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The JPG format is often used in digital camera memory cards. The resultant 'lossy' file means that quality can never be recovered. JPG's are often used for web sites and email as they are generally smaller file sizes as they are lossy meaning that some image quality is lost when the JPG is compressed and saved. WebP lossless compression works by using parts of the image that have already been analysed to construct other parts of the image. Due to the efficiency of the prediction technique many of the blocks contain a zero difference which results in greater compression and thus a smaller file size. The difference between the prediction and reality is then encoded. Each block of pixels are predicted based on other blocks of pixels surrounding it. WebP lossy compression works by a technique of prediction. Google believes that through the adoption of a more efficient image format, the speed of the web as a whole can be increased due to the volume of images being viewed at any one time across the world. Google has made bold claims about the compression efficiency of the format stating that it can be up to 34% smaller than the equivalent JPEG or PNG file. The format allows users to save an image in either lossy or lossless format. WebP is an image format developed by Google in 2010.