Digital BW, The Print

Excuse the tone of my last post. Way too many students doing PS
restoration projects, me trying to give each a reasonable workflow and
hanging a faculty show into the wee hours.
 
Your points are interesting. Steven Kobrin is going to email me his file
when he returns from a trip so that I can see what you guys are
experiencing.
I will get the gs scan of the test neg done in a day or two.
S.
 
Stan Shire
Associate Professor/Department Chair
Photographic Imaging
Community College of Philadelphia
Adobe Photoshop 6 A.C.E.
Author: Hands On Photoshop 7: Tutorial Workshops

215 751-8320
sshire@...
-----Original Message-----
From: Austin Franklin [mailto:darkroom@...] 
Sent: Wednesday, December 04, 2002 9:22 AM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: RE: [Digital BW] Re: Convert to B&W plugins
 
Hi Stan,

> Austin:
> Do you seriously mean did I look at the image???
> What else would I do? Am I missing something here?

It wasn't meant that if you didn't, you were a dunderfutzen!  It wasn't
my
first thought do simply thumb through the channels...

> I am fairly competent in Photoshop, have been printing traditional
color
> and black and white for about 40 years and have studied with Ansel
> Adams. My monitor is carefully (and regularly) calibrated with an
> EyeOne, I build profiles with real software and take my vitamins and
> Wheaties each day.

OK, you get a gold star!

> Despite this, I still see only very minor differences
> in the channels of a grayscale image scanned as a color neg and I
> attribute these to a base color.

I'm not sure what you mean by "base color", as in the actual color of
the
film?  The majority of differences I saw in the one B&W negative I
scanned
as RGB were in the mid-tones.  How would the base color manifest it self
prominently different in the mid-tones?

> A grayscale is just
> that..gray.neutral.no color, and if someone can show me how scanning a
> BW neg as an RGB image would allow any (other that very minor) changes
> in the image, I'd love to learn this.

Perhaps you could explain why "convert to grayscale" in Photoshop uses a
"mix" of the three channels, instead of just using one...

The scanner (at least all but the Leaf, that I am aware of) scans
everything
as RGB anyway...whether you have selected B&W or color, and then
converts
the RGB data to grayscale using some canned "mix" of the three color
channels.  Perhaps there is a scanner that simply takes one of the color
channels and calls that grayscale...and sends you only that channel when
you
ask for grayscale data.

What people are saying, is they get better results by getting the RGB
data
from the scanner and applying their own "mix" of the three channels in
PS
when they convert to grayscale.  This makes sense, as different films
will
have different "colors", and simply using a single mix in the scanner
will
give inconsistent results across films.  I also believe you certainly
can do
at least as equal a job in PS using your own mix, if the mix the scanner
has
chosen happens to be perfect, but somehow I doubt it, so it leads one to
believe you certainly could do better.  It's also subjective.  What's
important in the image to one person (such as using a lot of the red
channel
may make the image fuzzier) may be different to another.

Regards,

Austin


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