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How to port UE4 ACES to URP

jplee 2023. 9. 1. 00:11

 

이 과정에 사용된 Unity 버전은 2021.1.18로, URP 버전 11을 기반으로 작성되었습니다.

다만 아래의 내용을 참조 하여 거의 모든 URP 버전에 통합 할 수 있을 것입니다.

 

UE4에서 사용되는 ACES 톤 매핑을 유니티 엔진 URP로 포팅하려고 합니다.
이 과정을 통해 향후 다양한 톤 매핑 로직을 유연하게 추가할 수 있습니다.

 

위와 동일한 형식으로 추가합니다.

 

Adding tone mapping mode.

Tonemapping.cs

public enum TonemappingMode
    {
        None,
        Neutral, // Neutral tonemapper
        ACES,    // ACES Filmic reference tonemapper (custom approximation)
        Custom,
        /////////////////UE4_ACES_BEGIN///////////////
        UE4_ACES,
       /////////////////UE4_ACES_END/////////////////
    }

UE4 ACES를 추가했습니다.

One more mode has been added.

이제 몇 가지 옵션을 추가해 봅시다.

톤 매핑 클래스에 변수를 추가하겠습니다.

 

Tonemapping.cs

public sealed class Tonemapping : VolumeComponent, IPostProcessComponent
    {
        [Tooltip("Select a tonemapping algorithm to use for the color grading process.")]
        public TonemappingModeParameter mode = new TonemappingModeParameter(TonemappingMode.None);
        
        /////////////////UE4_ACES_BEGIN/////////////////
        //create floatParameter
        /// This is only used when <see cref="Tonemapper.UE4_ACES"/> is active.
        [Tooltip("Film_Slope")]
        public ClampedFloatParameter slope = new ClampedFloatParameter(0.88f, 0f, 1f);
        /// This is only used when <see cref="Tonemapper.UE4_ACES"/> is active.
        [Tooltip("Film_Toe")]
        public ClampedFloatParameter toe = new ClampedFloatParameter(0.55f, 0.0f, 1.0f);
        /// This is only used when <see cref="Tonemapper.UE4_ACES"/> is active.
        [Tooltip("Film_Shoulder")]
        public ClampedFloatParameter shoulder = new ClampedFloatParameter(0.26f, 0.0f, 1.0f);
        /// This is only used when <see cref="Tonemapper.UE4_ACES"/> is active.
        [Tooltip("Film_BlackClip")]
        public ClampedFloatParameter blackClip = new ClampedFloatParameter(0.0f, 0.0f, 1.0f);
        /// This is only used when <see cref="Tonemapper.UE4_ACES"/> is active.
        [Tooltip("Film_WhiteClip")]
        public ClampedFloatParameter whiteClip = new ClampedFloatParameter(0.04f, 0.0f, 1.0f);
        /////////////////UE4_ACES_END/////////////////        

        public bool IsActive() => mode.value != TonemappingMode.None;

        public bool IsTileCompatible() => true;
    }

이제 추가된 변수에서 얻은 값을 편집기에 전달해야 합니다.

먼저 에디터에 SerializedDataParameter 5개를 추가해 보겠습니다.

 

TonemappingEditor.cs

/////////////////UE4_ACES_BEGIN/////////////////
SerializedDataParameter m_Slope;
SerializedDataParameter m_Toe;
SerializedDataParameter m_Shoulder;
SerializedDataParameter m_BlackClip;
SerializedDataParameter m_WhiteClip;
/////////////////UE4_ACES_END/////////////////

TonemappingEditor.cs

public override void OnEnable()
{
    var o = new PropertyFetcher<Tonemapping>(serializedObject);

    m_Mode = Unpack(o.Find(x => x.mode));
    /////////////////UE4_ACES_BEGIN/////////////////
    m_Slope = Unpack(o.Find(x => x.slope));
    m_Toe = Unpack(o.Find(x => x.toe));
    m_Shoulder = Unpack(o.Find(x => x.shoulder));
    m_BlackClip = Unpack(o.Find(x => x.blackClip));
    m_WhiteClip = Unpack(o.Find(x => x.whiteClip));
    /////////////////UE4_ACES_END///////////////////

}

재설정 버튼 UI 추가

TonemappingEditor.cs

OnInspectorGUI() 함수에서 GUILayout.Button() API를 사용하여 재설정 버튼을 추가합니다.

Unity - Scripting API: GUILayout (unity3d.com)

 

Unity - Scripting API: GUILayout

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docs.unity3d.com

public override void OnInspectorGUI()
{
    PropertyField(m_Mode);
    /////////////////UE4_ACES_BEGIN/////////////////
    if ( m_Mode.value.intValue == (int)TonemappingMode.UE4_ACES)
    {
        UnityEngine.GUILayout.BeginVertical("box");
        UnityEngine.GUILayout.BeginHorizontal();

        PropertyField(m_Slope);
        if (UnityEngine.GUILayout.Button("Reset"))
        {
            m_Slope.value.floatValue = 0.88f;
        }
        UnityEngine.GUILayout.EndHorizontal();

        UnityEngine.GUILayout.BeginHorizontal();
        PropertyField(m_Toe);
        if (UnityEngine.GUILayout.Button("Reset"))
        {
            m_Toe.value.floatValue = 0.55f;
        }
        UnityEngine.GUILayout.EndHorizontal();

        UnityEngine.GUILayout.BeginHorizontal();
        PropertyField(m_Shoulder);
        if (UnityEngine.GUILayout.Button("Reset"))
        {
            m_Shoulder.value.floatValue = 0.26f;
        }
        UnityEngine.GUILayout.EndHorizontal();

        UnityEngine.GUILayout.BeginHorizontal();
        PropertyField(m_BlackClip);
        if (UnityEngine.GUILayout.Button("Reset"))
        {
            m_BlackClip.value.floatValue = 0.0f;
        }
        UnityEngine.GUILayout.EndHorizontal();

        UnityEngine.GUILayout.BeginHorizontal();
        PropertyField(m_WhiteClip);
        if (UnityEngine.GUILayout.Button("Reset"))
        {
            m_WhiteClip.value.floatValue = 0.04f;
        }
        UnityEngine.GUILayout.EndHorizontal();
        UnityEngine.GUILayout.EndVertical();

    }
    /////////////////UE4_ACES_END////////////////////

    // Display a warning if the user is trying to use a tonemap while rendering in LDR
    var asset = UniversalRenderPipeline.asset;
    if (asset != null && !asset.supportsHDR)
    {
        EditorGUILayout.HelpBox("Tonemapping should only be used when working in HDR.", MessageType.Warning);
        return;
    }
}

Using 을 사용하여 UnityEngine 네임스페이스를 임포트할 수도 있습니다.

재설정 버튼을 클릭하면 직렬화된 각 프로퍼티가 기본값인 초기값으로 다시 가져옵니다. 

좋습니다. 기능은 작동하지 않지만 UI는 의도한 대로 잘 갖춰져 있습니다.  

 

Properties and shader integration.

UE4 엔진의 ACES 구조를 참조하여 작성한 셰이더 코드를 추가해 보겠습니다.

Packages/com.unity.render-pipelines.universal@11.0.0/ShaderLibrary/UE4_ACES.hlsl

UE4_ACES.hlsl 형식으로 위 경로에 추가합니다.

#ifndef UNITY_UE4ACES_INCLUDED
#define UNITY_UE4ACES_INCLUDED

#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/ACES.hlsl"

float FilmSlope;// = 0.91;
float FilmToe;// = 0.53;
float FilmShoulder;// = 0.23;
float FilmBlackClip;// = 0;
float FilmWhiteClip;// = 0.035;

float3 UE4ACES(float3 aces)
{
	// "Glow" module constants
	const float RRT_GLOW_GAIN = 0.05;
	const float RRT_GLOW_MID = 0.08;

	float saturation = rgb_2_saturation(aces);
	float ycIn = rgb_2_yc(aces);
	float s = sigmoid_shaper((saturation - 0.4) / 0.2);
	float addedGlow = 1.0 + glow_fwd(ycIn, RRT_GLOW_GAIN * s, RRT_GLOW_MID);
	aces *= addedGlow;

	const float RRT_RED_SCALE = 0.82;
	const float RRT_RED_PIVOT = 0.03;
	const float RRT_RED_HUE = 0.0;
	const float RRT_RED_WIDTH = 135.0;

	// --- Red modifier --- //
	float hue = rgb_2_hue(aces);
	float centeredHue = center_hue(hue, RRT_RED_HUE);
	float hueWeight;
	{
		hueWeight = smoothstep(0.0, 1.0, 1.0 - abs(2.0 * centeredHue / RRT_RED_WIDTH));
		hueWeight *= hueWeight;
	}
	//float hueWeight = Square( smoothstep(0.0, 1.0, 1.0 - abs(2.0 * centeredHue / RRT_RED_WIDTH)) );

	aces.r += hueWeight * saturation * (RRT_RED_PIVOT - aces.r) * (1.0 - RRT_RED_SCALE);

	// Use ACEScg primaries as working space
	float3 acescg = max(0.0, ACES_to_ACEScg(aces));

	// Pre desaturate
	acescg = lerp(dot(acescg, AP1_RGB2Y).xxx, acescg, 0.96);

	const half ToeScale = 1 + FilmBlackClip - FilmToe;
	const half ShoulderScale = 1 + FilmWhiteClip - FilmShoulder;

	const float InMatch = 0.18;
	const float OutMatch = 0.18;

	float ToeMatch;
	if (FilmToe > 0.8)
	{
		// 0.18 will be on straight segment
		ToeMatch = (1 - FilmToe - OutMatch) / FilmSlope + log10(InMatch);
	}
	else
	{
		// 0.18 will be on toe segment

		// Solve for ToeMatch such that input of InMatch gives output of OutMatch.
		const float bt = (OutMatch + FilmBlackClip) / ToeScale - 1;
		ToeMatch = log10(InMatch) - 0.5 * log((1 + bt) / (1 - bt)) * (ToeScale / FilmSlope);
	}

	float StraightMatch = (1 - FilmToe) / FilmSlope - ToeMatch;
	float ShoulderMatch = FilmShoulder / FilmSlope - StraightMatch;

	half3 LogColor = log10(acescg);
	half3 StraightColor = FilmSlope * (LogColor + StraightMatch);

	half3 ToeColor = (-FilmBlackClip) + (2 * ToeScale) / (1 + exp((-2 * FilmSlope / ToeScale) * (LogColor - ToeMatch)));
	half3 ShoulderColor = (1 + FilmWhiteClip) - (2 * ShoulderScale) / (1 + exp((2 * FilmSlope / ShoulderScale) * (LogColor - ShoulderMatch)));

	ToeColor = LogColor < ToeMatch ? ToeColor : StraightColor;
	ShoulderColor = LogColor > ShoulderMatch ? ShoulderColor : StraightColor;

	half3 t = saturate((LogColor - ToeMatch) / (ShoulderMatch - ToeMatch));
	t = ShoulderMatch < ToeMatch ? 1 - t : t;
	t = (3 - 2 * t)*t*t;
	half3 linearCV = lerp(ToeColor, ShoulderColor, t);

	// Post desaturate
	linearCV = lerp(dot(float3(linearCV), AP1_RGB2Y), linearCV, 0.93);

	// Returning positive AP1 values
	//return max(0, linearCV);

	// Convert to display primary encoding
	// Rendering space RGB to XYZ
	float3 XYZ = mul(AP1_2_XYZ_MAT, linearCV);

	// Apply CAT from ACES white point to assumed observer adapted white point
	XYZ = mul(D60_2_D65_CAT, XYZ);

	// CIE XYZ to display primaries
	linearCV = mul(XYZ_2_REC709_MAT, XYZ);

	linearCV = saturate(linearCV); //Protection to make negative return out.

	return linearCV;

}
/////////////////SWS_UE4_ACES_END/////////////////

#endif

UE4의 unity3D용 ACES 코드

구현할 때 종종 씬 뷰에서 확인하는데, 채도는 씬 뷰에서 내부적으로 작동하는 것 같습니다.

linearCV = saturate(linearCV); 추가하지 않으면 게임 뷰에 블랙 클립에 의한 음수 값이 반환됩니다.

 

UE4 ACES 톤 매핑은 기본적으로 ODT_Rec709_100nits_dim을 사용합니다.

유니티에서 사용되는 ACES의 ODT_Rec709_100nits_dim( ) 함수만 살펴봅시다.

//Packages/com.unity.render-pipelines.core@11.0.0/ShaderLibrary/ACES.hlsl
// CIE XYZ to display primaries
linearCV = mul(XYZ_2_REC709_MAT, XYZ);

// Handle out-of-gamut values
// Clip values < 0 or > 1 (i.e. projecting outside the display primaries)
linearCV = saturate(linearCV);

ODT_Rec709_100nits_dim

 

ACES 코드 브리핑은 일단 생략하겠습니다. 아주 길고 긴 설명이 필요하니 다음 기회에...

하지만 관심이 있으시다면 아래 링크를 참조하시기 바랍니다.

ampas/aces-dev: AMPAS Academy Color Encoding System Developer Resources (github.com)

 

GitHub - ampas/aces-dev: AMPAS Academy Color Encoding System Developer Resources

AMPAS Academy Color Encoding System Developer Resources - GitHub - ampas/aces-dev: AMPAS Academy Color Encoding System Developer Resources

github.com

개인적으로 이 ACES를 완전히 이해하려면 거의 반년 동안 관련 주제를 다양하게 살펴봐야 할 것 같습니다.

 

Added Shader Keyword.

Packages/com.unity.render-pipelines.universal@11.0.0/Runtime/UniversalRenderPipelineCore.cs

public static class ShaderKeywordStrings
{
    ...
    public static readonly string TonemapACES = "_TONEMAP_ACES";
    public static readonly string TonemapNeutral = "_TONEMAP_NEUTRAL";
    /////////////////UE4_ACES_END/////////////////
    public static readonly string TonemapUE4ACES = "_TONEMAP_UE4ACES";
    /////////////////UE4_ACES_END/////////////////
...
}

public static readonly string TonemapUE4ACES = "_TONEMAP_UE4ACES"; 를 추가합니다.

 

Packages/com.unity.render-pipelines.universal@11.0.0/Runtime/Passes/PostProcessPass.cs

void SetupColorGrading(CommandBuffer cmd, ref RenderingData renderingData, Material material)
{
    ref var postProcessingData = ref renderingData.postProcessingData;
    bool hdr = postProcessingData.gradingMode == ColorGradingMode.HighDynamicRange;
    int lutHeight = postProcessingData.lutSize;
    int lutWidth = lutHeight * lutHeight;

    // Source material setup
    float postExposureLinear = Mathf.Pow(2f, m_ColorAdjustments.postExposure.value);
    cmd.SetGlobalTexture(ShaderConstants._InternalLut, m_InternalLut.Identifier());
    material.SetVector(ShaderConstants._Lut_Params, new Vector4(1f / lutWidth, 1f / lutHeight, lutHeight - 1f, postExposureLinear));
    material.SetTexture(ShaderConstants._UserLut, m_ColorLookup.texture.value);
    material.SetVector(ShaderConstants._UserLut_Params, !m_ColorLookup.IsActive()
        ? Vector4.zero
        : new Vector4(1f / m_ColorLookup.texture.value.width,
            1f / m_ColorLookup.texture.value.height,
            m_ColorLookup.texture.value.height - 1f,
            m_ColorLookup.contribution.value)
    );

    if (hdr)
    {
        material.EnableKeyword(ShaderKeywordStrings.HDRGrading);
    }
    else
    {
        switch (m_Tonemapping.mode.value)
        {
            case TonemappingMode.Neutral: material.EnableKeyword(ShaderKeywordStrings.TonemapNeutral); break;
            case TonemappingMode.ACES: material.EnableKeyword(ShaderKeywordStrings.TonemapACES); break;
            /////////////////UE4_ACES_BEGIN/////////////////
            case TonemappingMode.UE4_ACES: material.EnableKeyword(ShaderKeywordStrings.TonemapUE4ACES); break;
            default: break; // None
        }
        //////LDR Bind UI
        material.SetFloat("FilmSlope", (float)m_Tonemapping.slope);
        material.SetFloat("FilmToe", (float)m_Tonemapping.toe);
        material.SetFloat("FilmShoulder", (float)m_Tonemapping.shoulder);
        material.SetFloat("FilmBlackClip", (float)m_Tonemapping.blackClip);
        material.SetFloat("FilmWhiteClip", (float)m_Tonemapping.whiteClip);
    }
}
case TonemappingMode.UE4_ACES: material.EnableKeyword(ShaderKeywordStrings.TonemapUE4ACES); break;

셰이더에 전송할 인수를 설정합니다.

material.SetFloat("FilmSlope", (float)m_Tonemapping.slope);
 material.SetFloat("FilmToe", (float)m_Tonemapping.toe);
 material.SetFloat("FilmShoulder", (float)m_Tonemapping.shoulder);
 material.SetFloat("FilmBlackClip", (float)m_Tonemapping.blackClip);
 material.SetFloat("FilmWhiteClip", (float)m_Tonemapping.whiteClip);

 

Tone mapping applied.

Packages/src/com.unity.render-pipelines.universal@7.2.1/Shaders/PostProcessing/Common.hlsl

#ifndef UNIVERSAL_POSTPROCESSING_COMMON_INCLUDED
#define UNIVERSAL_POSTPROCESSING_COMMON_INCLUDED

#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl"
#include "Packages/com.unity.render-pipelines.universal/Shaders/Utils/Fullscreen.hlsl"
/////////////////UE4_ACES_BEGIN///////////////
#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/UE4_ACES.hlsl"
/////////////////UE4_ACES_END/////////////////

// ----------------------------------------------------------------------------------
// Render fullscreen mesh by using a matrix set directly by the pipeline instead of
// relying on the matrix set by the C++ engine to avoid issues with XR
half3 ApplyTonemap(half3 input)
{
#if _TONEMAP_ACES
    float3 aces = unity_to_ACES(input);
    input = AcesTonemap(aces);
#elif _TONEMAP_NEUTRAL
    input = NeutralTonemap(input);
    ///////////////////UE4_ACES_BEGIN/////////////////
#elif _TONEMAP_UE4ACES
    float3 aces = unity_to_ACES(input);
    input = UE4ACES(aces);
    ///////////////////UE4_ACES_END/////////////////
#endif

    return saturate(input);
}

 

Added multi-compilation keyword to UberPost.

UberPost에 멀티컴파일 키워드를 추가했습니다.

Assets/BundleRes/Shader/PostEffect/UberPost.shader

Shader "Hidden/Universal Render Pipeline/UberPost"
{
Properties
{
    [HideInInspector] _StencilRef("_StencilRef", Int) = 0
}
HLSLINCLUDE
    
#pragma multi_compile_local _ _DISTORTION
#pragma multi_compile_local _ _CHROMATIC_ABERRATION
#pragma multi_compile_local _ _BLOOM_LQ _BLOOM_HQ _BLOOM_LQ_DIRT _BLOOM_HQ_DIRT
#pragma multi_compile_local _ _HDR_GRADING _TONEMAP_ACES _TONEMAP_NEUTRAL _TONEMAP_UE4ACES /////////////////UE4_ACES_BEGIN/////////////////
#pragma multi_compile_local _ _FILM_GRAIN
#pragma multi_compile_local _ _DITHERING
#pragma multi_compile_local _ _LINEAR_TO_SRGB_CONVERSION

 

Add operation to lut builder.

Assets/BundleRes/Shader/PostEffect/LutBuilderHdr.shader

// Note: when the ACES tonemapper is selected the grading steps will be done using ACES spaces
float3 ColorGrade(float3 colorLutSpace)
{
    // Switch back to linear
    float3 colorLinear = LogCToLinear(colorLutSpace);

    // White balance in LMS space
    float3 colorLMS = LinearToLMS(colorLinear);
    colorLMS *= _ColorBalance.xyz;
    colorLinear = LMSToLinear(colorLMS);

    // Do contrast in log after white balance
    /////////////////UE4_ACES_BEGIN///////////////
    #if _TONEMAP_ACES || _TONEMAP_UE4ACES
    float3 colorLog = ACES_to_ACEScc(unity_to_ACES(colorLinear));
    /////////////////UE4_ACES_END///////////////
    #else
    float3 colorLog = LinearToLogC(colorLinear);
    #endif

    colorLog = (colorLog - ACEScc_MIDGRAY) * _HueSatCon.z + ACEScc_MIDGRAY;

    /////////////////UE4_ACES_BEGIN///////////////
    #if _TONEMAP_ACES || _TONEMAP_UE4ACES
    colorLinear = ACES_to_ACEScg(ACEScc_to_ACES(colorLog));
    /////////////////UE4_ACES_END///////////////
    #else
    colorLinear = LogCToLinear(colorLog);
    #endif

    // Color filter is just an unclipped multiplier
    colorLinear *= _ColorFilter.xyz;

    // Do NOT feed negative values to the following color ops
    colorLinear = max(0.0, colorLinear);
...
)

ColorGrade()에 _TONEMAP_UE4ACES 전처리 키워드를 추가합니다.

float3 Tonemap(float3 colorLinear)
{
    #if _TONEMAP_NEUTRAL
    {
        colorLinear = NeutralTonemap(colorLinear);
    }
    #elif _TONEMAP_ACES
    {
        // Note: input is actually ACEScg (AP1 w/ linear encoding)
        float3 aces = ACEScg_to_ACES(colorLinear);
        colorLinear = AcesTonemap(aces);
    }
    /////////////////UE4_ACES_BEGIN/////////////////
    #elif _TONEMAP_UE4ACES
    {
        float3 aces = ACEScg_to_ACES(colorLinear);
        colorLinear = UE4ACES(aces);
    }
		/////////////////UE4_ACES_END/////////////////
    #endif

    return colorLinear;
}

Packages/com.unity.render-pipelines.universal@11.0.0/Runtime/Passes/ColorGradingLutPass.cs

public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
{
    var cmd = CommandBufferPool.Get();
    using (new ProfilingScope(cmd, ProfilingSampler.Get(URPProfileId.ColorGradingLUT)))
    {
        ...

        // Secondary curves
        material.SetTexture(ShaderConstants._CurveHueVsHue, curves.hueVsHue.value.GetTexture());
        material.SetTexture(ShaderConstants._CurveHueVsSat, curves.hueVsSat.value.GetTexture());
        material.SetTexture(ShaderConstants._CurveLumVsSat, curves.lumVsSat.value.GetTexture());
        material.SetTexture(ShaderConstants._CurveSatVsSat, curves.satVsSat.value.GetTexture());
        
        /////////////////UE4_ACES_BEGIN/////////////////
        //HDR Bind UI
        material.SetFloat("FilmSlope", (float)tonemapping.slope);
        material.SetFloat("FilmToe", (float)tonemapping.toe);
        material.SetFloat("FilmShoulder", (float)tonemapping.shoulder);
        material.SetFloat("FilmBlackClip", (float)tonemapping.blackClip);
        material.SetFloat("FilmWhiteClip", (float)tonemapping.whiteClip);
        /////////////////UE4_ACES_END/////////////////

        // Tonemapping (baked into the lut for HDR)
        if (hdr)
        {
            material.shaderKeywords = null;

            switch (tonemapping.mode.value)
            {
                case TonemappingMode.Neutral: material.EnableKeyword(ShaderKeywordStrings.TonemapNeutral); break;
                case TonemappingMode.ACES: material.EnableKeyword(ShaderKeywordStrings.TonemapACES); break;
                /////////////////UE4_ACES_BEGIN/////////////////
                case TonemappingMode.UE4_ACES: material.EnableKeyword(ShaderKeywordStrings.TonemapUE4ACES); break;
                /////////////////UE4_ACES_END/////////////////
                default: break; // None
            }
        }
...
}

ColorGradingLutPass.cs 에 UE4 Aces 인수를 추가하고 키워드를 추가합니다.

부록.

중립적 톤맵핑.

 

racoon-artworks.de/cgbasics/tonemapping.php

 

https://www.racoon-artworks.de/cgbasics/tonemapping.php

Tonemapping Last updated 2019/01/12 Definition Tonemapping is generally understood as compressing a high dynamic range image into a medium that has less dynamic range available. In terms of 3D rendering, this means compressing the realistic, almost unlimit

www.racoon-artworks.de

float3 NeutralTonemap(float3 x, float A, float B, float C, float D, float E,
float F, float WL, float WC)
{
		// Tonemap
		float a = A;
		float b = B;
		float c = C;
		float d = D;
		float e = E;
		float f = F;
		float whiteLevel = WL;
		float whiteClip = WC;
		float3 whiteScale = (1.0).xxx / NeutralCurve(whiteLevel, a, b, c, d, e, f);
		x = NeutralCurve(x * whiteScale, a, b, c, d, e, f);
		x *= whiteScale;
		// Post-curve white point adjustment
		x /= whiteClip.xxx;
		
		return x;
}

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