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Lossless compression

Reducing file size while keeping the data byte-for-byte recoverable.

Lossless compression encodes repetitions more compactly, so unpacking returns the exact original. PNG, TIFF with LZW and ZIP archives work this way.

Shrinking a file by discarding data the eye barely notices.

PNG file format: extension, MIME type and available conversion directions.

An image stored as a grid of pixels, each with its own colour.

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