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: Klaus Karcher <email@hidden>
- Date: Tue, 02 Sep 2008 00:37:11 +0200
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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