Re: Lc and Lm
Re: Lc and Lm
- Subject: Re: Lc and Lm
- From: Steve Upton <email@hidden>
- Date: Thu, 4 Jan 2001 09:00:07 -0800
I wanted to add a small note about the "purity" of light c and m hues.
I have found some interesting observations profiling printers in
which the light c and m hues do not match the dark hues very closely.
If you plot the gamuts of the printer profiles in 3D using
ColorThink, the lines radiating out and down from the white point
"apex" depict the color behavior of the inks. In most cases the
yellow ridge for pure yellow 0-100% fires straight out from the white
point. In CcMmYK printers however the Cc and Mm lines curve,
sometimes drastically, as they move from 0-100%.
I suspect some of this curvature is due to Lab considerations but it
is interesting to note the amount of color (hue) shift that occurs
when simply adding "one" ink. Traditional graphic arts pigments like
those in the SWOP TR001 profile do not exhibit any of this curvature
and seem to be almost "mathematically" perfect.
Without ColorSync and ICC profiles to decode these twisted color
spaces, we'd be sunk.
Regards,
Steve Upton
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