The Way Eye Sees It

If you don’t fully understand the purpose and useful functionality of a histogram, you’re not alone. I would venture that most folks who edit digital images really don’t understand what the little mountain range chart is telling them or how to make use of that information. This Image Tonality and the Histogram series will present a fairly comprehensive look at image structure using the histogram as a barometer. Within this session I will refer to the histogram simply as a tone map, because… that’s what it is.

The histogram is a tone map that displays the dispersion of tones within an image, and it is critical that we understand what the map information means. This tonality discussion lies at the very heart of image preparation; and is fundamental to all image presentation. In fact, the establishment of an image’s tonality is the foundation upon which color is supported. Before you hang any…

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