A graphic representation of the range of tones from dark to light within a photo. Some digital cameras include a histogram feature that enables a precise check on the exposure of the photo.
a bar chart graph that shows all of the tones in a digital image. A photographer can use a histogram to understand and manipulate exposure. Many digital cameras have the ability to show the photographer a histogram of an image he or she has taken. Most image editing applications can create a histogram for an image. A well-exposed photograph will appear as a bell curve, with lower values at the dark and light ends. If the image contains a deep shadow area, there will be high values at the dark end of the graph indicating loss of shadow detail. If there is a white area in an image, there will be high values at the light end, implying loss of highlight detail. If there is nothing shown at the dark and light ends, the photo lacks contrast.
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A histogram is a bar graph analysis tool that is used to identify contrast and dynamic range of any image. Histograms are found in the more advanced digi-cams and software programs (graphic editors), such as Adobe Photoshop 7, CS or Elements, and are used to manipulate images. The histogram shows a scale of 0 255 (left to right) with 0 being black and 255 being white.
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– The histogram is a visual representation of how the highlights and shadows are distributed in your scene, with the edges representing the extreme highlights on the right and shadows on the left. Ideally, it should display as a bell curve, with most of the scene falling in a middle level of brightness. A histogram skewed toward the light or dark side of the range can indicate if your picture will be too contrasty, dark, flat or overexposed. Many cameras can display a histogram in the image preview so you can adjust settings beforehand. The image playback mode on the camera, as well as photo-editing programs, often display the histogram as a guide to the edits that will improve the look of the photo.
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A chart with a vertical scale showing the tonal values of a digital photo. .
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A visual representation of the exposure values of a digital image. Histograms are most commonly illustrated in graph form by displaying the light values of the image s shadows, midtones, and highlights as vertical peaks and valleys along a horizontal plane. When viewing a histogram, the shadows are represented on the left side of the graph, highlights on the right side, and midtones in the central portion of the graph. For more on this subject, see the explora article, ://www.bhphotovideo.com/explora/photography/tips-and-solutions/how-read-your-cameras-histogram How to Read Your Camera’s Histogram.
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Graphical display of data, in digital imaging a chart displaying tonal range -- maximum range of light values camera can capture -- in an image as a series of vertical bars.
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