RE: blues turing purple and reds turning orange
RE: blues turing purple and reds turning orange
- Subject: RE: blues turing purple and reds turning orange
- From: "Roger Breton" <email@hidden>
- Date: Sat, 27 Jul 2002 11:35:53 -0400
Steven Kornreich wrote:
>
What can I do with the common problem of blues turing purple and reds
>
turning orange.
And then Bruce J. Lindbloom replied:
>
I think profile editing is needed to fix this.
>
If anyone is interested in understand *why* this happens, an illustrated
>
explanation may be found here:
>
<http://www.brucelindbloom.com/index.html?MunsellCalcHelp.html#BluePurple>
>
(It is explained as as part of the "Munsell Display Calculator.")
>
--
>
Bruce J. Lindbloom
I think the problem is not one of gamut mapping which, if that's what it is,
is well illustrated graphically on your site, Bruce. The way I understood
Steve's original post is that he's confronted with an "ink drying" problem,
in that the blues he gets fresh from his printer turn purple with time, as
the ink dry, same for the reds which he says turn orange. I believe this
stems from a chemical reaction between the inks and the air.
I have a strong feeling that's what Steve meant (but I could be wrong). Why
I feel that way is because I also observe the same phenomenon with dye-based
inks when printed on certain media (EPSON 10000, HP 5000, and others too).
The cure may rest along the line of what Neil Snape suggested, what you also
suggested above, and Steve found out in the meanwhile -- profile editing.
Nevertheless, the hue shift problem is real and ought to be systematically
evaluated as part of profiling and inkjet printer. I agree certain will play
that problem down as it is less severe with certain inks/media combination
than others but it is still a fact of profiling and injket printer.
Case in point, HP's new 20ps. I personnaly have not had the chance to test
this baby with BEST media (with a BEST Rip neither) as it is too prohibitive
to get in my area ($500 cdn for a roll of Remoteproof 9180 - 24" x 100').
But with the exception of the three 'approved' HP media made specifically
for this model, all the other inkjet media I have tested with this dye-based
printer exhibit a substantial hue shift as the ink dry on paper. ILFORD
Gallerie Classic, for instance, does shift up to 11 Delta over a period of 3
days!
That's bad. And this is not even bringing in fluorescence problem or
metamerism issue in the equation.
For mere mortals like me and others on the list who are lurking, could
anyone of you Neil, Bruce or Steve explain in simple words the way you edit
an ouput profile to correct for this hue shift problem?
If it's not too much to ask.
Roger Breton
Laval Qc
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