f</b> flag selects which type of table or
conversion is to be used. In addition to the usual four tables that
can be accessed in a fully populated Lut based profile, two
additional options are available in <b>xicclu</b>. One is to invert
the forward table, and the other is to invert the backward table.
For non Lut based profiles, -fif is equivalent to -fb, and -fib is
equivalent to -ff. Note that the -fib combination may not be fully
supported.<br>
<br>
<a name="i"></a> The <b>-i</b> flag selects the intent table used
for a lut based profile. It also selects between relative and
absolute colorimetric for non-lut base profiles.<br>
<br>
<a name="o"></a> 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 <b>-o</b> flag, reverses this
order. <br>
<br>
<a name="p"></a> Normally the native PCS (Profile Connection Space)
of a device or abstract profile is used, but the <b>-p</b> flag
allows this to be overridden: <span style="font-weight: bold;">-px</span>:
XYZ (scaled to 1.0), <span style="font-weight: bold;">-pX</span>:
XYZ scaled to 100, <span style="font-weight: bold;">-pl</span>:
L*a*b*, <span style="font-weight: bold;">-pL</span>: LCh, <span
style="font-weight: bold;">-py</span>: Yxy space, <span
style="font-weight: bold;">-pj</span>: CIECAM02 appearance space
Jab, or <span style="font-weight: bold;">-pJ</span>: CIECAM02
appearance space JCh.<span style="font-weight: bold;"><br>
</span>Note that the CIECAM02 output space selection by default uses
the colorimetric table of the profile, but that the perceptual or
saturation tables may be used by selecting them using the <span
style="font-weight: bold;">-i</span> parameter. If the absolute
colorimetric intent is chosen using <span style="font-weight:
bold;">-ia</span> in combinations with <span style="font-weight:
bold;">-pj</span>, then Jab with a fixed white reference is
used, which emulates an absolute CIECAM02 Jab appearance space. <br>
<br>
<a name="s"></a> 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 <span style="font-weight:
bold;">-s</span> 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 <span style="font-weight: bold;">-s 255.</span><br>
<br>
<a name="e"></a>The <b>-e</b> <i>flag</i> applies a Video encoding
to the input. See <a
href="collink.html#E"><b>-E</b></a> for
the list of encodings.<br>
<br>
<b><a name="E"></a></b>The <b>-E</b> <i>flag</i> applies a Video
encoding to the output. The possible encoding are:<br>
<br>
<small><span style="font-family: monospace;"><small><span
style="font-family: monospace;">
n
normal RGB 0..1 full range levels (default)<br>
t
RGB (16-235)/255 "TV" levels<br>
6
Rec601 YCbCr SD (16-235,240)/255 "TV" levels<br>
7
Rec709 1125/60Hz YCbCr HD (16-235,240)/255 "TV" levels<br>
5
Rec709 1250/50Hz YCbCr HD (16-235,240)/255 "TV" levels<br>
2
Rec2020 YCbCr UHD (16-235,240)/255 "TV" levels<br>
C
Rec2020 Constant Luminance YCbCr UHD (16-235,240)/255 "TV"
levels<br>
</span></small></span></small><br>
<a name="k"></a> When inverting a CMYK profile, (ie. using the -fif
flag), an input PCS value can have many possible CMYK solutions. To
be able to return a unique solution, a black level (or black inking
rule) should be chosen. The choice here reflect similar choices in
black generation available in other tools (eg. <a
href="colprof.html">colprof</a>, <a href="collink.html"> collink</a>),
with the addition of two extra options.<br>
<br>
Possible arguments to the <b>-k</b> option are:<br>
<br>
<b> -kz</b> selects minimum black (0.0)<br>
<b> -kh</b> selects a black value of 0.5<br>
<b> -kx</b> selects the maximum possible black (1.0)<br>
<b> -kr</b> selects a linear black ramp, starting at minimum black
for highlight, and maximum black for shadow (equivalent to -kp 0 0 1
1 1). This is the default.<br>
<b> -kl</b> uses an extra (fourth) value entered after the input PCS
value, to select a black locus target between 0.0 and 1.0.<br>
<b> -kv</b> uses an extra (fourth) value entered after the input PCS
value, to select a black value target value between 0.0 and 1.0.<br>
<br>
<b><a name="kp"></a>-k p stle stpo enpo enle shape</b> allows
an arbitrary black value ramp to be defined, consisting of a
starting value (stle) for highlights, a breakpoint L value (stpo)
where it starts to transition to the shadow level, an end breakpoint
L (enpo) where it flattens out again, and the finishing black level
(enle) for the shadows. There is also a curve parameter, that
modifies the transition from stle to enle to either be concave
(ie. the transition starts gradually and and finished more
abruptly) using values 0.0-1.0, with 0.0 being most concave, or
convex (the transition starts more abruptly but finishes gradually),
using values 1.0-2.0, with 2.0 being the most convex.<br>
<br>
Typical black value generation curve with parameters something like:
-kp 0 .05 1 .9 .8<br>
<br>
<tt> 1.0 K |
enpo<br>
|
_______ enle<br>
|
/<br>
|
/<br>
|
/<br>
|
/<br>
stle | ------/<br>
+-------------------<br>
0.0 K
0.0
stpo 1.0<br>
White
Black<br>
</tt><br>
<b><a name="kq"></a>-k q stle0 stpo0 enpo0 enle0 shape0 stle2 stpo2
enpo2 enle2 shape2</b> is a combination of the <b>-kv</b> and <b>-kp</b>
functionality, with the black being preserved in CMYK to CMYK
linking, with the output black constrained to be between the first
and second set of curve parameters.<br>
<br>
<a name="K"></a> <span style="font-weight: bold;">-K parameters.</span>
Any of the <span style="font-weight: bold;">-k</span> options above
can use the <span style="font-weight: bold;">-K</span> version, in
which rather than a black value target being defined by the inking
rule, a black <span style="text-decoration: underline;">locus</span>
target is defined. For each lookup, the minimum possible black level
and the maximum possible black level is determined, the former
corresponding to a locus target of 0, and the latter corresponding
to a locus target of 1. For instance, at the white point, no black
will be used in the output, even if the black locus specifies a
maximum (since the maximum amount of black that can be used to print
white is actually zero). Similarly, at the black point, black may
well be used, even if the black locus specifies zero black (since a
certain amount of black is needed to achieve the desired density of
color). <br>
<tt> </tt><span style="text-decoration: underline;"></span><br>
The <b>-g</b> flag can be used together with the <b>-fif</b>
flag, to plot out the resulting black channel behaviour for various
<b>-k</b> or <span style="font-weight: bold;">-K </span>parameter
values.<br>
<br>
<b><a name="l"></a>-l</b> <i>tlimit</i> Sets the
total ink limit (TAC, Total Area Coverage) for the CMYK inverse
forward lookup, as a total percentage from 0% to 400%. If none is
provided, it will be estimated from the profile relcolor B2A table.
The ink limit will be in final calibrated device values if the
profile includes calibration information.<br>
<br>
<b><a name="L"></a>-L</b> <i>klimit</i> Sets the black
ink limit for the CMYK inverse forward lookup, as a total percentage
from 0% to 100%. If none is provided, it will be estimated from the
profile relcolor B2A table. The ink limit will be in final
calibrated device values if the profile includes calibration
information.<br>
<br>
<a name="a"></a> If the <b>-a</b> flag is used for inverse forward
lookups, then if the target PCS value cannot be reproduced by the
device (ie. it clips), then the achievable, clipped PCS value is
displayed.<br>
<br>
<a name="b"></a> If the <b>-b</b> flag is used for inverse forward
lookups, then out of gamut clipping will be performed in the
CIECAM02 Jab appearance colorspace, rather than L*a*b* colorspace.<br>
<br>
<a name="m"></a> The <b>-m</b> flag turns on an internal processing
option, in which the per device curve lookup table processing is
merged into the main multi-dimensional interpolation lut lookup.<br>
<br>
<a name="c"></a>Whenever PCS values are to be specified or displayed
in Jab/CIECAM02 colorspace, a set of viewing conditions will be used
to determine the details of the conversion. The <b>-c</b> parameter
allows the specification of the viewing conditions. Viewing
conditions can be specified in two basic ways. One is to select from
the list of "pre canned", enumerated viewing conditions, choosing
one that is closest to the conditions that are appropriate for the
media type and situation. Alternatively, the viewing conditions
parameters can be specified in detail individually. If both methods
are used, them the chosen enumerated condition will be used as a
base, and its parameters will then be individually overridden.<br>
<br>
<a name="p1"></a> The final parameter is the name of the <a
href="File_Formats.html#ICC">ICC</a> profile to be used. On the
MSWindows platform a .icm extension is generally used, and on Apple
or Unix/Linux platforms a .icc extension is often used.<br>
<h3>Usage and Discussion</h3>
Typical usage for an output profile might be:<br>
<br>
xicclu -ff -ip profile.icm<br>
<br>
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 xicclu. 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:<br>
<br>
xicclu -ff -ip profile.icm < inputvalues.txt
> outputvalues.txt<br>
<br>
<a name="xg"></a>When plotting the neutral axis behavior, plotting
the existing B2A table behavior would typically be done something
like this:<br>
<br>
xicclu -g -fb profile.icm<br>
<br>
Exploring possible black generation and ink limiting behavior might
be done like this:<br>
<br>
xicclu -g -fif -kp 0 .1 .9 1 .5 -l230 -L95
profile.icm<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
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