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This page provides information about the Color Correct utility texture in V-Ray for Blender. 

 

Overview

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The V-Ray Color Correct

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Texture works with the Red, Green and Blue channels of a texture map and allows them to be remapped to different colors.

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 Image Added

 

UI Path

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||Node Editor|| > Add > Utility Textures > Color Correct

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Texture Map – The texture being color corrected.

Hsl Hue Gain – Controls the hue gain. Offset value is added to the Hue channel, not multiplied.

Hsl Saturation – Offset value is added to the Saturation channel.

Hsl Lightness Offset – The Saturation Channel is multiplied by the value.

Hsl Lightness Gain – The Lightness Channel is multiplied by the value.

Hsv Hue Gain – Controls the hue gain. Offset value is added to the Hue channel, not multiplied.

Hsv Saturation Offset – Offset value is added to the Saturation channel.

Hsv Saturation Gain – Saturation Channel is multiplied by the Gain.

Hsv Value Offset – Offset value is added to the channel.

Hsv Value Gain – Value Channel is multiplied by the Gain.

Red, Green, Blue Offset & Gain – For each channel there are two parameters Offset and Gain. Offset value is added to the channel while the gain is multiplied.

 

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Parameters

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Alpha, Blue, Green and Red channel selectors – These 4 drop-downs remap different values in each channel. Select from channel values at different stages of the Color Correct pipeline.

Red, Green, Blue, Alpha: these are the resulting channel values of all previous operations.

Intensity: Average of the Red, Green and Blue channels.

In Red, In Green, In Blue, In Alpha: These are the unprocessed input channel values.

In Intensity: Average of the In Red, In Green and In Blue channels.

HSL Hue, HSL Saturation, HSL Lightness: These are the HSL stage's result values.

HSV Hue, HSV Saturation, HSV Value: These are the HSV stage's result values.

Hsl Hue Offset – Offset value is added to the Hue channel.

Hsl On – Enables the Hue, Saturation, and Luminance controls.

Hsv Hue Offset – Offset value is added to the Hue channel.

HSV On – Enables the Hue, Saturation, and Value controls.

Post Clamp – Enables the clamp. RGBA channels are clamped by the specified min and max values.

Post Clamp Max/ Post Clamp Min – Controls Clamp. The normal range of the parameters is [0..1] values out of this range can be used to clamp HDRI images. Affects alpha.

Post Clamp Normalize – Clamps colors are scaled so that they map to [0..1] range again after the clamp operation. Affects alpha.

Post Invert – RGB channels are inverted around 50% resulting negative of the input image.

Post Mono – R, G and B channels are set to average of those 3 channels, gives a gray-scale image.

Post Process On – Enables the Post Process parameters.

Pre Brightness – An amount added to all RGBA channels. Affects alpha.

Pre Clamp – RGBA channels are clamped by the specified Pre Clamp Min/Max values. The normal range of the parameters is [0..1] but it can still specify values out of this range to clamp HDRI images. Affects alpha.

Pre Clamp Max/ Pre Clamp Min – Controls the Pre Clamp parameter.

Pre Clamp Normalize – Available only when the Pre Clamp parameter is enabled. Clamp colors are scaled so that they map to [0..1] range again after the clamp operation. Affects alpha.

Pre Contrast – Scales the RGBA channel values around 50% intensity. 0% contrast will produce 50% gray regardless the input color. Affects alpha.

Pre Gamma – Modifies the RGBA channel values exponentially. Gamma is a non-linear operation which does not change black (0%) and white (100%) while changing the other values. Higher gamma values produce darker mid-tones while lower gamma values produce brighter mid-tones. Affects alpha.

Pre Invert – Converts the input image from RGBA to CMYK by adding 50% of the contrast of the source.

Pre Mono –  When enabled, produces a gray-scale image.

Pre Unmult Alpha – If the source texture has alpha channel, RGB channel values are normally multiplied with the alpha channel value. For example if a white pixel has 50% alpha, it's stored as %50 gray. This provides faster compositing operations since RGB values are already multiplied with alpha.

Premultiply New Alpha – Multiply RGB channels with the resulting alpha value.

Pre-process On – Turn on/off all of the RGB space pre-processing operations.

RGBA Channel Mapping On – Turns on the RGBA channel mapping.

Source Color – The texture being color corrected.

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