Mac/macOS FAQ: How do I print an image to a specific size in inches or centimeters using macOS?
Briefly

Unless proficient with Mac Terminal, utilize Gimp on macOS to print images in inches, centimeters, or various other size options, easily set through the Image Settings tab in the Print dialog.
Gimp allows modification of image sizes for printing on macOS, offering choices like inches and centimeters along with additional options such as points, picas, and millimeters.
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