How can I cut the corners off a rectangular image?

I have a rectangular image and I would like to cut the edges off for screenprinting. I want it to be a tall rectangle with corners cut off at 45 degrees, so that it looks like a tall octagon.
Obviously, I want the corners to disappear completely (not just be white corners), for screenprinting.
I am new to PS.
Thank you

Image files have a rectangular Canvas size. Some Image file formats support transparency like .PGN. Support color profiles and 8 and 16bit color. It easy to create a Photoshop document without a background layer or one that visibility is turned off and save a png with transparent areas. Here I opened a RAW file as as smart object. Added a white layer mask laid our two vertical guides at 10% and 90% Use the polygon lasso to selected the four corner at the guides lines at a 45 degree angle and filled the selection with black to mask off the corners.

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How can I cut the corners off a rectangular image?

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