diff --git a/ModuleScripts/LerpColor3.lua b/ModuleScripts/LerpColor3.lua new file mode 100644 index 0000000..e20b6f3 --- /dev/null +++ b/ModuleScripts/LerpColor3.lua @@ -0,0 +1,88 @@ +-- Combines two colors in CIELUV space. +-- Color3 LerpCIELUV(Color3 fromColor, Color3 toColor, float t) +-- @author Fraktality + +-- https://www.w3.org/Graphics/Color/srgb + +local Black = Color3.fromRGB(0, 0, 0) + +return function(c0, c1, t) + local u0, v0, u1, v1 + + -- Convert from linear RGB to scaled CIELUV (RgbToLuv13) + local r, g, b = c0.r, c0.g, c0.b + -- Apply inverse gamma correction + r = r < 0.0404482362771076 and r/12.92 or 0.87941546140213*(r + 0.055)^2.4 + g = g < 0.0404482362771076 and g/12.92 or 0.87941546140213*(g + 0.055)^2.4 + b = b < 0.0404482362771076 and b/12.92 or 0.87941546140213*(b + 0.055)^2.4 + -- sRGB->XYZ->CIELUV + local y = 0.2125862307855956*r + 0.71517030370341085*g + 0.0722004986433362*b + local z = 3.6590806972265883*r + 11.4426895800574232*g + 4.1149915024264843*b + local l0 = y > 0.008856451679035631 and 116*y^(1/3) - 16 or 903.296296296296*y + if z > 1e-15 then + u0, v0 = l0*(0.9257063972951867*r - 0.8333736323779866*g - 0.09209820666085898*b)/z, l0*(9*y/z - 0.46832) + else + u0, v0 = -0.19783*l0, -0.46832*l0 + end + + -- Convert from linear RGB to scaled CIELUV (RgbToLuv13) + r, g, b = c1.r, c1.g, c1.b + -- Apply inverse gamma correction + r = r < 0.0404482362771076 and r/12.92 or 0.87941546140213*(r + 0.055)^2.4 + g = g < 0.0404482362771076 and g/12.92 or 0.87941546140213*(g + 0.055)^2.4 + b = b < 0.0404482362771076 and b/12.92 or 0.87941546140213*(b + 0.055)^2.4 + -- sRGB->XYZ->CIELUV + y = 0.2125862307855956*r + 0.71517030370341085*g + 0.0722004986433362*b + z = 3.6590806972265883*r + 11.4426895800574232*g + 4.1149915024264843*b + local l1 = y > 0.008856451679035631 and 116*y^(1/3) - 16 or 903.296296296296*y + if z > 1e-15 then + u1, v1 = l1*(0.9257063972951867*r - 0.8333736323779866*g - 0.09209820666085898*b)/z, l1*(9*y/z - 0.46832) + else + u1, v1 = -0.19783*l1, -0.46832*l1 + end + + -- The inputs aren't needed anymore, so don't drag out their lifetimes + -- c0, c1 = nil, nil + + -- return function(t) + -- Interpolate + local l = (1 - t)*l0 + t*l1 + if l < 0.0197955 then + return Black + end + local u = ((1 - t)*u0 + t*u1)/l + 0.19783 + local v = ((1 - t)*v0 + t*v1)/l + 0.46832 + + -- CIELUV->XYZ + y = (l + 16)/116 + y = y > 0.206896551724137931 and y*y*y or 0.12841854934601665*y - 0.01771290335807126 + local x = y*u/v + z = y*((3 - 0.75*u)/v - 5) + + -- XYZ->linear sRGB + r = 7.2914074*x - 1.5372080*y - 0.4986286*z + g = -2.1800940*x + 1.8757561*y + 0.0415175*z + b = 0.1253477*x - 0.2040211*y + 1.0569959*z + + -- Adjust for the lowest out-of-bounds component + if r < 0 and r < g and r < b then + r, g, b = 0, g - r, b - r + elseif g < 0 and g < b then + r, g, b = r - g, 0, b - g + elseif b < 0 then + r, g, b = r - b, g - b, 0 + end + + -- Apply gamma correction + r = r < 3.1306684425e-3 and 12.92*r or 1.055*r^(1/2.4) - 0.055 + g = g < 3.1306684425e-3 and 12.92*g or 1.055*g^(1/2.4) - 0.055 + b = b < 3.1306684425e-3 and 12.92*b or 1.055*b^(1/2.4) - 0.055 + + return Color3.new( + -- Clamp the result + r > 1 and 1 or r < 0 and 0 or r, + g > 1 and 1 or g < 0 and 0 or g, + b > 1 and 1 or b < 0 and 0 or b + ) + -- end +end \ No newline at end of file