Re: Using a MacBeth Color Checker test chart
Re: Using a MacBeth Color Checker test chart
- Subject: Re: Using a MacBeth Color Checker test chart
- From: Henrik Holmegaard <email@hidden>
- Date: Mon, 17 Dec 2001 08:45:05 +0100
"Schiller, Susan" <email@hidden> wrote:
We have a Heidelburg Topaz scanner with LinoColor 5.1 software and wish to
be advised by this group on what is the best procedure to follow when using
a MacBeth Color Chart that is in the photo to be scanned. Also, if this is
not the best chart to use, what are your recommendations? Thank you for your
advise.
First of all, upgrade to LinoColor 6.0 to be able to edit the scanner
profile on the fly, save it into the ColorSync Profiles folder, and
immediately reload it without quitting the application, and to be
able to read and write ICC profiles in all file formats including EPS
DCS. If you hang in there just a little longer, I would think there's
a good chance NewColor 7000 for the Mac will support your hardware,
too. It is by far the slickest show in town for high-bit color
capture.
Next, once you start editing the scanner profile directly in
LinoColor 6.0, just move the colors to where you want using the LCh
editing tools, save out the scanner profile, reload it and start
yourself a new prescan. And before you ask: Nope, LinoColor does not
edit all intents in all profiles, only the intents designed to
produce color (in scanner and printer profiles), not the intents
designed to proof color (in printer profiles).
The typical reason users wish to edit a scanner profile is to
automate color corrections, for instance, for a particular film cast
as there are not as many IT8 targets as there are film types. I seem
to remember writing a how-to post a long time ago. At any rate keep
in mind that if you edit the scanner profile, you should reduce
complexity by doing so in LinoColor 6 Lab preview. This term is not
what it seems as the scanner does not scan Lab (no device renders Lab
data values, only RGB or CMYK data values), the term Lab preview just
signifies that in your profile chain you only have the scanner
profile and the monitor profile, so the perceptual gamut mapping in a
printer profile plays no part in what you see.
Hope this helps.