PJHTech ImagesPPI and DPI are not the same thing
PPI means pixels per inch. DPI means dots per inch and describes a printer's output. A printer can use several ink dots to reproduce one image pixel.
Use the image calculation
For a 6-inch-wide print from an 1800-pixel-wide image, divide 1800 by 6. The result is 300 PPI. You do not replace that number with the printer's advertised DPI.
When an app calls it DPI
Some dialogs use DPI for the image density field. Check what the control actually changes. With resampling off, changing the density should change the intended print size rather than create more pixels.
Use the print provider's requested image density when it is specified. A higher number is not evidence that missing detail has been recovered.
Related guides
- How to calculate an image's print size
- Can upscaling make a small image sharper?
- Which image format should you send for printing?