JPEG XT
From Just Solve the File Format Problem
JPEG XT is a backward-compatible extension of the JPEG graphics format. It offers higher bit depths, high dynamic range, lossless and near-lossless compression, and transparency.
JPEG XT is similar in concept to JPEG-HDR. Its precise relationship to JPEG-HDR is not clear; the formats appear to be mutually incompatible.
As of 2016-01 it is still in development, though some parts of the standard have been published.
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Format details
Like JPEG-HDR, it uses APP11 segments. Unlike JPEG-HDR, the data in those segments apparently uses boxes/atoms format, with the brand "jpxt".
Specifications
The documents listed here are not necessarily available yet, and if they are, they're probably not free to download.
- ISO/IEC 18477-1:2015 - Part 1: Scalable compression and coding of continuous-tone still images
- ISO/IEC PRF 18477-2 - Part 2: Extensions for high dynamic range images
- ISO/IEC 18477-3:2015 - Part 3: Box file format
- ISO/IEC CD 18477-4 - Part 4: Conformance testing
- ISO/IEC CD 18477-5 - Part 5: Reference software
- ISO/IEC FDIS 18477-6 - Part 6: IDR Integer Coding
- ISO/IEC FDIS 18477-7 - Part 7: HDR Floating-Point Coding
- ISO/IEC DIS 18477-8 - Part 8: Lossless and Near-lossless Coding
- ISO/IEC DIS 18477-9 - Part 9: Alpha Channel Coding
