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Message

Paper white square measurement

2008-11-16 by John Arnold

Hi,

I have made my first real profile using the 225 patch target and am really pleased with the 
results! The green cast I was getting with the canned profiles is gone. Fleshtones are just 
a tad on the warm side compared to the test print soft proof, but it's very close and 
certainly acceptable. 

Nevertheless, I am trying to understand what might be causing the extra warmth and 
wondered if it could have anything to do with the paper white square reading just slightly 
cyan. 

When I measure the square, L=95.10, a=(-1.16) and the  b=(-1.78). Could that slight bit 
of cyan be pushing things in a warm direction? Also, I noticed when calibrating my 
spectro and measuring the white tile using the measure tool that my "b" reading is more 
negative than the "a" reading. "A" is about (-0.74) and "b" is (-1.84). I also noticed that 
other users get similar results with b being more negative than a. Is that because the white 
tile is also slightly more negative in the b than the a? 

Don't mean to pester you guys with too many questions, but I really do want to understand 
grasp the process so as to optimize the profiles. Thanks again for your help.

John

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