Resolution & Pixels

The building blocks of a digital image — pixels and resolution, aspect ratios, megapixels, DPI and pixel density, and scaling images up and down.

The photo-editing numbers, made simple — free calculators for image resizing, aspect ratios, DPI and print size, megapixels, file size, and aspect-ratio cropping, plus plain-English guides to resolution, file formats, color, and the basics of editing software.

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Resolution & Pixels

Pixel

Dots per inch

1080p

Subpixel rendering

Dead pixel

Retina display

Digital zoom