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Oleg29648376dbg1
Participating Frequently
July 20, 2023
Question

Why in Adjustment Layer Brightness/Contrast in PS checkbox "Use Legacy" does not affect on result?

  • July 20, 2023
  • 2 replies
  • 807 views

I was surprised to find that when using an adjustment layer, the Legacy checkbox does not switch the function to the old mode. As I understand it, Legacy mode is simply not available through an adjustment layer (except for files created in older versions of PS). Then it's an interface flaw if I can include the selector itself, but it doesn't affect the algorithm?
Note: Through the main menu of Legacy, the mode is correctly turned on and off

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    2 replies

    D Fosse
    Community Expert
    D FosseCommunity Expert
    Community Expert
    July 20, 2023

    The legacy mode, just to clarify what it is, is a plain offset of values that will clip high and low values. The current mode uses a curve instead, with a falloff so that highlights and shadows are protected.

     

    Either mode is easily reproduced by Levels or Curves, both of which give much more control over the final result. Brightness/Contrast is a blunt instrument.

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      Oleg29648376dbg1Author
      Participating Frequently
      July 20, 2023

      I am in no way questioning the benefits of the current version of Brightness/Contrast.
      However, it is often more convenient for me to use Legacy to correct masks through a script.
      This post is about the strange behavior of the Legacy checkbox in an adjustment layer.
      If it is left in the interface as a signal to the user of the file which of the algorithms will be used by this layer - then why can it be turned on / off since it does not affect anything?

      Bojan Živković11378569
      Community Expert
      Bojan Živković11378569Community Expert
      Community Expert
      July 20, 2023

      It does switch and produces different result from my testing. Can you show us comparison like one below?

        O
        Oleg29648376dbg1Author
        Participating Frequently
        July 20, 2023

        Try this attached file
        Result main menu:

        Result adjustment level:

         



         

        O
        Oleg29648376dbg1Author
        Participating Frequently
        July 20, 2023

        Checking »Use Legacy« makes a difference (compare my screenshots from before) – so something is being done, apparently not what should be done … 


        I was so focused on the contrast that I did not pay attention - yes, the brightness range changes from -150..150 to -100..100. But CONTRAST, as we have seen, works in an adjustment layer incomprehensibly when Legacy is on.

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