Tone Map Node

Tone mapping is a technique used in image processing and computer graphics to map one set of colors to another in order to approximate the appearance of high dynamic range images in a medium that has a more limited dynamic range.

Essentially, tone mapping addresses the problem of strong contrast reduction from the scene values (radiance) to the displayable range, while preserving the image details and color appearance. This is important to appreciate the original scene content.

Inputs

Image: HDR image.

Properties

Type

Rh Simple

Key: The value the average luminance is mapped to.
Offset: Normally always 1, but can be used as an extra control to alter the brightness curve.
Gamma: If not used, set to 1.

R/D Photoreceptor

Intensity: If less than zero, darkens image; otherwise, makes it brighter.
Contrast: Set to 0 to use estimate from input image.
Adaptation: If 0, global; if 1, based on pixel intensity.
Color Correction: If 0, same for all channels; if 1, each independent.

Outputs

Image: LDR image.