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Thumbnail

A thumbnail is a reduced-size version of a picture or video, used to help in recognizing and organizing them, serving the same role for images as a normal text index does for words. In the age of digital images, visual search engines and image-organizing programs normally use thumbnails, as do most modern operating systems or desktop environments, such as Microsoft Windows, macOS, KDE (Linux) and GNOME (Linux). On web pages, they also avoid the need to download larger files unnecessarily.

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Source: Wikipedia · Image: Wikimedia Commons · CC0

PIXCS

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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Every museum entry, image, and fact is drawn from Wikipedia and Wikimedia Commons, used under public-domain and Creative Commons licenses.