[Warner306]

HDR content has already been graded with very different color for some scenes or all scenes, while other movies are very close to the SDR Blu-ray. The SDR version is not always a good comparison because a colorist touches each source independently, so there has to be some color differences. Also, when working with an SDR grade, the source is usually scanned or converted by a LUT into SDR, as where an HDR source can be graded from the original film stock, Log or RAW output from the camera with an extended dynamic range. This often leads to a very different look to the SDR version in most cases.

The tone mapping probably needs some saturation correction. Reinhard is meant to address luminance. Chrominance is also supposed to be compressed to correct any oversaturation or undersaturation caused by luminance compression.