Re: Good demonstration of metamerism?
Re: Good demonstration of metamerism?
- Subject: Re: Good demonstration of metamerism?
- From: "dpascale" <email@hidden>
- Date: Fri, 18 Jun 2010 15:31:08 -0400
Hello Ben,
"What I'm thinking of doing now is creating a small daylight-balanced print
on the iPF8100, which should theoretically be minimally prone to color
shifts under different illuminants."
You may be in for a surprise here ( I do not have an iPF printer, so this is
why I write "may").
This is not my experience with ink-jet printers, even if some of them are
much better than others.
Still, you may find that metamerism is low while Color Inconstancy is high;
this happens when two colors have color shifts in the same direction for
different illuminants.
Have a look at the Metamerism Index tool of BabelColor CT&A (Warning: it is
a plug for a product I sell):
http://www.babelcolor.com/main_level/screen_shots/Spectral_Tools_MI.htm
This screenshot uses the example in Bern's book "Principles of Color
Technology" (a gray from black ink vs a CMY grey)
It computes everything that was discussed in this thread, with proper
terminology ;-)
Danny
www.babelcolor.com
----- Original Message -----
From: "Ben Goren" <email@hidden>
To: "colorsync user list" <email@hidden>
Sent: Friday, June 18, 2010 3:05 PM
Subject: Re: Good demonstration of metamerism?
On 2010 Jun 12, at 2:29 PM, Ben Goren wrote:
I'd like to have a good demonstration of metamerism[. . . .]
Thanks all for the enlightening discussion.
What I'm thinking of doing now is creating a small daylight-balanced print
on the iPF8100, which should theoretically be minimally prone to color
shifts under different illuminants. I'll then create color laser printer
matches for a few different illuminants -- using Argyll's ability to
create a printer profile with a custom illuminant, perhaps also with
different amounts of GCR -- and arrange them all on the same sheet.
I'll probably include a gray ramp, as well. The iPF8100 has four gray /
black inks, and theoretically uses them exclusively when R=G=B=0.
Does that seem reasonably representative? And, at the same time, are the
effects likely to be dramatic enough to illustrate the point?
Robin, thanks for the pointer to the Munsell learning kit. I'll plan on
getting it.
Chris, thanks for the pointer to Alexandrite. I've never heard of it
before. I'll have to see if any local jewelry stores have any I could look
at, and see if any of the synthetic varieties might be something I could
possibly save up for.
Cheers,
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