@orillusion/core

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Class: ColorGradingUtil

Defined in: src/util/ColorGradingUtil.ts:13

CPU mirror of ColorGradingShader, plus helpers to author strip LUTs.

LUT layout (the common "256×16" strip, generalized): size slices side by side, each size×size. Inside a slice x = red, y = green (top row is green 0); the slice index is blue. Values are sRGB-encoded 8-bit.

Constructors

Constructor

new ColorGradingUtil(): ColorGradingUtil

Returns

ColorGradingUtil

Methods

neutral()

static neutral(): ColorGradingSetting

Defined in: src/util/ColorGradingUtil.ts:15

Settings that leave the image untouched.

Returns

ColorGradingSetting

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whiteBalance()

static whiteBalance(temperature, tint): RGB

Defined in: src/util/ColorGradingUtil.ts:20

Per-channel multipliers for a temperature / tint pair.

Parameters

temperature

number

tint

number

Returns

RGB

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apply()

static apply(rgb, s): RGB

Defined in: src/util/ColorGradingUtil.ts:25

Apply the parametric grade (everything except the LUT) to a linear display-referred color.

Parameters

rgb

RGB

s

ColorGradingSetting

Returns

RGB

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createLUTData()

static createLUTData(size?, fn?): object

Defined in: src/util/ColorGradingUtil.ts:44

Build the RGBA8 pixels of a strip LUT from a function on sRGB-encoded colors in [0,1]. fn defaults to identity (a neutral LUT).

Parameters

size?

number = 16

fn?

(r, g, b) => RGB

Returns

object

{ data, width: size*size, height: size }

data

data: Uint8Array

width

width: number

height

height: number

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sampleLUT()

static sampleLUT(lut, srgb): RGB

Defined in: src/util/ColorGradingUtil.ts:63

Trilinear lookup into strip-LUT pixels, sRGB-encoded in and out. Mirrors the shader.

Parameters

lut

data

Uint8Array

width

number

height

number

srgb

RGB

Returns

RGB

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applyWithLUT()

static applyWithLUT(rgb, s, lut): RGB

Defined in: src/util/ColorGradingUtil.ts:78

Full CPU pipeline: parametric grade, then the LUT blended by lutIntensity. Linear in, linear out.

Parameters

rgb

RGB

s

ColorGradingSetting

lut

data

Uint8Array

width

number

height

number

Returns

RGB