Digital BW, The Print

Op 10-1-2011 16:26, Roger Barrett schreef:

> I've come back to this because I just had a query from a customer of mine about magenta shadows in B&W prints from his R1400. I got him to print a 51-step (QTR) target which I then measured with my i1. It looks reasonably neutral, if anything slightly green, and pretty linear too so the profile is doing a reasonable job. Under my 4700K Solux lamps it looks really nice; however, in normal T-H lighting the whole thing is unacceptably red - much worse than my old Lyson QuadBlack prints.
>
> When I measured the 0,0,0 patch I found an L* of 4,2 but a reflectance rising fairly linearly from 0,0033 at 630nm to 0,317 at 730nm  And yes - he assures me that it is genuine Epson ink.
>
> Am I mis-interpreting something here or does the Epson ink suffer from (severe) metamerism?

Like David wrote the greyscale you see is made of CMY dye mixes and will 
show color inconstancy in changing lighting. Something quite different 
from the Lyson Quad inks that should have started from a grey base for 
all the inks.

Or do we interpret your message incorrect and is the image made with the 
Claria black ink only (if the printer driver has that Black Only mode)?
If so then check whether the paper is having FBAs.
Paul is researching the Claria Black ink and I guess he would have 
observed "metamerism" mild or severe fast enough.

-- 
Met vriendelijke groeten,   Ernst

Try: http://tech.groups.yahoo.com/group/Wide_Inkjet_Printers/

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