Hello there, @wheatley ...
If you want to resize your image for your course card to fit the dimensions of 262 x 146 pixels (as outlined in How do I add an image to a course card in the Dashboard?), you will need to edit your image outside of Canvas using a graphics editing program on your computer. If you are on a Windows environment, you could use something as simple as the "Paint" program that is included in the Windows operating system. Once you've resized the image, you can then upload it using the Guide I've linked above.
I hope this helps, Kathleen. Please let Community members know if you have any other questions about this. Take care...be well, and stay safe.
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