-Q: Normally the target device values are floating point numbers that may get
rounded and quantized in the process of printing them or reproducing them on
the printing or display device. If some of this quantization can be accounted
for, it may improve the accuracy of the resulting profile, and the Q parameter
allows this quantization to be specified. The parameter is the number of binary
digits (bits) that the device values should be quantized to. In many systems
the right value would be 8 bits. Note that if 8 bit TIFF output is selected
(-t) without dithering (no -D) that the values will by default be quantized to
8 bits, and that if 16 bit TIFF output is selected (-T) or 8 bit TIFF with
dithering (-D) that the values will by default be quantized to 16 bits.
Q1:What will happen if i set -t together with -D and -T without -D??
The -K file.cal parameter specifies a printer calibration file created by
printcal, and the supplied calibration curves will be applied to the test patch
values. This allows profiling of a printing system that doesn't natively
support calibration. The calibration curves will also be included in the
resulting .ti2 file, so that they can be passed through to .ti3 file and ICC
profile, to allow accurate computation of ink limits.
The -I file.cal parameter specifies a printer calibration file created by
printcal, and the calibration curves will be included in the included in the
resulting .ti2 file, so that they can be passed through to .ti3 file and ICC
profile, to allow accurate computation of ink limits. The calibration is not
applied to the test patch values, but is assumed to be applied somewhere else
in the printing workflow when printing the profile test chart.
Q2:what's the difference between -K and -I?
The -x parameter allows specifying the labelling sequence used for strips (e.g.
the X axis of the chart). By default this will be a character sequence A, B, C
.. Z. AA, AB, AC .. ZZ, but this can be changed by specifying an alternate
labelling sequence pattern. The pattern specifies the labelling sequence as
follows: First comes the definition of the symbols for each digit location,
least significant to most significant, each digit separated by the ','
character. Note that space is a valid character. The number of definitions
declares the maximum number of digits. For example, for a 2 digit numerical
sequence: "0123456789, 123456789" would define 0..99 with the most significant
digit suppressed when it is 0 (because it uses a space rather than 0). Ranges
can be used for brevity: "0-9, 1-9". As a special case, the '@' character can
be used to instead of '0' to indicate suppression of the leading zero:
"0-9,@-9". Leading ' ' characters in the resulting generated sequence are
omitted. Optionally following this and delimited by a ';' character, are the
definitions of valid segments of the index sequence. For instance, to define
the index range to be 1..19, 30..39 one could use the pattern "0-9,
1-9;1-19,30-39". Of course most of the time an alphabetic sequence will be
wanted, to distinguish it from the numerical sequence used to number the
patches in a strip. For a sequence A, B, C .. AA, AB, AC etc. (the default used
in Argyll), the following patter would be used: "A-Z, A-Z". For a some ECI2002R
charts that skip columns Y and Z, and use a leading numeric digits for
addressing strips over 26, the following might be used: "A-Z, 2-9;A-X,2A-9Z".
For example, for a 2 digit numerical sequence: "0123456789, 123456789" would
define 0..99 with the most significant digit suppressed when it is 0 (because
it uses a space rather than 0).
Q3:why typing "0123456789, 123456789" will get 0..99????
Leading ' ' characters in the resulting generated sequence are omitted
Q4:what will the result show up when using the character ' '
For a sequence A, B, C .. AA, AB, AC etc. (the default used in Argyll), the
following patter would be used: "A-Z, A-Z".
Q5:how it combile the A and Z to A, B, C .. AA, AB, AC ??
The -y parameter allows specifying the labelling sequence used for patches
(e.g. the Y axis of the chart). By default this will be a number sequence 1, 2,
..10, 11, ... 999, but this can be changed by specifying an alternate labelling
sequence pattern. See the above description for the labelling sequence encoding.
Q6:can i encoding the 1, 2, ..10, 11, ... 999 to A, B, C .. AA, AB, AC etc????
The -w parameter changes how a white colorspace test chart (ie. Additive Grey
monochrome) will be represented in the Postscript or TIFF output. The default
is to use the DeviceGray representation (-wg), but Device RGB can also be used,
where the R, G &B values are all set to the same value (-wr), a White
separation color can be specified (-ws), or a DeviceN White color can be used
(-wn).
Q7:not quite get what the result is (-ws -wn and -wg or -wr)
The -k parameter changes how a black colorspace test chart (ie. Subtractive
Grey monochrome ) will be represented in the Postscript or TIFF output. The
default is to use the DeviceGray representation (-kg), but Device CMYK can also
be used, where the CMY values are zero, and just the K channel is used (-kc), a
Black separation color can be specified (-ks), or a DeviceN Black color can be
used (-kn).
Q8:not quite get what the result is (-ks -kn and -kg or -kr)
The -o parameter changes how a CMY colorspace test chart will be represented in
the Postscript or TIFF output. The default is to use the DeviceCMYK
representation (-ok) where the K value is always zero, or inverted Device RGB
(-or), or as a 3 channel DeviceN colorsoace can be used (-on).
Q9:what is inverted Device RGB and what is the 3 channel DeviceN colorsoace
The -m parameter sets the page margin for all sides. If the printer has print
margins larger than the default assumed by printtarg, then critical parts of
the test chart may be cropped or scaled, and not printed properly. Increasing
the margin from the default of 6 mm to 10 or 15 mm, may alleviate this problem.
(Note that the number of patches per page may be reduced as a consequence.)
Decreasing the margin below 6 mm may be possible for printers that have smaller
or no margins, increasing the number of patches possible on each page. A TIFF
chart raster will be the size of the paper minus the margin, so that it can be
placed on a page that size without cropping or inadvertent scaling.
Q10: could u please explain it in a simple way?
The -M parameter sets the page margin for all sides the same as -m, but for a
TIFF chart the margin will be included in the raster, meaning that the TIFF
will have to be printed right to the edge of the paper, or on paper larger
than the raster size. (Having the raster be the full page size may be useful in
certain situations.)
Q11: could u please explain it in a simple way?
The -P flag disables any normal limiting of strip length that would normally be
imposed due to guide or instrument limitations. There is still an upper limit
of around 500 patches or 2Meters though. Note that if you generate a strip
larger than the instrument can cope with, it may be unable to read the strip.
Q12:what's the meaning of it?
The -L flag suppresses the left margin that is added for instruments that have
a paper holder that has a clip to hold the chart in place, while it is being
read. (Currently this is only the Eye-One Pro).
The -U flag suppresses the CUPS %cupsJobTicket: cups-disable-cmm in PS and EPS
files. By default this ensures that the resulting files doesn't have color
management applied to it. If you are creating a test chart that should be color
managed (perhaps because you want to use it to verify the overall operation of
the printing system), then you can use the -U flag to disable this.
Q13:Do this sentence means that if i set -U flag i will get a
color-managed-chart as the result?
basename is the base file name of the .ti1 file that contains the device values
to be put on the test chart. printtarg will output a basename.ps or one or more
basename_NN.eps or basename_NN.tif files files that should be printed on the
devices, as well as a basename.ti2 file that contains both the device test
point values, and the location of the corresponding patch on the test chart. If
the -s or -Sflag was specified, then one or more basename_NN.cht files will
also be generated.
Q14:where to put the the parameters in a command ? at last???
