Different shapes need a decision
An image can have enough pixels for a print and still be the wrong shape. Compare width divided by height for the photo and the target. When those ratios differ, you cannot keep the entire picture, fill every edge, and preserve proportions at the same time.
Take a 4,000 × 3,000 landscape image and a 10 × 8 inch print. The image has a 4:3 ratio; the paper has a 5:4 ratio. Rotating both does not remove the mismatch. Stretching to force a match would change the shapes of people and objects, so crop and fit offer more useful choices.
Crop fills the canvas
Keeping the full 3,000-pixel height requires a 3,750-pixel width for a 5:4 crop. That removes 250 pixels across the width, or 125 from each side for a centered crop. The remaining 3,750 × 3,000 image supplies 375 PPI at 10 × 8 inches.
Inspect what those removed strips contain. A centered crop can cut a hand, a signature, or a person standing near the edge. Check the actual preview instead of relying only on a percentage. Leave additional breathing room around important details if the frame or print provider might conceal part of the edge.
Fit keeps the whole composition
Fitting the same photo across the 10-inch width produces an image 7.5 inches high. A centered layout therefore leaves a quarter-inch border above and below on the 8-inch canvas. At a 300 PPI output setting, the canvas is 3,000 × 2,400 pixels and the photo occupies 3,000 × 2,250.
Choose a background deliberately, particularly when a transparent source will become a JPG. The border is part of the composition; it is not bleed artwork for trimming.
Check the last printing step
A browser preview cannot control the printer. Select the intended paper dimensions and review any automatic fill, fit, scaling, or borderless settings. Some borderless modes enlarge the picture slightly beyond the paper and can trim edges even when the file ratio matches. Avoid applying a second crop without noticing. For an important order, send a representative file first and confirm how the provider handles borders and the final visible area.