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Google’s new open source encoder reduces JPEG file size by 35%

March 17, 2017 By Apurva Leave a Comment


Google has introduced a new JPEG encoder called Guetzli. This new encoder is all set to make the world wide web more light as it will shrink JPEG files up to 35%. Guetzli is a JPEG encoder for digital images and web graphics that can enable faster online experiences by producing smaller JPEG files while still maintaining compatibility with existing browsers, image processing applications and the JPEG standard.

The visual quality of JPEG images are directly correlated to its multi-stage compression process: color space transform, discrete cosine transform, and quantization. Guetzli specifically targets the quantization stage in which the more visual quality loss is introduced, the smaller the resulting file. Guetzli strikes a balance between minimal loss and file size by employing a search algorithm that tries to overcome the difference between the psychovisual modeling of JPEG’s format, and Guetzli’s psychovisual model, which approximates color perception and visual masking in a more thorough and detailed way than what is achievable by simpler color transforms and the discrete cosine transform. However, while Guetzli creates smaller image file sizes, the tradeoff is that these search algorithms take significantly longer to create compressed images than currently available methods.

You can grab the source here: https://github.com/google/guetzli?.

source: Google Research Blog

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Filed Under: Featured, Software

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