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Levels override curves? Need help

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  • peter Frings
    AFAIK, the level b/w points (on the bottom of the "level" tool) defines the range of the input values (after exposure, contrast, HDR, etc.) that is then spread (mapped) to the full range (which is defined by the points on top of the levels histogram). So, if the levels map 230 (input=bottom) to 255 (output=top), the histogram in the curves tool will stretch, and the 230 value of the input becomes the new 255 in the curves. So, the read-out will show values that are higher than 230 (and the "Histogram" tool shows the full range as well).

    I.e., the curves tool operates "after" the levels tool has mapped the range. And the bottom points represent then input while the top ones represent the output (which is a bit contrary to how the tools are arranged from top to bottom; you'd expect the input to be on the top and the output at the bottom).

    HTH, otherwise I completely misunderstood your question 😊

    Cheers,
    Peter.
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  • Ian Wilson
    Moderator
    Top Commenter
    peter.f wrote:
    AFAIK, the level b/w points (on the bottom of the "level" tool) defines the range of the input values (after exposure, contrast, HDR, etc.) that is then spread (mapped) to the full range (which is defined by the points on top of the levels histogram). So, if the levels map 230 (input=bottom) to 255 (output=top), the histogram in the curves tool will stretch, and the 230 value of the input becomes the new 255 in the curves. So, the read-out will show values that are higher than 230 (and the "Histogram" tool shows the full range as well).

    That's right.

    I.e., the curves tool operates "after" the levels tool has mapped the range. And the bottom points represent then input while the top ones represent the output (which is a bit contrary to how the tools are arranged from top to bottom; you'd expect the input to be on the top and the output at the bottom).

    Except that if the input was at the top and output was at the bottom, how would you easily pull the sliders in to the edges of the histogram?
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