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This page provides details on the settings found in the Color Mapping rollout, which is used when setting up renders.

Overview

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Color mapping (sometimes also called tone mapping) dictates which color operations are performed between the user interface inputs and the values rendered and the way the rendered pixels are displayed through the VFB on the user monitor. 

V-Ray default Color Mapping settings ensure a 1:1 mapping of all the user operations and the final result. For example, doubling a light's intensity exactly doubles its contribution to the final pixel, and cutting a shader's light reflectance in half cuts its contribution to the final pixel in half. This approach corresponds to Linear Workflow.

Changing the Color Mapping settings might be desirable for artistic purposes, but doing so will deviate from the linear correspondence between user actions and the rendered result, and will also veer away from physical accuracy in the scene.

To ensure the most accurate results, it's best to leave the Color Mapping settings at their default values and perform artistic color transformations during post-production. This will also ensure repeatability, consistency, and a very accurate rendered solution.

 

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UI Path: ||Render Setup window|| > V-Ray tab > Color mapping rollout

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Default Parameters

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The following parameters are visible from the Color Mapping rollout when set to the Default Render UI Mode.

Type – Sets the type of color transformation. For more information, please see the Color Mapping Types example below.

Linear multiply – Simply multiplies the final image colors based on their brightness without applying any changes. The default selection.
Exponential – Saturates the colors based on their brightness. This can be useful in preventing burnouts in very bright areas (for example, around light sources). This mode clamps colors so that no value exceeds 255, or 1 in floating point values. 
HSV exponential – Similar to Exponential, but preserves the color hue and saturation instead of washing out the color towards white. 
Intensity exponential – Similar to Exponential, but preserves the ratio of the RGB color components and only affects the intensity of the colors. 
Gamma correction – This option is deprecated. Applies a gamma curve to the colors. 
Intensity gamma – This option is deprecated. Applies a gamma curve to the intensity of the colors instead of each channel (RGB) independently. 
Reinhard – A blend between Exponential and Linear multiply. The degree to which one method or the other is applied to the image is specified by the Burn value parameter.  

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The default settings for color mapping mean that V-Ray renders out the image in linear space (Reinhard color mapping with Burn value 1.0 produces a linear result).

Multiplier – A general multiplier for the colors before they are corrected when Type is set to Gamma correction, Intensity gamma, or Reinhard.

Burn value – Available when Type is set to Reinhard. If this value is 1.0, the result is the same as setting Type to Linear multiply. If this value is 0.0, the result is the same as Exponential. Values between 0.0 and 1.0 blend the two types.

Dark multiplier – Specifies the multiplier applied to dark colors when Type is set to Linear multiply, Exponential, HSV exponential, or Intensity exponential. The default value is 1.0.

Bright multiplier – Specifies the multiplier applied to bright colors when Type is set to Linear multiply, Exponential, HSV exponential, or Intensity exponential. The default value is 1.0.

Inverse gamma – The inverse of the gamma value when Type is set to Gamma correction or Intensity gamma. For example, for a gamma value of 2.2, this value is 1/2.2, or 0.4545.

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