![]() ![]() In a camera’s native RGB space, these may or may not be negative, depending on the encoding primaries used. The mapping to colorimetry will thus have residual errors and can create one or more negative channels. Camera images are captured through color filter arrays that have spectral curves different from the color-matching functions. This means roughly half of all “black” noise will make pixel values with negative components.Īnother cause is simple colorimetric error in the camera mapping of tristimulus inputs. It is common for camera manufacturers to set the mean of their camera noise floor to map to zero. There are two main contributors that can cause cameras to produce negative ACES values from an IDT: Seeing negatives can be unnerving, but they are actually quite common to see in floating point image formats and IDTs from most camera manufacturers will result in some negative values even with “normal” images. Negative values can occur in ACES files (and other floating point formats where they are allowed).
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