Pixels Per Unit: Images Tab
Use the Load File Image button on the Images Tab on the Visualize Editor to load a saved digital Image.
You will be prompted for the Image Scale (Pixels Per Unit) for this particular image file.
If the image file loaded is a different Size than the last file loaded, it will ask you to set the Scale using Pixels Per Unit (the current Unit of Measurement) for the Image.
If you are using Inches, it will be Pixels per Inch.
Enter the number of Pixels Per Inch and click OK.
Optionally, click the Set as Default checkbox to set this size as the default size.
Pixels Per Unit