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Colorspace Conversion Node

Description

Returns the result of converting the value of input In from one colorspace space to another. The spaces to transform from and to are defined by the values of the dropdowns on the node.

Ports

Name Direction Type Description
In Input Vector 3 Input value
Out Output Vector 3 Output value

Controls

Name Type Options Description
From Dropdown RGB, Linear, HSV Selects the colorspace to convert from
To Dropdown RGB, Linear, HSV Selects the colorspace to convert to

Generated Code Example

The following example code represents one possible outcome of this node per from/to permutation.

RGB > RGB

void Unity_ColorspaceConversion_RGB_RGB_float(float3 In, out float3 Out)
{
    Out =  In;
}

RGB > Linear

void Unity_ColorspaceConversion_RGB_Linear_float(float3 In, out float3 Out)
{
    float3 linearRGBLo = In / 12.92;;
    float3 linearRGBHi = pow(max(abs((In + 0.055) / 1.055), 1.192092896e-07), float3(2.4, 2.4, 2.4));
    Out = float3(In <= 0.04045) ? linearRGBLo : linearRGBHi;
}

RGB > HSV

void Unity_ColorspaceConversion_RGB_HSV_float(float3 In, out float3 Out)
{
    float4 K = float4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
    float4 P = lerp(float4(In.bg, K.wz), float4(In.gb, K.xy), step(In.b, In.g));
    float4 Q = lerp(float4(P.xyw, In.r), float4(In.r, P.yzx), step(P.x, In.r));
    float D = Q.x - min(Q.w, Q.y);
    float  E = 1e-10;
    Out = float3(abs(Q.z + (Q.w - Q.y)/(6.0 * D + E)), D / (Q.x + E), Q.x);
}

Linear > RGB

void Unity_ColorspaceConversion_Linear_RGB_float(float3 In, out float3 Out)
{
    float3 sRGBLo = In * 12.92;
    float3 sRGBHi = (pow(max(abs(In), 1.192092896e-07), float3(1.0 / 2.4, 1.0 / 2.4, 1.0 / 2.4)) * 1.055) - 0.055;
    Out = float3(In <= 0.0031308) ? sRGBLo : sRGBHi;
}

Linear > Linear

void Unity_ColorspaceConversion_Linear_Linear_float(float3 In, out float3 Out)
{
    Out = In;
}

Linear > HSV

void Unity_ColorspaceConversion_Linear_HSV_float(float3 In, out float3 Out)
{
    float3 sRGBLo = In * 12.92;
    float3 sRGBHi = (pow(max(abs(In), 1.192092896e-07), float3(1.0 / 2.4, 1.0 / 2.4, 1.0 / 2.4)) * 1.055) - 0.055;
    float3 Linear = float3(In <= 0.0031308) ? sRGBLo : sRGBHi;
    float4 K = float4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
    float4 P = lerp(float4(Linear.bg, K.wz), float4(Linear.gb, K.xy), step(Linear.b, Linear.g));
    float4 Q = lerp(float4(P.xyw, Linear.r), float4(Linear.r, P.yzx), step(P.x, Linear.r));
    float D = Q.x - min(Q.w, Q.y);
    float  E = 1e-10;
    Out = float3(abs(Q.z + (Q.w - Q.y)/(6.0 * D + E)), D / (Q.x + E), Q.x);
}

HSV > RGB

void Unity_ColorspaceConversion_HSV_RGB_float(float3 In, out float3 Out)
{
    float4 K = float4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
    float3 P = abs(frac(In.xxx + K.xyz) * 6.0 - K.www);
    Out = In.z * lerp(K.xxx, saturate(P - K.xxx), In.y);
}

HSV > Linear

void Unity_ColorspaceConversion_HSV_Linear_float(float3 In, out float3 Out)
{
    float4 K = float4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
    float3 P = abs(frac(In.xxx + K.xyz) * 6.0 - K.www);
    float3 RGB = In.z * lerp(K.xxx, saturate(P - K.xxx), In.y);
    float3 linearRGBLo = RGB / 12.92;
    float3 linearRGBHi = pow(max(abs((RGB + 0.055) / 1.055), 1.192092896e-07), float3(2.4, 2.4, 2.4));
    Out = float3(RGB <= 0.04045) ? linearRGBLo : linearRGBHi;
}

HSV > HSV

void Unity_ColorspaceConversion_HSV_HSV_float(float3 In, out float3 Out)
{
    Out = In;
}