You can crop irregular data regions from image files.
To crop a rectangular region to a new file:
Open an Image window. From the Image window menu, choose File | Save.
In the Input field, enter either a window number or an image file name. In the Output field, specify an image file or window as output.
If your input is a window, you can select a region. To do this, click Select Region and drag the mouse across the area to select it. Adjust the rectangle that you've created until it contains the desired area. Then click outside the Image window with the mouse.
Click Details to open the Region Details window.
In the Z (Start/End/Inc) field, select a Z section range to include. Start and End are the beginning and end points. Inc allows you to skip points (e.g., entering an Inc value of 2 skips every other point).
In the Time(Start/End/Inc) fields, select a time data range to include. Then click Close.
In the Save File dialog box Wavelengths field, choose which wavelengths of the input data to process and include in the output data set. If you don't have the option of which wavelength to include, the toggle buttons are dimmed.
Click Do It to save the file. Then open it and view the results of the selections.