HDR Settings

As discussed in Illuminance and Auto Exposure Key, the auto exposure key setting controls the amount of scene exposure and determines whether the tone-mapped image appears relatively bright or dark. Several other settings also affect the tone mapping of scene. These are known collectively as HDR (high dynamic range) in the Time of Day Editor.

Film curve parameters in the Time of Day Editor correspond to analogous parameters that exist for camera film. A film curve has three distinct regions with different contrast transfer characteristics:

• The lower part of a film curve that is associated with relatively low exposures is designated the toe, and corresponds to the low-density portions of an image. When an image is exposed so that areas fall within the toe region, little or no contrast is transferred to the image.
• The upper part of a film curve that is associated with relatively high exposures is designated the shoulder, and corresponds to the high-density portions of an image. When an image is exposed so that areas fall within the shoulder region, little or no contrast is transferred to the image.
• The middle part of a film curve with the highest level of contrast is produced within a range of exposures falling between the toe and the shoulder, and is designated the midtones region. This portion of the curve is characterized by a relatively straight and steep slope in comparison to the toe and shoulder regions. You should adjust your image so that important areas fall within this region for maximum contrast.

To set HDR settings parameters

1. In Lumberyard Editor, choose Tools, Other, Time Of Day.

2. Choose HDR Settings, and for HDR, adjust the values of the following settings.

[See the AWS documentation website for more details]

1. Close the Time of Day editor.