Although one could say that JPEG files are the standard in mobile photography, are not those that offer the best image quality. In fact, much of their popularity comes from the fact that they support much higher compression than the lossless PNG extension, even at the cost of generating artifacts that make copies worse.
Google is going part way and still has the issue of pending copy issues, but it’s already on the table a new compression format that takes 35% less space– the new open source Jpegli.
This is what Jpegli offers
Oddly enough, the idea behind Jpegli comes from web optimization. Therefore, to reduce page loading times, integrated images must be compressed to speed up their display, without pixelating or reducing their quality.
The result is that Jpegli aims to have the best compression rate for high quality images on the market and, unlike the problematic WebP, is fully compatible with existing JPEG encoders and decoders. Without going any further, the issue of compatibility is what has wreaked havoc on the HEIC format when it comes to development.
Jpegli works with most used 8-bit format and it also supports more than 10 bits, which means it will minimize artifacts and other issues generated in JPEG.
In a blog post, Google delved into the technical details of how Jpegli works, based on tools developed for its most advanced JPEG XL format, but the bottom line is that it relies on new techniques that reduce more effectively the noise and at the same time they are able to store more details in smaller files
All of the above has a result: Images take up 35% less space without losing compatibility. Users can benefit from the consequence, both by saving space on the device and saving data during file transfers or simply opening websites that embed them.
Under these lines, some graphics on how it works, where a higher ELO score means better performance. So, jpegli with 2.8 BPP gets a higher ELO rating than libjpeg-turbo with 3.7 BPP, with 32% higher bitrate than Jpegli.
If you want to dig deeper into this new open source tool, Google has uploaded it to GitHub. For now Google has given no explanation as to where it will use this new extensionbut it wouldn’t be unusual for Jpegli to access more of the company’s products, like Google Photos, which would mean a notable relief of space on its servers without loss of quality.
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