How can I measure grayscale intensity values over an image using the same ROI?

Technical Note: 204
Reads: 8260
Creation Date: 07/03/2001
Modification Date: 12/02/2004

Go to the Image menu and choose "Start Recording ...". Draw the ROI on the image , hold down the "Apple key, click the mouse button to grab the ROI and drag it to another part of the image that you wish to measure, let go of the mouse button to make the measurements. The measurements are then recorded in the Measurements table.