The Digital Negative format lets you convert your proprietary-format raw files (NEF, CR2, etc.) into a format that’s fully publicly documented (more future-proof). Now the standard has been extended to support 32-bit floating point data (capable of representing hundreds of f-stops of dynamic range), plus optional lossy compression (JPEG-like sizes with the flexibility of raw), and more. Check out the DNG 1.4 specification notes on the Lightroom Journal for more info.
One thought on “The DNG format evolves to support HDR, more”
I assume that the specification assume that the pixel alignment was done beforehand.