Equalize Copernicus node

Equalizes colors by stretching or shifting their range.

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Parameters
Inputs
Outputs

This node adjusts colors by shifting or scaling them. You can use this node to re-anchor the colors or make them fit a given range.

This node is useful when you need to fit an unknown input range into a specific range.

Note

Changes to the input can cause unwanted effects in procedural setups if some frames suddenly have extreme values. This means it’s usually better to use a Remap COP with a fixed range. The Remap COP is also faster because it doesn’t do the range computation.

Parameters ¶

Signature

The layer type that the source accepts.

See Signatures for more information.

Mask

The amount of the new value to mix in with the original value. Higher values mix in more of the new value. Lower values mix in less of the new value. You can also set the RGBA channels to which you apply the effects of this node.

The default value is 1, which means this node uses only the new value. See Mask for more information.

Toggle RGB

Turns the Red, Green, and Blue channels on and off.

Red (default)

Applies this node’s effects to the Red channel.

Green (default)

Applies this node’s effects to the Green channel.

Blue (default)

Applies this node’s effects to the Blue channel.

Alpha (default)

Applies this node’s effects to the Alpha channel.

Equalize By

The method used to equalize the colors.

Stretch to Black and White

Map the minimum and maximum values found in the image to the Black and White values.

Move Minimum to Black

Adjust the colors so the minimum value is the Black value.

Move Maximum to White

Adjust the colors so the maximum value is the White value.

Move Average to Value

Adjust the colors so the average luminance matches the given Target Average.

Scale to Maximum Length

Scale the colors so the maximum luminance matches the given White value.

Fit Method

The method used to move a certain color to a goal value.

Note

This parameter doesn’t apply when Equalize By is set to Stretch to Black and White or Scale to Maximum Length.

Shifting Values

Match the goal value by adding the difference to all pixels.

Scaling Values

Match the goal value by scaling all pixels by the ratio.

Luminance Type

The luminance type to apply to the colors.

SGI Luminance

This is a historical luminance computation used in Houdini, which is believed to originate with SGI.

lum = 0.3086 * red + 0.6094 * green + 0.0820 * blue

NTSC Luminance

The standard NTSC luminance computation, which is a common luminance option.

lum = 0.299 * red + 0.587 * green + 0.114 * blue

HDTV Luminance

The HDTV standard luminance from BT 709.

lum = 0.2126 * red + 0.7152 * green + 0.0722 * blue

Average

An average of the channels.

Maximum Channel

The maximum of the channels.

Minimum Channel

The minimum of the channels.

Magnitude / Length

The length of the vector formed by taking the channels as components. For a mono input, this is the absolute value.

Hue

Convert to HSV and return the hue channel.

Saturation

Convert to HSV and return the saturation channel.

Value

Convert to HSV and return the value channel.

Red

Extract the red, or x, channel.

Green

Extract the green, or y, channel.

Blue

Extract the blue, or z, channel.

Alpha

Extract the alpha, or w, channel.

Black

The value to use for black, which is usually 0.

White

The value to use for white, which is usually 1.

Target Average

When Equalize By is Move Average to Value, this is the goal average value.

Inputs ¶

source

The layer to equalize.

active

An optional layer of pixels that contribute to computing the range of the equalization. Pixels with a value greater than 0.5 are considered.

mask

An optional per-pixel mask amount that’s scaled by the Mask parameter.

Outputs ¶

equalize

The equalized layer.

See also

Remap

Copernicus nodes

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End of a block, declaring its outputs.
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Extracts a channel from a layer.
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Combines multiple Mono layers into one multichannel layer.
Channel Split

Divides a layer’s channels into Mono layers.
Channel Swap

Swaps channels within a multichannel layer.
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Adds chromatic aberration to your image.
Clamp

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Cross Product

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Cryptomatte Encode

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Edge Detect by Depth

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Edge Detect by Normal

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Eikonal

Computes distances by solving the Eikonal equation.
Equalize

Equalizes colors by stretching or shifting their range.
Error

Generates a message, warning, or error.
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Feather

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File

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Fractal Noise 3D

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Glow

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HSV Adjust

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Height to Normal

Converts a height layer to a normal layer.
Hex Tile

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Histogram

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ID to Mask

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ID to Mono

Converts an ID layer into a mono layer.
ID to RGB

Converts an ID layer into an RGB layer.
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Kuwahara Filter

Applies the Kuwahara filter, which creates painterly effects.
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Generates a layer.
Layer Attribute Create

Adds or edits user-defined metadata on a layer.
Layer Properties

Edits basic layer metadata.
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Converts a layer into a 2D volume.
Light

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Match Camera

Transforms a layer to match a reference camera.
Median

Applies a median filter to an image.
Mirror

Mirrors an image based on an arbitrary number of planes.
Mono

Converts a layer to mono.
Mono to ID

Converts a mono layer into an ID layer.
Mono to RGB

Converts a mono layer into an RGB layer.
Mono to RGBA

Converts a mono layer into an RGBA layer.
Mono to SDF

Computes a signed distance field from an iso-level of a mono layer.
Null

Passes inputs to the outputs.
OCIO Transform

Converts color spaces using OCIO transforms.
ONNX Inference

Applies inference from an ONNX Machine Learning model.
OpenCL

Executes an OpenCL kernel on layers.
Output

Collects the outputs of a subnetwork.
Polar to UV

Converts polar coordinate pixels to Cartesian pixels.
Position Map

Generates a Position Map.
Prefix Sum

Computes the prefix sum of a layer.
Premultiply

Premultiplies an RGBA layer.
Preview Material

Applies the preview material to geometry.
Project on Layer

Projects a layer onto a target layer.
Quantize

Quantizes input data into discrete steps.
RGB to RGBA

Converts RBG layers to RGBA.
RGB to UV

Splits an RGB layer into UV and Mono layers.
RGBA to RGB

Converts RBGBA layers to RGB.
RGBA to UV

Splits an RGBA layer into two UV layers.
ROP Image

Writes the output of a COP network to disk.
Ramp

Generates linear and radial ramps.
Random Mono

Creates a Mono layer with random values.
Random RGB

Creates a Mono layer with random values.
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Rasterizes geometry onto a layer.
Rasterize Layer

Rasterizes a layer onto another layer’s camera.
Rasterize Setup

Prepares geometry for the Rasterize Geometry COP.
Remap

Remaps a layer.
Resample

Performs image scaling by changing the width, height and pixel sizes.
SDF Adjust

Modifies the values for a Mono SDF layer.
SDF Blend

Combines two Mono SDF layers.
SDF Shape

Builds a 2D signed distance field of a selected shape.
SDF to Mono

Converts an SDF field to a Mono image layer.
SDF to RGB

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Imports SOP Geometry into Copernicus.
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Segment by Value

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Slap Comp Import

Import live layers from the Solaris Viewport.
Slope Direction

Converts a height layer into a direction layer.
Smooth Fill

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Stamp Points

Stamps layers from point positions.
Statistics

Outputs the average, minimum and maximum values of the input layer
Statistics by ID

Compute statistics for each ID island.
Streak Blur

Streaks an image, adding a motion blur effect.
Subnetwork

Used to organize a collection of COPs into one node.
Switch

Selects an input layer.
Switch If Wired

Selects an input based on what is connected.
Switch by Type

Selects an output layer by the type of the inputs.
Tile Pattern

Generates rectangular tiles for texture patterns.
Transform 2D

Transforms a layer in 2D.
Transform 3D

Transforms a layer in 3D.
UV Map

Generates a UV Map.
UV Map by ID

Creates a UV Map for each connected ID island.
UV Sample

Samples an input layer using a UV layer.
UV Transform

Transforms the values of a UV layer in 2d space.
UV to Polar

Converts Cartesian coordinate pixels to polar coordinate pixels.
UV to RGB

Joins an UV and Mono layer into an RGB layer.
UV to RGBA

Joins two UV layers into an RGBA layer.
Vector Transform

Transforms values of an RGB layer in 3d space.
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Performs a wipe transition between two images.
Worley Noise

Generates Worley noise.
Worley Noise 3D

Generates Worley noise from 3d locations.
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