In the Profile Graph window, you can view the graph plotted from the information corresponding to the overlaid vector and the values displayed in the Profile Table window.
The graph is a profile of the channels you selected in the Profile column of the Profile Options window.
The vector profile is interpreted from left to right; however, if the end points of the vector occupy the same x-position, the profile is interpreted from the top down. With closed shapes, the profile is interpreted clockwise from the start/end node.
Gray-value changes are shown as a function of distance along the vector. The graph gives a profile of the image layer and the distance along the vector on the x-axis. With Sample points selected in the Profile Options window, an 8-bit RGB-image layer shows a range along the x-axis of 0 to 255 and represents the 256 possible gray-level values for each pixel of the red, green, and blue input channels. Both 16-bit and 32-bit real raster data can be graphed showing the 16-bit and 32-bit range of values.
With Georeferenced selected in the Profile Options window, the x-axis is measured in meters and represents the distance between the end points of the vector. The range of the x-axis depends on the length of the vector and the scale of the area or the ground distance covered by the image.
The y-axis of the graph shows input channels plotted with the gray values.
The Mensuration bars area of the Profile Graph window displays the position of the mensuration bars for the active channel in pixels or in scale distance along the vector, depending on the View option selected in the Profile Options window.
You can move the mensuration bars on the graph as follows by dragging the left side of the graph to the right.
For more information, including options for how the graph displays, see the following, as applicable:
© PCI Geomatics Enterprises, Inc.®, 2026. All rights reserved.