How To Get Consistent Results With Your Histogram (Camera Lesson 30)

Summary: For those times when you’re stuck using your camera’s histogram- here’s how to get consistent results for images in your film.

Length: 2:49 minutes

Depth of Field, Part 1: How Aperture and ISO Affect Focus
Your Guide To High Speed, Part 6: Five Tips For A Successful Shoot
Your Guide To High Speed, Part 5: Lighting Six High Speed Sets
Your Guide To High Speed, Part 4: Common Lighting Problems
Your Guide To High Speed, Part 3: Camera Operation & Workflow
Your Guide To High Speed, Part 2: Frame Rate
Your Guide To High Speed, Part 1: Introduction
12 Crucial Questions Before Lighting Your Set (Cinematic Lighting Lesson 15)
Negative Fill: The Best Kept Secret (Cinematic Lighting Lesson 08)
5 replies
  1. price76
    price76 says:

    Hi Ryan,

    I’m a little confused regarding the middle grey calibration more specifically in relation to DSLR cameras which seem to put middle grey at 40-45 IRE(I am using a 5dmkii and 7d and seem to be getting 45 IRE when I follow your above advise and use the in-camera spot meter to be bang on 0, or zone V off 18% grey card, also my exact IRE readout for middle grey came from using the magic lantern spot meter in IRE mode once I had got 0 on the in-camera spot), so when I do this of course the histogram reading is slightly to the left of middle as one would expect. My first question is (after that convoluted explanation) do I run with using 45 IRE as middle grey or bring up my exposure to 50 IRE for this calibration from the key light source? If not and I set middle grey to 45 IRE are my IRE target values you discussed (skin tone and all the others) needing to be all brought down by 5 IRE?


    • Ryan E. Walters
      Ryan E. Walters says:


      Great observation. 🙂 And here is where artistry, personal preference, and scene content come into play. You can go with 40 IRE, 45 IRE, or 50 IRE- it is up to you. Regardless of which one you choose, just stick with that reading and you’ll get consistent results with your histogram / waveform.

      If you choose 40 IRE:
      You’ll be very slightly underexposing your image. (Maybe by 1/3 – 1/2 of a stop at most.) What that means is that there will be more room in the overexposure part of the image (See Lesson 28: Properly Exposed & Lesson 32: Advanced Exposure.) So your highlights will roll off more smoothly- they will not clip as fast or as harshly. However, if you want to bring up the levels in the grade, the mid-tones and the shadows will be more noisy- which may be objectionable to you. Depending on the look you are after, 40 IRE would probably be a better choice for a scene with a lot of highlights. (Zone 9 & 10)

      If you choose 45 IRE:
      You’ll be ever so slightly underexposing your image (or it may be spot on) by about 1/3 of a stop or less. Same rules apply as the 40 IRE exposure, only there will be less room in the highlights, so they will clip faster, and not roll off as smoothly. Again, depending the look you are after, 45 IRE would probably be a good choice for a scene with some highlights. (Zone 9)

      If you choose 50 IRE:
      You’ll be either “correctly” exposing your image, or very slightly overexposing your image by about 1/3 of a stop or less. In this case, your highlights will clip faster, and not roll off as smoothly as 45 or 40 IRE. However, your mid-tones and your shadows will be cleaner then if you had used 40 or 45 IRE. So, depending on the look you want, 50 IRE would probably be a good choice for a scene with little highlights in it. (Zone 9)

      What if you like 40 IRE, and you want clean mid-tones & shadows?
      Well, that is where you’ll have to do some additional lighting, and our Lighting Series comes into play. 🙂

      As you can tell, there is just as much personal choice as there is technical “correctness”. The technical level is a good place to start. But don’t get hung up on just the technical- the look of the image and what you are after is just as important.

      I hope that helps.


    • Ryan E. Walters
      Ryan E. Walters says:

      Yep, it gives you the same exposure as using a light meter. My preference is to always use a light meter, but I know that’s not everyone’s thing- and this trick works just as well.

      (Technically you are still using a light meter with this trick- you are using the light meter built into the camera. 🙂 )

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