I want to resize an Image for printing at 300 resolution in Photoshop, to 2 1/4 inches × 2 1/4 inches (square) In the document size dialog box. How do I enter the correct numbers to get the desired 2 1/4 × 2 1/4 inch image size? How do I divide one inch in points to get the ¼ inch?
Adobe Photoshop uses 72 points in an inch. So 1/4 inch equals 18 points. In your 2-1/4 x 2-1/4 inch example, resize to 162x162 points. If you are working in pixels, at a 300 ppi resolution, you'd resize to 675x675 pixels.