Digital BW, The Print

Austin:
Do you seriously mean did I look at the image???
What else would I do? Am I missing something here?
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. 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. 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.
Remember Levi Hill.
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: Tuesday, December 03, 2002 4:09 PM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: RE: [Digital BW] Re: Convert to B&W plugins
 

Stan,

What you may perceive as a "tiny difference" in the histogram, can show
up
as a significant difference in the actual viewed image.  Did you try
that?

Austin

> Austin:
> That was the first thing that I did (look at the channels in the
> histo display)
> tiny, tiny differences.
>   ----- Original Message -----
>   From: Austin Franklin
>   To: DigitalBlackandWhiteThePrint@yahoogroups.com
>   Sent: Tuesday, December 03, 2002 1:51 PM
>   Subject: RE: [Digital BW] Re: Convert to B&W plugins
>
>
>   Stan,
>
>   You can just scan the B&W negative, in RGB, and bring it into
> PS and compare
>   the three channels.  You can compare RGB using the histogram, as
well as
>   compare them visually by hitting <ctl> ~, 1, 2 and 3...for All
Channels,
>   Red, Green, Blue...  Depending on the image, you will see anywhere
from
>   small tonal differences, to quite noticeable tonal differences in
the
>   different channels.
>
>   Regards,
>
>   Austin
>
>
>   > -----Original Message-----
>   > From: Shire,Stanley [mailto:sshire@...]
>   > Sent: Tuesday, December 03, 2002 1:21 PM
>   > To: DigitalBlackandWhiteThePrint@yahoogroups.com
>   > Subject: Re: [Digital BW] Re: Convert to B&W plugins
>   >
>   >
>   > BW neg scans in color neg mode
>   >
>   > Quick on-the-fly-between-classes test results
>   >
>   > 35mm tmax 100 neg
>   > Tmax developer
>   >
>   > The scans were made on an Imacon 848 and a Coolscan 1000 (I
>   > figured that the greatest differences would show with these two)
>   >
>   > Both scanners set to scan at 8 bit, color neg mode.
>   > Scan sizes were matched as closely as possible to 25mb
>   >
>   > 4 Markers placed in the same areas on each file. Tried to place
>   > them in areas of differing densities.
>   >
>   > Imacon 848 scan
>   > Marker    R    G    B
>   > 1            22    22    22
>   > 2            255    255    255
>   > 3            240    234    234
>   > 4            166    165    159
>   >
>   >
>   > Nikon Coolscan 1000
>   >
>   > Marker    R        G        B
>   > 1            5        5        4
>   > 2            255    255    255
>   > 3            206    199    186
>   > 4            174    171    166
>   >
>   > Did not correct for density differences between the scans as I
>   > wanted make no changes to the raw data as it came from the
scanners.
>   >
>   >
>   > Interpret this data as you will. My conclusion is that yes, there
>   > are slight differences with red being higher in density than
>   > green and blue being ther lowest density.
>   >
>   > The similar density differences between the two scans might
>   > indicate a slight warm color in the film base.
>   >
>   > Big conclusion (YMMV): Very minimal difference between scanning
>   > in RGB and GS modes.
>   > Very minor tonal changes when converting with the ConvertToBW Pro
>   > plugin. Not enough (if I were shooting a lot of BW film) to make
>   > me go with a file that's 3x larger.
>   >
>   > Any thoughts appreciated.





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