Levels / Curve histogram behavior

Phillip Bond

• November 30, 2017 14:50

[I'm putting this question under Capture One 11 but I have noted the same behavior under Capture One 10]

When I make changes in the Levels tool the main histogram and the histogram in the Curve tool reflect those changes.
However when I make changes in the Curve tool the main histogram reflects the changes but the histogram in the Levels tool does not update.

Is this behavior deliberate? If so, what is the reason for this behavior?

Thanks,
Phil

0

• 

  Christian Gruner

  • November 30, 2017 15:02

  Is it as designed yes.
  It is because of the order of adjustments in the processing pipeline. Curves are after the Levels-adjustments in the pipeline, therefore you don't see a change in the Levels histogram, when you adjust Curves.
  
  - For the output histogram, take a look the Histogram Tool. This shows a histogram with adjustments and color profiling or film curves applied.
  - For an Input histogram, use the Exposure Evaluation Tool. This shows the raw histogram, with no adjustments, and no color profiling / film curves.

  0
• 

  Phillip Bond

  • November 30, 2017 16:06

  Christian,
  
  Thank you. Understood.
  
  Correct me if I’m wrong, but after making adjustments in the curves tool, the histogram overlay in the levels tool no longer reflects the actual image data, correct? Why, then, include that overlay? How should I interpret it?
  
  Thanks,
  Phil

  0
• 

  Paul Steunebrink

  • November 30, 2017 20:41

  [quote="PhilBond" wrote:
  ...
  Correct me if I’m wrong, but after making adjustments in the curves tool, the histogram overlay in the levels tool no longer reflects the actual image data, correct? Why, then, include that overlay? How should I interpret it?

  
  As Christian said, the tools have their position in the processing pipeline.
  
  The Levels tools comes before the Curve tool, like a train with carriages. Some tools affect the Levels tool's histogram as they are earlier in the pipeline (Exposure, HDR) and vice versa.

  0

Post is closed for comments.