CIELab solid ink values confusion
CIELab solid ink values confusion
- Subject: CIELab solid ink values confusion
- From: Scott Campbell <email@hidden>
- Date: Sun, 8 Feb 2009 15:32:20 -0600
On page 53 in the G7 "how to" guide the ISO 12647-2 Solid Ink values
chart is nicely presented. I'm mostly concerned with No5 papers
because thats what I run most.
The CIELab values for a 100% K are 31,1,3(white backing).
I open the Idealliance ISO 12647-7 2007 Color Control Strip in
Photoshop with the color settings rendering intent set to Absolute. I
assign the SWOP2006_Coated5v2.icc profile. I set my info pallete to
Lab, 16 bit/ch, and do the math described in the read me file
supplied with the control strip. The Lab values for the 100% K end up
being: 18,1,1. Quite a different L* value than the ISO.
Out on press during a calibration run, should I target the ISO
12647-2 CIELab solids for No5, or should I target the ICC profile's
Lab values? My proofs will be ink jet and simulate the
SWOP2006_Coated5v2 profile.
Opening the SWOP2006 profile in ColorThink, the solid Lab values
agree with Photoshop.
Watching the "G7 Update" recorded webinar from Idealliance's Website,
I noticed some of the SWOP No3 Solid CIELab values in the video don't
match the values in the ISO 12647-2 chart in the most recent G7 "how
to."
Sorry if this topic has all ready been discussed. Any guidance would
be greatly appreciated,
Thank you,
Scott Campbell
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