Eye Adaptation

Eye Adaptation, or automatic exposure, is an effect used to simulate the human eye's adaptation to light exposure. The light sensors in real cameras work in a similar way. It modifies the exposure to adapt the image brightness. For instance, if a human moves from a bright environment into a dark environment, the eyes adjust to the amount of incoming light.

Properties

Property	Description
Mode	The rendering mode used for the exposure processing effect. Possible options: Option Description None Disabled eye adaptation effect. Manual Manual mode uses a fixed exposure value. Automatic Histogram Automatic mode applies the eye adaptation exposure based on the scene color luminance blending using a histogram. Requires compute shader support. Automatic Average Luminance Automatic Average Luminance mode applies the eye adaptation exposure based on the scene color luminance blending using the average luminance.
Speed Up	The speed at which the exposure changes when the scene brightness moves from a dark area to a bright area (brightness goes up).
Speed Down	The speed at which the exposure changes when the scene brightness moves from a bright area to a dark area (brightness goes down).
Pre Exposure	The pre-exposure value applied to the scene color before performing post-processing (such as bloom, lens flares, etc.).
Post Exposure	The post-exposure value applied to the scene color after performing post-processing (such as bloom, lens flares, etc.) but before color grading and tone mapping.
Minimum Brightness	The minimum brightness for the auto exposure which limits the lower brightness the eye can adapt within.
Maximum Brightness	The maximum brightness for the auto exposure which limits the upper brightness the eye can adapt within.
Histogram Low Percent	The lower bound for the luminance histogram of the scene color. This value is in percent and limits the pixels below this brightness. Use values in the range of 60-80. Used only in AutomaticHistogram mode.
Histogram High Percent	The upper bound for the luminance histogram of the scene color. This value is in percent and limits the pixels above this brightness. Use values in the range of 80-95. Used only in AutomaticHistogram mode.