Digital BW, The Print

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.


  ----- Original Message ----- 
  From: Stephen Kobrin 
  To: DigitalBlackandWhiteThePrint@yahoogroups.com 
  Sent: Monday, December 02, 2002 1:08 PM
  Subject: [Digital BW] Re: Convert to B&W plugins


  I scan b&W film as color to take full advantage of the Nikon software 
  and it seems to me that even then, converting from rgb to grayscale 
  via the channel mixer provides some degree of control over the 
  process.  However, given that the basic data scanned is only b&w, I 
  can't quite understand why the channel mixer should make a difference 
  when converting from a monochrome rgb scan to grayscale.  I don't 
  think I am imagining it.  Would B&W Pro be worth it in this case?  I 
  think my Nik sharpening plug-in comes from the same company and I am 
  really pleased with it.

  Steve


  --- In DigitalBlackandWhiteThePrint@y..., "qdfb" <qdb@b...> wrote:
  > I agree.  I became quite adept with channel mixer, but the 
  advantage 
  > of convert to B&W pro is it's more holistic approach.  It is 
  > certainly not some beginners substitute.  It builds on the power of 
  > PS.  
  > 



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