Kodak Perfect Touch Processing and warm up filter 81A

Discussion in 'Film and Processing' started by chris*, Oct 4, 2003.

  1. I shot two pictures back to back. One with a 81A warm up filter and one without. I
    had the Kodok Gold 100 processed by Perfect Touch. Here are the images from the
    Kodak Picture CD. I wanted to see if the filter would have any effect or be nulled out
    by the processing.
  2. Here is the the shot with the filter.
  3. And without.
  4. "Perfect Touch" is probably .87 seconds longer in the read portion of the image scan before printing. It is a machine print done in a speedy run through the lab to meet the deadline of getting it back to your store. Some images may be 'better' after "Perfect Touch" and some may not be done for better or worse.
  5. n m

    n m

    Can someone clarify this point if it is not a trade secret: is this processing some electronically digitized projection or is the negative image projected directly onto the paper?
  6. Filtration will, of course, affect the negative. So the film processing can't balance it out.
    But the Photo CD process is not "straight" for scanning color negatives, they attempt to correct the color balance, just as in color printing. Here's a quote from a paper by the Cornell University Libraries:
    Color negative film scanned on PIW systems is automatically analyzed for color and density. The analysis algorithm otherwise known as the Scene Balance Algorithm or SBA, produces color balance values which normally are applied to the scanned image. The operator can then make additional manual adjustments based on the preview image on the monitor.​
    The PIW is the Photo Imaging Workstation, which is the Photo CD scanner system. They go on to note that good Photo CD service bureaus can turn off SBA.
    In print film, you really do the color balance in the printing. Color balancing filters are mostly relevant to color slide film. If you want color control in color printing, either you do it yourself, work closely with a custom lab, or do it in a digital darkroom at home (with ICM calibration).
  7. clouds have more definition with the warming filter that the only difference i see

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