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Daniel Roy
Known Participant
February 14, 2024
Question

Import histogram

  • February 14, 2024
  • 3 replies
  • 7441 views

Team quick question

 

Can I export an histogram values in order to import it into another picture, to colour grade it?

 

I am aware of Image/Adjustment/Match colour but looking to go furhter than that!

    This topic has been closed for replies.

    3 replies

    Earth Oliver
    Earth Oliver
    Brainiac
    February 26, 2024

    Histograms are NOT used for matching color. I'm not sure why you're trying to go down this path, but it's only going to end in failure.

      c.pfaffenbichler
      c.pfaffenbichler
      Brainiac
      February 19, 2024
      quote

      I am aware of Image/Adjustment/Match colour but looking to go furhter than that!

      As Match Color works destructively by default I consider it best to be avoided altogether. 

       

      Have you tried the Filter > Neural Filters > Color Transfer? (Though additional adjustments may be necessary.)

        D
        Daniel RoyAuthor
        Known Participant
        February 22, 2024

        Hello both, apologies I have only the ability to follow up on this over the week-end; due to work during the week. Trevor, Conrad I will revert. Appreciate the help a lot!

        Dan

        c.pfaffenbichler
        c.pfaffenbichler
        Brainiac
        February 22, 2024

        Have you tried the Filter > Neural Filters > Color Transfer?

        Conrad_C
        Conrad_C
        Inspiring
        February 14, 2024

        For color grading in the traditional sense, you probably want to use the technique of creating a color lookup table (color LUT) from a Photoshop document; see the link below. The linked page links to another page that tells you how to load a LUT into another Photoshop document.

         

        https://photoshopcafe.com/make-lut-photoshop/

         

         

          D
          Daniel RoyAuthor
          Known Participant
          February 16, 2024

          Hi thanks Conrad, it's interesting but in whole fairness this has little to do (if anything) with my question.

           

          How could I download the RGB histogram of picture 1 to upload/apply to picture 2...

          Conrad_C
          Conrad_C
          Inspiring
          February 16, 2024

          You can’t.

           

          That’s the whole reason I suggested what I did. Also, you will find that “copying a histogram” from one image to another is a feature that (as far as I know) you will not find in any other photo app by any other company. It’s just not done.

           

          But creating a color LUT from one image to apply to another image is one of the most widely used color grading tools.

           

          Maybe I’m looking at this the wrong way. I should ask, is there a reason or technique that you know of that actually does involve “downloading” a histogram?

           

          Because that’s something I’ve never heard of. A histogram is simply a count of how many pixels are at each level. And in fact it’s one of the least interesting graphs about an image. (For color correction, the clipping indicators, and the waveform and vectorscope used in video editing, are far more informative tools.)

           

          A histogram is just a readout. It’s a little like asking “How do I copy the speedometer reading from this car to that car?” You can’t; if you want another car to match speed you have to adjust the other car’s engine and brakes instead. Or, “How do I copy the temperature from this room to that room?” You can’t, you must adjust the other room’s heating or cooling system instead.

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