Digital BW, The Print

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.