for Windows is a codec built with the libwebp library
. It implements the interface defined by the Windows Imaging Component (WIC) to provide WebP support for latest versions of Windows operating systems.
This codec allows applications using WIC to access WebP files. On Windows Vista and Windows 7, this includes the possibility of viewing WebP files in Windows Photo Viewer and their thumbnails in Windows Explorer.
Currently, the WebP codec only includes the decoder. It will support both encoding and decoding in a future release. It will also add metadata support.
What is WebP
WebP is a new image format that provides lossless and lossy compression for images on the web. WebP consists of a codec based on VP8, that Google open-sourced in May 2010 and a container based on RIFF.
WebP lossless images are 28% smaller in size compared to PNGs.
WebP lossy images are 25-34% smaller in size compared to JPEG images at equivalent SSIM index. WebP supports lossless transparency (also known as alpha channel) with just 22% additional bytes.
The Windows Imaging Component provides a consistent API for image processing so applications that support the WIC get support for image formats such as WebP when the codec is installed.