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paul9220
Participating Frequently
February 11, 2022
Question

Red Line In Mono Histogram

  • February 11, 2022
  • 2 replies
  • 335 views

Please see the attached image. This isn't a problem but rather a curiousity. 

 

The photo comes from a monochome only camera yet the histogram shows a bit of a red line topping the furthest left part of the histogram. What does this line mean? 

 

TIA

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2 replies

Stephen Marsh
Community Expert
Stephen MarshCommunity Expert
Community Expert
February 12, 2022

If this is in Photoshop, what colour mode is the document in? If the document is in RGB and not grayscale, what does the info panel (set to actual colour) indicate the colour channel readings for that area of the histogram? Does R=G=B or does the red channel have a different value to the other channels?

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    paul9220Author
    Participating Frequently
    February 19, 2022

    I change the mode to RGB to use filters so that's the current mode. I think the group has it nailed. Thanks to all. 

    TheDigitalDog
    TheDigitalDog
    Inspiring
    February 11, 2022

    Clipping (in this case, the red channel). Based on the color space setup in  Workflow options.

    Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
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      paul9220Author
      Participating Frequently
      February 11, 2022

      Thanks. I can't say as I understand it yet but you've given me the push in the correct direction to figure it out. 

      TheDigitalDog
      TheDigitalDog
      Inspiring
      February 11, 2022
      quote

      Thanks. I can't say as I understand it yet but you've given me the push in the correct direction to figure it out. 


      By @paul9220
      There is a video for that:
      Everything you thought you wanted to know about Histograms
      Another exhaustive 40-minute video examining:
      What are histograms. In Photoshop, ACR, Lightroom.
      Histograms: clipping color and tones, color spaces, and color gamut.
      Histogram and Photoshop’s Level’s command.
      Histograms don’t tell us our images are good (examples).
      Misconceptions about histograms. How they lie.
      Histograms and Expose To The Right (ETTR).
      Are histograms useful and if so, how?

      Low rez (YouTube): http://www.youtube.com/watch?v=EjPsP4HhHhE
      High rez: http://digitaldog.net/files/Histogram_Video.mov
      Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
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