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Understanding Histograms

Understanding Histograms. Anderson VMC DPH31G. What are histograms?. Histograms are a graphic representations (a picture) of the tonal value for each pixel in your photo.

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Understanding Histograms

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  1. Understanding Histograms Anderson VMC DPH31G

  2. What are histograms? • Histograms are a graphic representations (a picture) of the tonal value for each pixel in your photo. • The horizontal axis of the histogram corresponds to a gradient of increasing lightness from black to white (left to right) • The height of the histogram represents the number of pixels within a given lightness value.

  3. Reading histograms • Most images should show a distribution of tones across the full range of the histogram. • The locations of peaks and troughs (highs and lows) will vary depending on whether the image contains mostly light or dark tones.

  4. Camera versus editing suite • The on-camera histogram is the most accurate gauge of your exposure. • Normal histograms will show peaks and troughs within the margins of the histograms. This data can be edited after exposure (Lightroom, Photoshop, iphoto). • Abnormal histograms have cliffs (no data/detail is detected) in highlights or shadows. This typically cannot be corrected in editing.

  5. Compensating +/_ exposure key • When in doubt, slightly overexpose. • Expose to the right • This is because the camera’s sensor does not give equal weight to all tones. Digital sensors are heavily weighted to the brightest areas in your photo. • The sensor lumps all the shadows on top of one another making for a choppier greyscale.

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