PPI is Imaginary! PPI vs DPI vs Resolution

A video on YouTube. In Photography & Film, a Krater category.

Summary by Krater

This video explains the concept of pixels per inch (PPI) in digital images and print, demonstrating why PPI is an imaginary unit of measurement when applied to digital files. It concludes that PPI only becomes relevant when physical dimensions are involved, such as printing on paper.

From the video

Answers: What is PPI and why does it not matter for digital images?

pixels per inch resolution
digital image dimensions
ppi vs dpi
photoshop document setup
physical vs digital pixels

What it concludes

PPI is an imaginary unit of measurement for digital images because pixels have no physical size.
Changing the PPI setting in Photoshop without resampling does not change the pixel dimensions or quality of the image.
PPI is only relevant when printing images on physical paper or media with fixed dimensions.
DPI refers to printer capabilities and physical dots per inch, whereas PPI refers to digital pixels assigned to physical dimensions.

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