R-RA4 Reduce Contrast / Portraits

Discussion in 'Color: Film, Paper, and Chemistry' started by RellikJM, Feb 6, 2009.

  1. RellikJM

    RellikJM Member

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    I want to try the R-RA4 talked about here on APUG.

    Two questions:

    1. Why doesn't the process work well for portraits?
    2. Is it possible to use Selectol or Selectol Soft to reduce the contrast ?
     
  2. Photo Engineer

    Photo Engineer Subscriber

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    I'm not sure what your question is about. Sorry. Can you clarify?

    PE
     
  3. OP
    OP
    RellikJM

    RellikJM Member

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    Sorry,

    R-RA4 - Reversal RA4 for printing from slides.
     
  4. Photo Engineer

    Photo Engineer Subscriber

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    Ok then, color neg-pos paper has a contrast of 2.5 and the film has a contrast of 0.6 to give a final print contrast of about 1.5. Color pos-pos papers had a contrast of 1.0 and color reversal films have a contrast of about 1.8 for a final print contrast of about 1.8.

    If you print color positives onto a neg-pos paper the print contrast ranges as high as 1.8 x 2.5 or 4.5 and with finesse as low as about 2 which is good for some scenes, but not others.

    A soft B&W developer may or may not work. It usually cannot due to the fact that reversal papers achieved their low contrast by using 9 emulsions to spread out the curve, but neg-pos papers have only 3 primary emulsions and cannot be easily spread.

    PE