Re: ISO 12647-7 "tolerances"
Re: ISO 12647-7 "tolerances"
- Subject: Re: ISO 12647-7 "tolerances"
- From: Kevin Muldoon <email@hidden>
- Date: Thu, 24 Apr 2008 16:01:31 -0400
Thanks for forwarding the PDFs Mark. Fascinating stuff. I see your
point on high chroma colors vs. low chroma, though I never suspected
the 'high-chroma = more room for L*a*b deviation' nature of high
chroma colors.
Color guys understand the human eye is very sensitive to neutrals. I
think we have all compared and measured greyscale steps from
different printers that register well below a deltaE 2 tolerance
between then, but (at least to my eye) are obviously not the same
grayscale at all. I see the same phenomena with paper white of
different medias as well as very light colors. In other words, L*a*b
DeltaE says I can't see a difference, but I do. I understand there is
a calculation to modify the DeltaE for lighter colors, but haven't
heard of addressing sensitivity to neutrals and off neutrals.
I'm going to have some fun tinkering with this! Think I'll start with
some grayscale wedges.
--
Kevin Muldoon, Owner
TrueBlueDot - Fine Art Printing
New Haven, CT 06511
email@hidden
www.truebluedot.com
"Our pigment meets your imagination"
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