Histogram

The Histogram feature allows you to quickly evaluate the quality of your image by displaying the distribution of gray values in the image.

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Overview

To open or close the Histogram pane, click the Histogram Button button in the toolbar.

Histogram Pane

The graph shows you the number of pixels per gray value.

The X-axis represents the gray values, ranging from 0 to the maximum gray value. The maximum gray value depends on the pixel format selected.

The Y-axis represents the number of pixels (in percent of all pixels in the image) with that particular gray value.

To get more information about the distribution of gray values, move the mouse pointer over the graph:

Histogram Tooltip

In the example above, the tooltip shows that in the current image, there are 92517 red pixels, 82638 green pixels, and 42643 blue pixels with gray value 125.

Displaying Data

Exporting Data

Panning and Zooming

Panning and zooming allows you to look at specific areas of the histogram(s) in more detail.

To zoom in or out, hold down the Ctrl (Cmd) key and scroll the mouse wheel while the mouse pointer is over a histogram.

When zoomed in, you can click and hold the left mouse button to pan.

Panning and Zooming Animation

To reset the zoom level, click Reset Axes.