3 Replies Latest reply on Nov 1, 2012 4:31 AM by H.Glaps

    Problem with cineon converter in CS5.5?

    cineon_dude Level 1

      I was wondering if anyone has encountered this problem when going from log to lin and back to log in CS 5.5.

       

      As a test, I import a 10-bit log cin or dpx file into CS 5.5 and apply 2 instances of the Cineon Converter effect with the following settings:

       

      1st Instance:

      Conversion Type: Log to Linear

      10 Bit Black Point: 95

      Internal Black Point: 0

      10 Bit White Point: 685

      Internal White Point: 1

      Gamma: 1.70

      Highlight Rolloff: 0

       

      2nd Instance:

      Conversion Type: Linear to Log

      10 Bit Black Point: 95

      Internal Black Point: 0

      10 Bit White Point: 685

      Internal White Point: 1

      Gamma: 1.70

      Highlight Rolloff: 0

       

      Project = 32bpc

      Working Space = None

      Blend Colors Using 1.0 Gamma = Off

      File Interpretation = Full Range

       

      These settings should take my image from log to lin and back with no loss of information. Unfortunately, the under-black information in the image does not survive the conversion process. I've tried several different log images and get the same results. Using the classic cineon "Marcie" calibration image as my test image illustrates this problem perfectly. All of the black that surrounds marcie shifts to a dark gray after the conversion process instead of returning to black.

       

      Doing this same test in CS3 and CS4 works as expected - there is no loss of information. Under-blacks, over-whites and all normal range values are preserved.

       

      Any ideas?

       

      thanks

       

      - cd