Pixels, PPI, and DPI in a Photo-Restoration Project
By ImgHeal · Updated
Separate image dimensions, print planning, and printer terminology before changing a file.
Count image pixels first
An image's width and height in pixels describe its digital dimensions. Record those values before editing. A metadata field labeled resolution can change without adding pixels, so a larger displayed PPI number does not necessarily mean a sharper image.
Calculate the proposed print size
Divide pixels by the intended pixels per inch to estimate inches. A 2400-pixel side at 300 PPI corresponds to eight inches. Printer dots per inch describe a different part of the output process; follow the print provider's requested delivery specifications.
Check actual source detail
Two files with identical dimensions can have very different visible detail. Judge focus, damage, and compression as well as the numbers. Proof an enlargement before a large order, especially when AI has generated detail that the original does not support.
Check before you finish
- Record actual pixel dimensions.
- Distinguish metadata changes from resampling.
Further reading
- Adobe: Set image size and resolutionThe relationship between pixel dimensions, print resolution, and resampling.
Continue with a related guide
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