RE: <no subject>
RE: <no subject>
- Subject: RE: <no subject>
- From: Ray Maxwell <email@hidden>
- Date: Mon, 26 May 2003 10:56:46 -0700
>
To Whom It Concerns,
>
>
What are the LAB values for Black at the
>
25%
>
,50%,75% .
>
Also, can LAB values be read from a CMYK build at the quarter tone,
>
midtone,
>
and three quarter tone areas ? If so, what are they?
>
Thank you.
>
>
Regards,
>
Gerry Gerlach
>
Integrity Graphics
>
Unfortunately, no one can tell you, unless they know the black ink you are
using (what color it is), and the Max density you are pirnting to, and the
paper you are printing on and the dot gain of your press and about 10 other
parameters of your press settings. CMYK percentages do not specify colors.
CIELab does. This is why CIELab is the interchange space for ICC color
management.
For the printing conditions for the SWOP press run described in TR001 the
readings are:
Tone L* a* b*
25% = 71.28 -0.86 1.45
50% = 54.82 -0.84 0.51
70% = 42.52 -0.52 0.22
80% = 35.01 -0.51 0.14
100%= 18.62 0.43 1.03
75% K was not measured in the data.
Hope this helps,
Ray
Creo
Ray Maxwell | Senior Color Systems Engineer, Inkjet Printing
4225 Kincaid Street | Phone (604) 451-2700 ext. 2004
Burnaby, B.C.
Canada V5G 4P5
IMAGINE CREATE BELIEVE
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