For an IT8.7/2 chart, this is the
ref/it8.cht
file supplied with Argyll, and the manufacturer will will
supply
an
individual or batch average file along with the chart containing
this
information, or downloadable from their web site.
NOTE that the reference file for the IT8.7/2 chart supplied with
Monaco EZcolor can be
obtained
by unzipping the .mrf file. (You may have to make a copy of the
file
with a .zip extension to do this.)
For the ColorChecker 24 patch chart, the
ref/ColorChecker.cht file
should be used, and there is also a
ref/ColorChecker.cie
file provided that is based on the manufacturers reference values
for
the chart. You can also create your own reference file using an
instrument and chartread, making use of the chart reference file
ref/ColorChecker.ti2:
chartread -n -a
ColorChecker.ti2
Note that due to the small number of patches, a profile created
from
such a chart is not likely to be very detailed.
For the ColorChecker DC chart, the
ref/ColorCheckerDC.cht
file
should be used, and there will be a ColorCheckerDC reference
file supplied by X-Rite/GretagMacbeth with the chart.
The ColorChecker SG is relatively expensive, but is preferred by
many
people because (like the ColorChecker and ColorCheckerDC) its
colors
are composed of multiple different pigments,
giving it reflective spectra that are more representative of the
real
world, unlike many other charts that are created out of
combination of
3 or 4 colorants.
A limited CIE reference file is available from X-Rite
here,
but
it
is
not
in
the
usual
CGATS format. To convert it to a CIE
reference file useful for
scanin,
you
will
need
to
edit
the
X-Rite
file using a
plain
text editor, first
deleting everything before the line starting with "A1" and
everything
after "N10", then prepending
this header,
and appending
this footer, making
sure
there are no blank lines inserted in the process.
If you do happen to have access to a more comprehensive instrument
measurement of the ColorChecker SG, or you have measured it
yourself
using a color instrument,
then you
may
need to
convert the reference information from spectral
ColorCheckerSG.txt file to CIE
value
ColorCheckerSG.cie
reference file,
follow the following steps:
txt2ti3
ColorCheckerSG.txt ColorCheckerSG
spec2cie
ColorCheckerSG.ti3 ColorCheckerSG.cie
For the Eye-One Pro Acquisition Target 1.4 chart, the
ref/i1_RGB_Scan_1.4.cht
file should be used, and as there is no reference file
accompanying
this chart, the chart needs to be read with an instrument (usually
the
Eye-One Pro). This can be done using chartread, making use
of the
chart reference file
ref/i1_RGB_Scan_1.4.ti2:
chartread -n -a
i1_RGB_Scan_1.4
and then rename the resulting
i1_RGB_Scan_1.4.ti3
file to
i1_RGB_Scan_1.4.cie
For the HutchColor HCT chart, the
ref/Hutchcolor.cht
file
should be used, and the reference
.txt
file downloaded from the HutchColor website.
For the Christophe Métairie's Digital TargeT 003 chart with
285
patches, the
ref/CMP_DT_003.cht
file
should be used, and the cie reference
files
come
with
the
chart.
For the Christophe Métairie's Digital Target-3 chart with
570
patches, the
ref/CMP_Digital_Target-3.cht
file
should be used, and the cie reference
files
come
with
the
chart.
For the LaserSoft DCPro chart, the
ref/LaserSoftDCPro.cht
file should be used, and reference
.txt
file downloaded from the
Silverfast
website.
For the Datacolor SpyderCheckr, the
ref/SpyderChecker.cht file should be used, and a
reference
ref/SpyderChecker.cie
file made from measuring a sample chart is also available.
Alternately you could create your own reference file by
transcribing the
values
on the Datacolor website.