Re: RGB neutral greys/grey balance
Re: RGB neutral greys/grey balance
- Subject: Re: RGB neutral greys/grey balance
- From: Henrik Holmegaard <email@hidden>
- Date: Wed, 26 Sep 2001 11:50:58 +0200
David wrote :
If you have a device with
excellent liniarization, then a custom profile could be used indefinately,
Now I know there are folks with big broomsticks who have a mind to
swat with them, so I'll try dodging ...
a. if you place the ColorLab / MeasureTool window at the four corners
of a CRT, save the 42 patch measurements to disk, and play with the
Comparing function, you will find an average dE 2.5+ with outliers at
dE5+ for the diagonals which is big enough that you can see this
clearly in the MeasureTool color Reference and Sample comparison
window at bottom (this is where the monitor makers start hunting for
broomsticks ... -:)),
b. if you place the same test chart across the format, down the
format and through the print run on an offset press, you will get
averages and outliers which I think are best censured for the greater
good of the cause -:),
c. if you print the same test chart multiple times across the format
of HP5KPS and play the same trick, you get an average dE 0.5 with
outliers at dE 1.5.
I liked the old Kodak 8500PS because you could use the Kodak DCP 9000
calibration software (it was basically the same printer hardware
inside both models) with a spot spectro or autoscanning densitometer.
And oddly, about two weeks after I posted the tip on the List, the
calibration software that had instrument support vanished off the
Kodak web site -:).
I also liked the Apple monitor calibration framework because it did a
decent job in the days before users started buying nifty instruments
that do this and that and the other. But because linearity is built
into the hardware, Apple and HP would have a slightly harder time
unwiring things on site for the same decalibrating effect -:).
The whole discussion about color managed workflows starts the same
place today as several years ago: A stable studio printer without
which you can't share color with others off-site and in varied
lighting conditions, an editing space that doesn't clip the capture
gamut (eciRGB10 or Lab) and a 3D gamut comparison tool to figure out
where you are at.
I suppose the rub with the List is that it often strolls off into the
fringes of the field and forgets to just repeat the basics at
intervals. Like tell them, thell them again, and tell them once more
-:).