Digital BW, The Print

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.