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Luminance is a utility node that takes in a color, and outputs a luminance value.
Luminance simply means the apparent brightness of a color, as seen by the human eye. The human eye is not equally sensitive across the whole spectrum; greens appear brighter than reds, and reds brighter than blue. For this reason, luminance is calculated by this equation:Luminance = 0.3 * red + 0.59 * green + 0.11 * blueYou can use the Luminance node to convert a color image or texture into a monochrome (black-and-white) image. To do this, connect the texture's Out Color into the Luminance node's Value attribute, then connect the Luminance node's Out Value attribute to all three color channels (R, G, and B) of a shader. In the table below, imporant attributes have their names listed in bold in the description column.
This node is MP safe
Node name | Parents | Classification | MFn type | Compatible function sets |
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luminance | dependNode | utility/color | kLuminance | kBase kNamedObject kDependencyNode kLuminance |
blendColors, clamp, lightInfo, gammaCorrect, surfaceLuminance, contrast, rgbToHsv, hsvToRgb, samplerInfo, setRange, resolution, renderQuality, renderGlobals, renderGlobalsList, baseShadingSwitch, singleShadingSwitch, doubleShadingSwitch, tripleShadingSwitch
outValue, renderPassMode, value, valueB, valueG, valueR
Long name (short name) | Type | Default | Flags | ||||||||||||||
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value
(v ) |
float3 | 0.0, 0.0, 0.0 | |||||||||||||||
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renderPassMode
(arp ) |
enum | 1 | |||||||||||||||
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outValue
(o ) |
float | 0.0 | |||||||||||||||
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