pub unsafe static kCIImageRepresentationHDRImage: &'static CIImageRepresentationOptionAvailable on crate feature
CIContext only.Expand description
An optional key and value to save a HDR image using the gain map channel to a JPEG or HEIF.
The value for this key needs to be a HDR CIImage instance.
When provided, Core Image will calculate a gain map auxiliary image from the ratio of the HDR image to the primary SDR image.
If the the HDR CIImage instance has a /CIImage/contentHeadroom property,
then that will be used when calculating the HDRGainMap image and metadata.
See also Apple’s documentation