Digital BW, The Print

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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