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JPEG TrueColor 1.2


amir_photoshop

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Hello
I have a few years of use Photoshop software, and I have a question, Adobe Photoshop jpeg format output files to JPEG TrueColor 1.2 storage format, but other formats JPEG TrueColor 1.1 photo editing software to store, what's the difference the format is JPEG TrueColor 1.2 and JPEG TrueColor 1.1 ?
 

revnart

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Found this in the internet:
Shortly thereafter, the group came to the conclusion that the spatial sampling relationship of components specified in JFIF 1.0 was not ideal since it followed digital video conventions rather than those used in common computer formats such as Postscript and QuickTime. They chose to publish another version, JFIF 1.01, which changed that part of the specification to follow the computer format convention. This was deemed to be a minor change since JFIF 1.0 had been circulated for only a short while and decoders which ignored the version number would still render similar images. The Independent JPEG Group (IJG) adopted JFIF version 1.01 for use in its public domain software, which eventually led to millions of images being published in this format. Later in 1992, user feedback led to the final version of JFIF, version 1.02, which supported additional thumbnail formats – most importantly including thumbnails stored in compressed format.

Edit: it's about JFIF, my bad.
 
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