Re: Profile causes posterisation
Re: Profile causes posterisation
- Subject: Re: Profile causes posterisation
- From: Marco Ugolini <email@hidden>
- Date: Wed, 01 Jun 2005 12:39:19 -0700
In a message dated Wed, 1 Jun 2005 11:58:48, Derek Wells wrote:
> I've found that some combinations of paper and the Epson inks can take a
> good 48 hours to reach their final colours.
In my own opinion, prints made with dyes do indeed keep drifting for a good
long time before their color stabilizes. It may take hours before things
finally stay put (a bad scenario for in-house color proofing, by the way,
since it holds back production schedules).
I am certain that taking readings right away from a test chart printed with
dyes, without waiting a substantial amount of time for color to stabilize,
will create junk profiles, possibly with posterization as well.
But prints from pigments (UltraChrome, at least) don't seem to drift much,
if at all observably, after the first half hour or so. I must admit that I
have not sat down and calculated the color drift of UltraChrome pigment
prints with my EyeOne Pro, so my observations are purely empirical, i.e.,
unscientific. But, just from simple observation, the dramatic shifts plainly
noticeable with most dyes are a whole other order of magnitude compared to
pigments. (I would submit the Epson 1280 as being a particularly striking
example of this "color wackiness" -- a highly technical term fer ya...)
Do others agree? What is a good compromise between "safe" and a "reasonable"
wait time for pigment prints, in your experience? Is a half hour too short?
--------------
Marco Ugolini
Mill Valley, CA\
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