[argyllcms] Re: Calibration and profiling of wide format solvent printer
- From: Nikolay Pokhilchenko <nikolay_po@xxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 06 Feb 2014 12:58:27 +0400
6 Feb. 2014, 0:16 +01:00 mbielowicz wrote:
>Let there be a workflow (without native calibration capabilities):
An advice: do not use 8 bit per channel bitmaps nor for profiling nor for
production printing if the calibration curves are steep because of quantizing.
8 bit is OK for calibrated device and for traditional RGB abstract color
spaces. But as soon as you apply the calibration on image the last become
"uncalibrated" and in case of high degree of curvature you may got banding on
gradients and loss of details.
It's ok using PostScript at profiling stage because it's precise (the channel
values passed from argyllcms in floating point format). But for real image
printing you may need convert the sources into 16 bit before converting by
cctiff. If your RIP don't supporting 16 bit or have a speed constraints with 16
bit per channel CMYK images you may convert 16-bit "uncalibrated" image into 8
bit with apllying some kind of dither.
For example an ImageMagic command line:
convert -verbose -ordered-dither o4x4,256 -depth 8 -compress LZW
Input_from_Argyll.tif Output_to_RIP.tif
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