![]() ![]() Using histograms to assess the tonality of images takes practice, but the fundamentals are straightforward. No tones lay outside of the histogram, although one exception to this will be discussed in a few pages. The middle parts of the histogram depicts the gray or medium tonality areas. The left side of the histogram is 0, or black, and the right side is 255, or white. No light hitting a pixel on the sensor registers as 0, which will be rendered black, 126 is a medium value, and 255 is white. If you set it to show while you are shooting you get instant feedback of your tonality and exposure, but it also somewhat limits the view of your scene.Īs covered in the Sensor chapter, when light hits a sensor, brightnesses are assigned numbers, which are called levels. You can set your camera to display a histogram either before the image is taken and/or during review of an image. They can be found in almost any image editing programs and on the camera itself. ![]() Unlike an image, a histogram is undistorted by such things as the light with which you are viewing the image, screen brightness, and tonal relationships. Histograms are important because they give a definitive view of the tonality of an image. When you put all the brightnesses closely together you get what look like the typical hills you see in a histogram. ![]() The more pixels of a certain brightness, the higher the line on the graph. The frequency is the number of pixels of each brightness, and is represented by the height of the graph. In photography the values are the brightnesses of the pixels from dark on the left to light on the right. \)Ī histogram (at top right) is a graph which shows values and frequency. ![]()
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