R-RA4 Reduce Contrast / Portraits

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

  1. RellikJM

    RellikJM Member

    Messages:
    33
    Joined:
    Feb 12, 2008
    Location:
    Colorado
    Shooter:
    35mm
    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

    Messages:
    28,065
    Joined:
    Apr 19, 2005
    Location:
    Rochester, NY
    Shooter:
    Multi Format
    I'm not sure what your question is about. Sorry. Can you clarify?

    PE
     
  3. OP
    OP
    RellikJM

    RellikJM Member

    Messages:
    33
    Joined:
    Feb 12, 2008
    Location:
    Colorado
    Shooter:
    35mm
    Sorry,

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

    Photo Engineer Subscriber

    Messages:
    28,065
    Joined:
    Apr 19, 2005
    Location:
    Rochester, NY
    Shooter:
    Multi Format
    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
     
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies. If you have a Photrio account, please log in (and select 'stay logged in') to prevent recurrence of this notice.
,