Internet WebPI: the slimming regime Google for JPEG After WebM format for video, Google offers the WebPI an open format for images. Goal, websites that host images lighter, thus reducing the transfer time and page loading. A question became pregnant at the time of the mobile Internet and while the images and photos representing approximately as calculated by Google, 65 % of the weight of a web page. Among the three image formats regarded – gif, png and jpeg – Google engineers have chosen to focus their efforts on the third, the most common. And try to see if there was any way to compress these files further jpeg, without sacrificing their definition. An engine compression video codec used in the VP8 was recovered and added to a container format for inserting metadata if the author of the image is required. Google then tested its compression tool on a sample of one million images on the Internet, most in jpeg format. The second compression has reduced the average weight of these files by 39 %.

A figure that could be even higher, starting from the original uncompressed image. The WebPI also did better than JPEG 2000, when the gain on the same sample was only 9.71 % on average. And more broadly, this WebPI would be comfortable with small images, which is perfectly suited to the web.