Re: Can DeviceLink conversions be better? was: Can this be done?
Re: Can DeviceLink conversions be better? was: Can this be done?
- Subject: Re: Can DeviceLink conversions be better? was: Can this be done?
- From: Iliah Borg <email@hidden>
- Date: Mon, 1 Sep 2008 20:02:03 -0400
Dear Klaus,
I'm not sure what all this is about. I print with device link profiles
all the time, for many years, and I'm getting much better results then
when printing with regular profiles. More so when repurposing CMYKs
between USA and Euro, which I do routinely. But even RGB to RGB device
links are worth studying rather then simple waving out. I use those
not only with printers, but with raw conversion process when the
client wants RGB files.
Dear Marco,
ColorThink Pro is capable of generating device link profiles, though
the quality might be not as good as with DeviL.
--
Best regards,
Iliah Borg
email@hidden
On Sep 1, 2008, at 6:37 PM, Klaus Karcher wrote:
Marco Ugolini wrote:
"The" gradient? There are *2* gradients overlapping one another in
that file: one is in the Cyan channel, the other in the Black
Channel. Each of them starts a few pixels away from the edge of the
image area.
And what do you see when you look at the composite image? Where does
the transition from cyan to gray start? Leftmost or somewhat away
from the left? Is it uniform?
here comes another one: <http://digitalproof.info/colorsync-users/grau-cyan-3.tif
>
do you see the slight pattern? is it uniform?
What is this supposed to prove?
It's supposed to show the gamut limitations of commonly used monitors.
As long as you have an "usual" monitor (whose gamut roughly
corresponds to sRGB), a large portion of working spaces like Adobe-
or eci-RGB, offset or injkjet gamuts is not representable
dependably. Photoshop usually uses the relative colorimetric intent
with black point compensation to transform from the image- to the
display colorspace. This means everything outside your monitor's
gamut gets clipped.
Clipping is often not distinguishable at first go: as long as the
clipping direction is not perpendicular to the color gradients in
question, it can show up as a rather smooth but consistently growing
color variation, a loss of details in colorful regions or a shift in
hue, lightness or chroma.
So when you look at Rolf's test images and see loss of details in a
certain color region, this can mean that there was clipping in the
transformation to the printer's colorspace or it can also mean the
contrary: the output space is completely utilized, but the result is
no longer representable in your monitor's gamut and the clipping
happens only on your display.
Looking at the channels separately is a good way to estimate the
limitations, but it does not supersede the overall impression of a
dependable composite display.
Print Rolf's an my test images on a reliable proofing system,
compare the proofs to your softproofs and you'll see what I mean.
Klaus
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