![]() ![]() ![]() Also note that the editor EV100 override setting directly sets the EV100 exposure used in this equation. You can verify this formula's result by disabling the tonemapper through the viewport show flags ( Show > Post Processing), and inspect the scene brightness using the Pixel Inspector. Otherwise, it is 0.ĮV100 = log2(Aperture^2 / Shutter Speed * 100/ISO)Įxposure in the following formula defines the relationship between the scene surface luminance (L, which is measured in cd/m2) and pixel brightness (B) before the tonemapper and exposure compensation are applied. If Apply Physical Camera Exposure is applied, EV100 is calculated as the following formula. If Apply Physical Camera Exposure is disabled in the post process settings, the exposure value will be linear brightness:Įxposure = 1/(2^(EV100 + Exposure Compensation)) The Manual metering mode allows the user to select a single, fixed exposure value that is unaffected by the luminance in the scene. ![]() In photography, this middle gray point is sometimes referred to as "18% gray" or "18% middle gray," referring to the amount of light that is reflected by a gray card. ![]() However, once the average luminance value is determined, both algorithms treat that luminance as middle gray. The Basic and Histogram modes use different algorithms to calculate the average luminance of the scene. Then, the histogram is analyzed to determine the average luminance value. The Auto Exposure Histogram mode first calculates a histogram of the log luminance scene. The Auto Exposure Basic algorithm uses the average of the log luminance of the scene to determine the target exposure value. Manual mode enables the use of Camera settings within the Post Process and Cameras settings to control exposure, rather than using only the settings found in the Exposure category.Īuto Exposure Basic and Auto Exposure Histogram metering modes both calculate the overall luminance of the scene, and brighten or darken the scene to an expected value, but they differ in how they calculate scene luminance. This is the default exposure metering mode in Unreal Engine.Īuto Exposure Basic mode provides fewer settings, but is a faster method that computes single values by downsampling exposure. These different metering modes provide settings that accurately mimic real-world cameras, giving you control over exposure in your scenes through the post process.Īuto Exposure Histogram mode provides finer control over auto exposure with advanced settings constructed from a 64-bin histogram. The engine offers several types of metering modes to choose from when setting up auto exposure in your scenes. ![]()
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