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# View Histogram

The Histogram functionality allows you to quickly evaluate the image quality by viewing the real-time distribution of different color channels (for color camera) or the real-time distribution of gray values in the images (for mono camera).

Note:

The following text only takes viewing the histogram data of color camera for an example.

Start acquisition and then click to open the Histogram window.

Figure 1 The Histogram Window

View Mode

  Set the view modes, including Histogram, Line Profile and Column Profile.

  Histogram
    Axis X

      Set the value range of the axis X of the histogram.

  Line Profile
    Location

      Display the coordinates value of your cursor when you moving your cursor on the images.

    Line Axis

      Set the value range (0 to the horizontal resolution of the image) of the selected line which is parallel with the X axis.

    Figure 2 Line Profile Mode
  Column Profile
    Location

      Display the coordinates value of your cursor when you moving your cursor on the images.

    Column Axis

      Set the value range (0 to the vertical resolution of the image) of the selected line which is parallel with the X axis.

    Figure 3 Column Profile Mode
  ROI

    Click and then drag the cursor on the image to draw a ROI. After that, the histogram only displays the color channel distribution or gray value distribution within the ROI.

    You can click to cancel the ROI settings.

  Logarithmic Scale

    Switches between a linear and a logarithmic view of the data.

You can do the following operations if required.

Table 1 Available Operations
Operation | Description
--- | ---
Panning and Zooming | Panning and zooming allows you to look at specific areas of the histogram in more detail. Panning: Drag the cursor on the histogram to pan the histogram. Zooming: Move the cursor to the histogram and then scroll the mouse wheel to zoom in or zoom out. Scan the QR code to view the video clip which shows panning and zooming.
Select Color Channel for Display | If the camera is a color camera, you can check the checkbox(es) in the table, the selected color channel's real-time distribution will be displayed on the histogram.
Export Histogram Data | Click Export to export the histogram data to the local PC.
Restore X | Click Restore X to restore the coordinates if you have zoomed the histogram.