Row Profile Plot

A Row Profile plots the pixel values along a line parallel to the image rows. The row(s) to be plotted are located using the Image Cursor. This type of plot shows changes in image intensity (or "pixel value") in the horizontal direction. The X axis of the plot measures the column number in the image. A column profile plot can also be created using the Line Profile tool to draw precisely along a single row (hold down the Shift key while drawing).

World Coordinates

If the image has a World Coordinate System calibration, moving the pointer along the plot X axis reflects the world coordinate change in column number along the image X axis. The same image pixel value applies at a given column number regardless of the plot Y value.

Types of Row Profile Plots

This command plots the following types of profiles:

Single Row
Averaged Row. Various methods are available for averaging the rows; see Plot Averaging Mode.
Range of Rows showing multiple rows on the same graph.
If the Image Window contains an Image Set, Mira can make the above types of plots for the entire image set or for only the top image; this is controlled by the state of the Graph Image Set mode of the Image Window.

The Window Caption describes the type of plot that is displayed:

An Average Row Profile plot has the suffix [ARP] in the window caption.
A simple Row Profile of one row has the suffix [RP] in the window caption.

To plot a row profile:

Adjust the image cursor to cover the desired pixels, and
Click the plotting button or executing the menu command to create the plot.
Use the procedures below to plot a single row, averaged row, or range of rows.

Procedures

Plotting a Single Row

Set the command mode to Cursor Mode.
Click the mouse on the image to position the Image Cursor.
Adjust the corners or edges of the Image Cursor until it defines the region you wish to average. Combine moving and sizing operations to get the image cursor where you want it.
Execute the Plot > Row command in the menu or click the button to make the plot. Alternatively, you can use the 'H' (horizontal, row) keystroke command when the Image Window has focus.
The Plot Bar world coordinates refer to the image along the plotted row.

Plotting an Average Row

Mira can collapse the neighboring rows and plot the result as a single line of data. Mira provides different options for combining the adjacent lines to create the plot; see Plot Averaging Mode.

Set the command mode to Cursor Mode. If the image cursor is a rectangle, it outlines the region to be averaged into a single row. If it is a crosshair, the averaged region is the number of rows spanned by the crosshair. In both cases, the same number of rows will be averaged.
Combine moving and sizing operations to get the image cursor where you want it. Click the mouse on the image to position the cursor and adjust the corners or edges until it defines the range of rows to average.
Select the row combining method by choosing an option in the Combine Mode submenu of the buttons' drop menu or use the image Plot menu or Image Context Menu. The name in the menu adjusts to the selected method.
Execute the selected [Average Row] mode from the menu. The plot title depends on the currently selected Averaging Mode. Also see Plotting an Averaged Line.
The Plot Bar world coordinates refer to the image along the average row location.

Plotting a Range of Rows

This command plots all rows inside the image cursor box to view them simultaneously or as an animation.

Set the command mode to Cursor Mode. If the image cursor is a rectangle, it outlines the region of rows to be plotted. If it is a crosshair, the span of the crosshair defines the number of rows to be plotted. In both cases, the same number of rows will be plotted.
Combine moving and sizing operations to get the image cursor where you want it. Click the mouse on the image to position the cursor and adjust the corners or edges until it defines the range of rows to plot.
In the plotting menu set the Plot Series Mode to Overplot and then use the Range of Rows command. You can later change the Plot Series Mode from the Plot Window using its Context Menu.
The Plot Bar world coordinates refer to the image along each plotted row within the range.

Changing the Plot Appearance

After you have made the plot, its properties can be changed using the Plot Properties dialog. This includes properties such as the minimum and maximum extent of the axes, the tick marks, axis labels, fonts, colors, and more.