Go into your Resource Library, find the image used in your site. Click on "attribute" that corresponds with your image (Fig 1):
Fig 1: Attributes in Resource Library
There you will find a table with the Dimensions as HEIGHT/WIDTH (Fig 2)
Fig 2: Attributes Table.
Right click and select "Save image as..."
Save it to your local computer drive. When it is finished, open the image in your photo viewer, like Windows Photo Viewer or Preview on Mac. Then right click and click "Properties". There you will see the image's dimensions. (Fig 3)
Fig 3: Properties on Computer
Visit your website and find your image. Right click the image, and select "Open Image in a New Tab" (Fig 4)
Fig 4: Right clicking image
Then a window will pop up displaying the image. The image size will be in the tab, hover over with your mouse if you cannot see it and a tool tip will appear (Fig 5).
Fig 5: Tool Tip with Image Size
This site has a LOT of functionality and abilities. Here are just some basics to get you started:
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