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This article will explain in detail what the webp format means. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Webp is a picture file format that provides both lossy compression and lossless compression. WebP has both static and dynamic modes, of which dynamic WebP (Animated WebP) supports lossy and lossless compression, ICC color configuration, XMP interpretation data, and Alpha transparent channels.

WebP (pronunciation: weppy) is a picture file format that provides both lossy compression and lossless compression (reversible compression). It is derived from the image coding format VP8. It is considered to be a sister project of WebM multimedia format. It was developed by Google after purchasing On2 Technologies and released under the terms of BSD license.

WebP was originally released in 2010 with the goal of reducing file size but achieving the same picture quality as JPEG format, hoping to reduce the time it takes to send pictures on the web. Google began enabling WebP to support lossless compression and transparent color (alpha channel) on November 8, 2012, and officially supported it in the reference implementation libwebp 0.2.0 on August 16, 2012. According to Google's earlier tests, WebP's lossless compression is 45% smaller than the PNG files found on the network, and even if these PNG files have been processed with pngcrush and PNGOUT, WebP can still reduce the file size by 28%.

The maximum number of pixels supported by WebP is 16383x16383. Lossy compressed WebP only supports 8-bit 's YUV 4:2:0 format. WebP with lossless compression (reversible compression) supports VP8L coding and ARGB color space of 8-bit. Both lossy and lossless compression support Alpha transparent channel, ICC color configuration, XMP interpretation data.

WebP has both static and dynamic modes. Dynamic WebP (Animated WebP) supports lossy and lossless compression, ICC color configuration, XMP interpretation data, and Alpha transparent channels.

WebP's lossless compression uses advanced techniques, such as dedicated entropy codes for different color channels, using the 2D position of the reverse reference distance and the color cache of the most recently used color. This complements the basic techniques such as dictionary coding, Huffman coding and color index transformation.

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