December 17, 2014 weblog
BPG image format judged awesome versus JPEG
High Efficiency Video Coding is a video compression standard. Gannon Burgett said in Imaging Resource that the technology behind this new format is based on the same HEVC codec used in x265/H.265 video. This allows the BPG file format to handle 14 bits per color channel, lossless compression and even alpha support. "Its strength lies in its ability to produce JPEG quality images at roughly half the size." The BPG site said that "BPG natively supports 8 to 14 bits per channel when most other formats use 8 bits (including most of the JPEG implementations and WEBP). It gives a higher dynamic range (which is important for cameras and new displays) and a slightly better compression ratio (because there are less rounding errors in the decoder)."
So is this the end for JPEG? While "new" is a catchy invitation for breakfast cereals, the same cannot be said for file formats. "If it's not broke, don't fix it" seems to play the loudest. "As with any new file format, the problem is ensuring it catches on with developers, programmers, camera companies and more," said Burgett. Smith similarly wrote that "The new file format, while clearly superior to JPEG, is new…Getting companies to add the feature is a chicken-and-egg problem; no one will be publishing BPG images until there's support, but there's no reason to add support until BPG begins to appear on websites."
Nonetheless, Smith said he hoped hope the file format does receive support in the near future. Its increase in quality is apparent, and its adoption could let photographers share high-quality shots without resorting to formats like PNG and BMP. Paul Monckton, who writes about photography, thinks that BPG is quite impressive: "Bellard's technique delivers a huge leap in compression performance," he wrote in Forbes, and "generates much higher quality images than JPEG for any given size of file." Like other observers, though, Monckton said BPG as a new standard image format would be difficult for reasons of compatibility. With almost no existing software currently supporting the BPG format, he said, it would take a lot for it to gain widespread popularity. Sebastian Anthony wrote in ExtremeTech, "it's very hard to unseat an incumbent file format (or, more accurately, a compression technology). The fact is, despite any misgivings we might have about JPEGs or GIFs, almost every computer system in the world can display them—and generally, in the grand scheme of communication, it's much more important to make sure that your message was seen at all, rather than making sure the message is as small and as optimized as possible."
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