The Image Scaling function performs two tasks. It compares two or more images to each other using their relative sizes. It can also show the actual size of an image in reference to the dimensions in the Viewable Screen Area, which are defined by width and height in the Measurement and Scaling tool.
Bring two or more images into the Image Workspace.
Define the width and height for each image. Follow the instructions for defining width and height located in Measurements and Scaling. Once all the height and width for all the images are defined, click on the Relative Size button on the Measurement and Scaling tool. The images in the Image Workspace will now change sizes relative to each other. You may need to open an image using the Select and Move Image function on the Image Workspace Tool to compare the relative size of the images.
Measurement and Scaling Tool
Find Distance/Area of an Object