In photography, it is difficult to acquire the correct exposure and not have an image overexposed or underexposed. The easiest way to do this is using the histogram. The histogram tells the photographer where the light is.  Some examples of this are below. The first histogram and picture are underexposed. That is why there is a sharp ascent at the left of the histogram. The next picture is overexposed. This time, the ascent is on the right. This tells the photographer it is overexposed. The third picture is correctly exposed. The fourth example shows a high contrast picture. The histogram for this picture at the right side of the photo but only a small part of the picture is actually overexposed. However, this is to be expected when taking pictures of high contrast subjects such as snow. This is where HDRI comes in handy (see previous post on HDRI by clicking here).
histogram example

By Daniel Hancock

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