DRO/HDR Explained?

Started 3 months ago | Questions thread
tbcass
tbcass Forum Pro • Posts: 42,193
Re: DRO/HDR Explained?

sybersitizen wrote:

Digital Nigel wrote:

No, you're lowering the contrast of the original image, so more of it fits into the low JPEG limits without clipping. It's generally better to achieve the same effect by processing a raw file, so that you can just limit the clipping of highlights and loss of shadows, so you only lose as little contrast as strictly necessary.

You're right to say the process 'squeezes' the dynamic range, but not right to blame 'JPEG limits' for that necessity. Any limits here are in the in-camera RAW-to-JPEG processing intelligence. A JPEG can hold any dynamic range that's given to it after RAW conversion, as you can see when you meticulously (and intelligently) create a photo from a RAW file or a group of bracketed and blended files, then save it as a JPEG.

In addition HDR images are not meant to be used as is because it merely makes sure that the full dynamic range of the scene is within the limits of the JPEG. Once the images are combined then they must be processed to eliminate the flat look. The best way to process the combined images is with tone mapping which restores the look without blowing highlights or reducing the dark areas to invisibility. It is possible to push tone mapping to extremes to produce an artificial look which some like while others do not.

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Tom

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