New submitter more writes with news that Google has added to its WebP image format the ability to losslessly compress images, and to do so with a substantial reduction in file size compared to the PNG format. Quoting: "Our main focus for lossless mode has been in compression density and simplicity in decoding. On average, we get a 45% reduction in size when starting with PNGs found on the web, and a 28% reduction in size compared to PNGs that are re-compressed with pngcrush and pngout. Smaller images on the page mean faster page loads."
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