这是 杜比官方的 marketing回复 等于没解释 就是描述了大概原理
Here is a quote from Display Daily, quoting Patrick Griffs from Dolby Labs. This is about the best easy English explanation I could find.
"Griffis said that for streaming video, Dolby Vision provides a backward-compatible framework for HDR. There is a base layer of SDR content encoded with a Gamma EOTF and decodable by any streaming video decoder for showing on an SDR display. Then there is an enhancement layer that includes all the necessary data to convert the SDR stream into an HDR stream and metadata that tells the Dolby Vision decoder exactly how to use this enhancement layer data to perform this SDR to HDR conversion. Griffis said the enhancement layer and the metadata adds just 15% on average to the size of the bitstream. This allows streaming companies like Netflix to keep just one version of the file and then stream it to either SDR or HDR customers. An SDR (or HDR10-only) system discards the extra data and shows the SDR image. This saves storage space on the server, at the expense of higher streaming bit rates to SDR customers. Of course, in 2016, the vast majority of streaming customers are SDR customers and this streamed enhancement data is mostly discarded."
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