how to calibrate b&w printing
how to calibrate b&w printing
- Subject: how to calibrate b&w printing
- From: "Richard Wolfson" <email@hidden>
- Date: Mon, 13 May 2002 17:19:41 -0400
- Thread-topic: how to calibrate b&w printing
I have a question for the color experts on how best to calibrate my
black and white printmaking workflow with custom quad-black inks and a
CMYK RIP.
I edit images in Photoshop grayscale mode on a calibrated monitor, mode
shift (via mulitchannel & replicating the black channel) to CMYK, then
apply hand-made partitioning curves to separate the image for my
quad-black inks. I can preview separated images with a CMYK profile I
build with Profiler PRO for my ink set .
I'd like to calibrate my workflow so I can make tonal adjustments made
in Photoshop grayscale mode, then have the image print correctly without
needing any further gamma move after partitioning. It seems to me this
should be possible if:
(a) I use the right grayscale setup (gamma or dot-gain) when editing,
and
(b) my partitioning curves produce the right mapping function from
grayscale mode pixel values (0..255) to printed densities or L* values,
which I can measure with my DTP-41. Grayscale 0 will of course map to
dMax, and grayscale 255 will map to paper white.
My question is, what printed denisity (or L* value) should grayscale 127
map to, and what overall shape should the mapping curve have (i.e., what
equation should describes). Also, what grayscale gamma or dot-gain
setting in Photoshop will match such a mapping curve. I'd appreciate any
advice or pointers to reference sources that might help.
thanks,
Richard Wolfson
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