Tutorial: Digital Art and Image Size Terms

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What do “pixel”, “screen resolution”, “image dimension”, “PPI”, “DPI”, and “high resolution image” mean, and why should you care?

Quick note: The screenshots in this tutorial come from Photoshop CS2, but there should be something similar in most digital art programs.

Pixels

A pixel (picture element) is a single, tiny square of color, the smallest unit displayed on a computer monitor. It is common for digital artwork to be done as a raster-based (aka bitmap) image – that is to say, it is comprised of a grid of individual pixels.

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