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How to read the Histogram. A histogram is a graphical representation of the pixels exposed in your image. The left side of the graph represents the blacks or shadows, the right side represents the highlights or bright areas and the middle section is mid-tones (middle or 18% grey).
It uses two columns of data to create a histogram -- one for data you want to analyze and one for bin numbers that represent the intervals by which you want to measure the frequency. Make sure you load the Analysis ToolPak to add the Data Analysis command to the Data tab.Then youâll be ready to create a histogram. Hereâs how: On a worksheet, type the input data in one column, adding a label in the first cell if you want. Be sure to use quantitative numeric data, like item amounts or test scores.ake sure you load the Analysis ToolPak to add the Data Analysis command to the Data tab. Then youâll be ready to create a histogram. Hereâs how: On a worksheet, type the input data in one column, adding a label in the first cell if you want. Be sure to use quantitative numeric data, like item amounts or test scores.