Comment on PS workflow

freeman said:

... if you don't mind a few more questions. Are you saying that
you always use the Luminosity mode with Unsharp Mask, and if so,
what's the difference between that and normal?

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Chuck Gardner said:

http://www.cliffshade.com/dpfwiw/vision.htm

This is also a useful source of practical information,

http://www.ledet.com/margulis/LABCorrection.pdf

In professional graphic arts the end product of RGB photo editing
is usually a set of CYMK separations (a CYMK mode file) prepared
for offset printing. As noted in the Photoshop manual and on-line
help, CIELab is the intermediate colorspace used for mode changes.
Thus a RGB > CYMK mode change is actually a RGB > Lab> CYMK mode
change. When you view a CYMK file in Photoshop, it must do a CYMK >
RGB conversion to disply the file on the RGB monitor, but what is
actually happening is a CYMK > Lab > RGB conversion. I don't fully
understand the underpinnings of Photoshop, but have assumed that
the computational engine for color space operated in tems of Lab
coordinates.

In practical terms, I've never seen a problem with color switching
back and forth from RGB to Lab with digital camera files. But I
usually apply USM in RGB using high amounts / small radius (A=500
R=0.2)and Fade USM (luminance) because the results are quite
similar (and I'm lazy).

Chuck Gardner

cadmandew said:

Andrew Burke said:

I was just reading an article from Greg Duncan about sharpening in
RPS Journal (from the good old library) and he says that when you
convert from RGB to LAB and then back again you lose 14,590,459 of
your 16 million colors!

I don't know if that's an issue or not. His recommendation is to
make a duplicate layer, sharpen that and set its blend mode to
Darken. Then make a copy of that layer, set its mode to lighten and
reduce its opacity to around 18% (in his example)...

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Andrew

I really dont know where Fievel and the rest get their info about
sharpening in the lab channel but they are mis-informed and inturn
they mis-inform others. All books I have ever read state the same
thang Duncan says. Like I said if you dont want any color shifts
just fade to luminosity after sharpening.

cadmandew

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cadmandew said:

Andrew

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cadmandew said:

thang Duncan says. Like I said if you dont want any color shifts
just fade to luminosity after sharpening.

cadmandew

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feivel said:

i estimate about 4 hours per photo

but i think danny posted it for it's comprehensiveness, take parts
out of it and add to current workflow, or start here and simplify
and discard.

feivel

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