Microsoft has taken the beta tag off a plug-in to let Photoshop read and write files in the HD Photo format, which Microsoft is standardising as JPEG XR.
The free plug-in is available for download for Windows and Mac OS X systems. The plug-ins work on Windows XP and Vista, Mac OS X 10.4 and 10.5, and Photoshop CS2 or CS3, Bill Crow, who's overseen the HD Photo and JPEG XR effort, wrote on his blog Thursday.
Microsoft hopes HD Photo eventually will replace the ubiquitous JPEG standard overseen by the Joint Photographic Experts Group. Among the HD Photo advantages that Microsoft touts: it offers more efficient compression, richer colour and a much wider dynamic range; it can optionally store images without data loss from compression; it's free of royalty and licensing constraints; and it can run in camera hardware. Support for the file format, initially called Windows Media Photo, is built into Windows Vista.
The left image shows how JPEG, with its narrow dynamic range, sometimes loses data when edited to correct for overexposure. The right HD Photo image, encoded with Microsoft's scRGB color technology that's built into the file format, has more range, so highlights can be recovered better. (Credit: Microsoft/Bill Crow)
HD Photo also can be used to show images online at different resolutions, transmitting only the portion of the image that's shown on the screen. That's useful for zooming in to a high-resolution photo without having to download a vast image, a technology Microsoft uses in its HD View software for viewing detailed images online. One organisation using HD View is Xrez.
However, Microsoft faces significant challenges in encouraging adoption of the technology. Building it into Vista is a big step, and an endorsement from Photoshop publisher Adobe Systems helps, but JPEG is deeply entrenched. Standardisation through JPEG could encourage industry players to adopt the standard -- in particular those who are leery of Microsoft's power.
But there are plenty of standards that never catch on. What could really tip the balance in favour of HD Photo/JPEG XR is if it gets built into cameras directly so photographers can start using it from the outset.
The final version of the plug-in, developed in part by Pegasus Imaging Systems, looks mostly like recent betas, Crow said.
"All the changes we've made since the last beta are under the covers, fixing a couple minor bugs, addressing several theoretical security vulnerabilities and generally bringing the code up to current Microsoft standards for released software," he said. "Don't forget that the beta versions will expire on December 31st, so you should definitely download and install these new released versions."