In photography histogram is a bar graph with a graphical representation of the distribution of tones in an image. Horizontal such a timetable is grayscale from totally black (0) to pure white (255), and the vertical – the relative number of pixels with specific brightness. Range of values for each image is represented in the histogram in the form of successive vertical lines that stretched from left to right – from the darkest to the lightest. Accordingly, the height of each line gives the photographer the opportunity to see how many points a particular shade is available in a given image. To fully black image histogram will look like a vertical column on the left, for a completely white – a column on the right, for a picture with all the gray tint – strictly in the middle column.

For real same photograph histogram will represented as a kind of curve. Thus, as an array of data here is the image itself, where each individual pixel sends its value of light received from each optical channel. These average values and sees a photo display digital camera as a graph, which measures the tone features a frame, its overall tone and brightness. Balanced (normal) image How to use histogram? If the picture will be lost either bright or dark tones, the histogram will respectively go to the right or left. By comparing the display digital camera with a histogram can be easily understood What specific areas of the image are the cause of the bands on the chart.