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### Displaying and hiding the histogram and LUT function graph

While adjusting the image contrast and brightness, you can display and hide the following items in the Window/Level panel:

| • | The histogram that depicts the frequency distribution of image intensities. The horizontal axis in a histogram shows the pixel values; the vertical axis shows the pixel count.

| • | LUT function graph. The horizontal axis shows the pixel values; the vertical axis shows the display values.

The histogram and LUT function graph are drawn within the possible physical range. They are updated when you change the Window/Level values and/or LUT function.

Note: The histogram and LUT function graph are intended for presentation purpose only. You cannot use them to change the image contrast and brightness.

Steps for this task

To display or hide the histogram and LUT function graph:

| 1. | Click the image whose histogram and LUT function graph you want to display or hide.

| 2. | Click the W/L icon on the main toolbar.

The Window/Level panel is displayed.

For other ways to display the Window/Level panel, see step 1 of Specifying the Window/Level scope.

| 3. | Do one of the following:

To... | Do this...
Display the histogram and LUT function graph |
| • | Click Show Graph.
Hide the histogram and LUT function graph |
| • | Click Hide Graph.

The histogram and graph are displayed or hidden accordingly.

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