Images in webp format are 26% smaller compared to PNGs and also are 25-34% smaller than respective equivalent JPEG images. It is loss compression process uses the same methodology as VP8 (created by On2 technologies, which is a royalty-free video compression format) for estimating (video) frames. VP8 is based on block prediction & like any block-based codec. VP8 divides the frame into smaller segments called macroblocks. These macroblocks share the following 4 common intra-prediction modes : The image frame is “key” in the sense that it only uses the pixels already decoded in the immediate spatial neighborhood of each of the macroblocks & tries to recover the unknown parts and uniquely identify the macroblock.Within each macroblock, the encoder ( a process to convert data from one format to another, in this case, one image format like jpeg/png to webp) can predict redundant motion & color information based on previously processed macroblocks.You don’t have to remember every technical jargon associated with this technology. H_PRED (horizontal prediction): It fills every column with the macroblock with the generated copy of the left column of the same denoted by L.V_PRED (vertical prediction): It fills every row with the macroblock with the generated copy of the above row denoted by A.DC_PRED (DC prediction): It fills the macroblock with a single value based on the avg of the pixels in the row above A (V_PRED) & the column to the left of L (H_PRED).TM_PRED (TrueMotion prediction): It uses pixel P above & to the left of the block.Horizontal differences b/w pixels in A (starting from P) are generated using the pixels from L to start each row. Google Chrome and all Chromium-based browsers.Versions of Microsoft Edge based on EdgeHTML support WebP via a platform extension that is installed by default.Safari also has added support for WebP format files and images with iOS 14 and macOS Big Sur.Note: WebP can also be displayed in all major browsers using the WebPJS JavaScript library, although support in Internet Explorer 6 and above is achieved using Flash.
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WebP: Getting started Download the pre-compiled packages for different OS (s) :Īll the WebP packages are available in Google’s official downloads repository. Precompiled WebP utilities and library for download are also available : LinuxĬwebP compresses the image using WebP format. User can convert a PNG image file to a WebP image format with the quality range of 0 to 100 with the following command : cwebp -q 80 image.png -o image.webp Converting Images to the WebP Format using cwebp tool: Note: Animated PNGs and WebP files are not supported.
In the above command, the quality compression factor is 80. Using cwebp to compress a 2.1 MiB jpg image to 983 Kib webp image (52% lossless compression) In the below example, using cwebp command without using -q option, so by default, it is 75.
To explicitly specify the name of the output webp file. If this option is omitted, cwebp will perform compression but will only report the statistics using “-” as the name of the output file/image name. This option is useful only if the input image/filename starts with an ‘-‘. To specify the compression factor for RGB channels between 0 & 100.
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