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.