For what it's worth, Ian, I found your explanation clear,
and saved it in my Photoshop Tips folder. Thanks... and I'm very glad
that you posted it on list.
Hersch
At 02:47 PM 10/15/2001, you wrote:
Can I use these with other scanner
calibration
> software? If so, which?
It should be possible to use them with most scanner profiling
packages.
Probably the cheapest and probably best at present is ICC-Scan from
Profile
City
http://www.profilecity.com
> Another question: I've tried to correlate the figures in these
tables
> with PS onscreen densitometer readings but can't get anything
> meaningful.
It will be difficult since the first three are CIE XYZ definitions for
each
patch. The Lab L, A and B are the ones most likely to make sense, but
even
then Photoshop will only handle integer numbers in Lab mode and the Lab C
is
chroma - you call it saturation. It is the measure of distance of the
colour
from neutral point. Lab H is Hue - this is the measured angle of the
colour
from the +a axis on the Lab diagram and is measured in degrees. If you
think
of a colour wheel with dead centre being neutral and all the fully
saturated
colours around the circumference of the wheel you'll get the idea
regarding
LabCH
