The histogram equalization process is an image processing method to adjust the contrast of an image by modifying the image’s histogram… A high contrast scene is one where there are lots of very dark, and very bright tones, and perhaps not so many tones in between. Totally workable if you want a flatter look, or something to start from scratch with. The custom setting is a high-contrast setting. A high dynamic range scene is essentially a high contrast scene. This is a typical high contrast scene, perhaps as in the example, a dark dog on snow. Most of its pixels are at the ends, and the peak value occurs on both the left and the right extremities. A histogram that is divided into separate columns of dark and light tones, with very few medium tones in between, indicates a very high-contrast rendering. Contrast and ‘Mountains' in Histograms. When you look at the histogram, you should see the graph stretched into both directions. the details in the image are now much more perceivable to us and thus yields a high contrast image. A low-contrast (left), medium-contrast (center), and high-contrast (right) version of the same photograph. A low contrast image has one, only one peak, and its position is at the density level of the low contrast image, while the rest of the histogram might be flat at the bottom. A very high contrast histogram can have two peaks, one far to the right, the other far to the left. So, for the high contrast, the image histogram should span the entire dynamic range as shown above by the right histogram. If you come across this type of scenario, try to keep the light to the right side of the graph. The right histogram increases this gap between the intensity values and Whoo! In this case, your histogram will show data on the left and right, and not so much in the middle. ... with each one accompanied by its histogram. The image in the center is direct from the scanned negative, and the only modification I made to create the other images was increasing or decreasing contrast. Like I mentioned, high contrast focuses on the brights and darks of a photo. If you were to look at the histogram, a normal photo covers the highlights, shadows, mid-tones and everything in between. The histogram displayed in the viewfinder is based on this. Histograms of digital images provide a graphical representation of image contrast characteristics and are useful in evaluating contrast deficiencies such as low or high contrast, or inadequate dynamic range. Histogram Equalization. High Contrast. The histogram in Figure 6 shows the image has almost no shading, only a flat area of white, and a flat area of black. You will find some shots will have a very tall, very steep mountain somewhere in the center of the graph. High contrast histogram is also very typical. Explaining High Contrast. This is the RAW histogram for the same image. High Contrast Scene. Manipulation of the histogram can correct poor contrast and brightness to dramatically improve the quality of digital images.