Re: Optical brightener
Re: Optical brightener
- Subject: Re: Optical brightener
- From: Henrik Holmegaard <email@hidden>
- Date: Tue, 4 Sep 2001 18:48:27 +0200
David Remington <email@hidden> wrote:
Our work consists of digital reproductions of Library materials.
Those materials
can be almost anything you could name manuscripts, photographs, maps, books,
etchings, illustrations....Saturated colors reproduce pretty well,
but much of our subject material is muted palette warm toned documents
(parchment and velum) and vintage photographic prints.
OK, that puts us more in the picture :
a. you can't have in print what you don't have in RGB, so what color
model (Lab or RGB) and color space (e.g. eciRGB10, AdobeRGB(1998))
are you using as source or input ?
b. are you photographing the materials before digitalizing them, or
digitalizing them directly using say a flatbed scanner, and if so
with what size gamut in the scanner profile ?
c. a UV cut filter on the spectrophotometer gives you a neutral paper
white, and because the perceptual and relative colorimetric intents
are media relative it also gives you a neutral gray axis in the
separation (which seems to be part of your problem, yes?), but you
can just as well use the ProfileEditor module of ProfileMaker to
neutralize the blue cast, it's really very simple whether numerically
or visually.
d. the UV filter / white point edit does not increase or decrease the
size of your printer's color space, nor the size of the RGB color
space you are using as input.
In general using a printer that is limited to accepting data through
the RGB-only printing pipeline of QuickDraw and GDI is a rather bad
idea. With his share of critical contention this week, I'd think
David Tobie for once won't object to me saying these printers are
more trouble than they're worth, which was the first argument we had,
and we're still at it -:).
Hope this helps