比较全的色彩模式之间的转换算法 - 就介个

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2009-03-15

比较全的色彩模式之间的转换算法 - [RIA]
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 http://leenmax.blogbus.com/logs/36602822.html

XYZ —> RGB
1. var_X = X / 100 //X from 0 to 95.047 (Observer = 2°, Illuminant = D65)
2. var_Y = Y / 100 //Y from 0 to 100.000
3. var_Z = Z / 100 //Z from 0 to 108.883
4. var_R = var_X * 3.2406 + var_Y * -1.5372 + var_Z * -0.4986
5. var_G = var_X * -0.9689 + var_Y * 1.8758 + var_Z * 0.0415
6. var_B = var_X * 0.0557 + var_Y * -0.2040 + var_Z * 1.0570
7. if ( var_R > 0.0031308 ) var_R = 1.055 * ( var_R ^ ( 1 / 2.4 ) ) - 0.055
8. else var_R = 12.92 * var_R
9. if ( var_G > 0.0031308 ) var_G = 1.055 * ( var_G ^ ( 1 / 2.4 ) ) - 0.055
10. else var_G = 12.92 * var_G
11. if ( var_B > 0.0031308 ) var_B = 1.055 * ( var_B ^ ( 1 / 2.4 ) ) - 0.055
12. else var_B = 12.92 * var_B
13. R = var_R * 255
14. G = var_G * 255
15. B = var_B * 255
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RGB —> XYZ
1. var_R = ( R / 255 ) //R from 0 to 255
2. var_G = ( G / 255 ) //G from 0 to 255
3. var_B = ( B / 255 ) //B from 0 to 255
4. if ( var_R > 0.04045 ) var_R = ( ( var_R + 0.055 ) / 1.055 ) ^ 2.4
5. else var_R = var_R / 12.92
6. if ( var_G > 0.04045 ) var_G = ( ( var_G + 0.055 ) / 1.055 ) ^ 2.4
7. else var_G = var_G / 12.92
8. if ( var_B > 0.04045 ) var_B = ( ( var_B + 0.055 ) / 1.055 ) ^ 2.4
9. else var_B = var_B / 12.92
10. var_R = var_R * 100
11. var_G = var_G * 100
12. var_B = var_B * 100
13. //Observer. = 2°, Illuminant = D65
14. X = var_R * 0.4124 + var_G * 0.3576 + var_B * 0.1805
15. Y = var_R * 0.2126 + var_G * 0.7152 + var_B * 0.0722
16. Z = var_R * 0.0193 + var_G * 0.1192 + var_B * 0.9505
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XYZ —> Yxy
1. //X from 0 to 95.047 Observer. = 2°, Illuminant = D65
2. //Y from 0 to 100.000
3. //Z from 0 to 108.883
4. Y = Y
5. x = X / ( X + Y + Z )
6. y = Y / ( X + Y + Z )
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Yxy —> XYZ
1. //Y from 0 to 100
2. //x from 0 to 1
3. //y from 0 to 1
4. X = x * ( Y / y )
5. Y = Y
6. Z = ( 1 - x - y ) * ( Y / y )
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XYZ —> Hunter-Lab
1. (H)L = 10 * sqrt( Y )
2. (H)a = 17.5 * ( ( ( 1.02 * X ) - Y ) / sqrt( Y ) )
3. (H)b = 7 * ( ( Y - ( 0.847 * Z ) ) / sqrt( Y ) )
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Hunter-Lab —> XYZ
1. var_Y = (H)L / 10
2. var_X = (H)a / 17.5 * (H)L / 10
3. var_Z = (H)b / 7 * (H)L / 10
4. Y = var_Y ^ 2
5. X = ( var_X + Y ) / 1.02
6. Z = -( var_Z - Y ) / 0.847
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XYZ —> CIE-L*ab
1. var_X = X / ref_X //ref_X = 95.047 Observer= 2°, Illuminant= D65
2. var_Y = Y / ref_Y //ref_Y = 100.000
3. var_Z = Z / ref_Z //ref_Z = 108.883
4. if ( var_X > 0.008856 ) var_X = var_X ^ ( 1/3 )
5. else var_X = ( 7.787 * var_X ) + ( 16 / 116 )
6. if ( var_Y > 0.008856 ) var_Y = var_Y ^ ( 1/3 )
7. else var_Y = ( 7.787 * var_Y ) + ( 16 / 116 )
8. if ( var_Z > 0.008856 ) var_Z = var_Z ^ ( 1/3 )
9. else var_Z = ( 7.787 * var_Z ) + ( 16 / 116 )
10. CIE-L* = ( 116 * var_Y ) - 16
11. CIE-a* = 500 * ( var_X - var_Y )
12. CIE-b* = 200 * ( var_Y - var_Z )
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CIE-L*ab —> XYZ
1. var_Y = ( CIE-L* + 16 ) / 116
2. var_X = CIE-a* / 500 + var_Y
3. var_Z = var_Y - CIE-b* / 200
4. if ( var_Y^3 > 0.008856 ) var_Y = var_Y^3
5. else var_Y = ( var_Y - 16 / 116 ) / 7.787
6. if ( var_X^3 > 0.008856 ) var_X = var_X^3
7. else var_X = ( var_X - 16 / 116 ) / 7.787
8. if ( var_Z^3 > 0.008856 ) var_Z = var_Z^3
9. else var_Z = ( var_Z - 16 / 116 ) / 7.787
10. X = ref_X * var_X //ref_X = 95.047 Observer= 2°, Illuminant= D65
11. Y = ref_Y * var_Y //ref_Y = 100.000
12. Z = ref_Z * var_Z //ref_Z = 108.883
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CIE-L*ab —> CIE-L*CH°
1. var_H = arc_tangent( CIE-b*, CIE-a* ) //Quadrant by signs
2. if ( var_H > 0 ) var_H = ( var_H / PI ) * 180
3. else var_H = 360 - ( abs( var_H ) / PI ) * 180
4. CIE-L* = CIE-L*
5. CIE-C* = sqrt( CIE-a* ^ 2 + CIE-b* ^ 2 )
6. CIE-H° = var_H
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CIE-L*CH° —>CIE-L*ab
1. //CIE-H° from 0 to 360°
2. CIE-L* = CIE-L*
3. CIE-a* = cos( degree_2_radian( CIE-H° ) ) * CIE-C*
4. CIE-b* = sin( degree_2_radian( CIE-H° ) ) * CIE-C*
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XYZ —> CIE-L*uv
1. var_U = ( 4 * X ) / ( X + ( 15 * Y ) + ( 3 * Z ) )
2. var_V = ( 9 * Y ) / ( X + ( 15 * Y ) + ( 3 * Z ) )
3. var_Y = Y / 100
4. if ( var_Y > 0.008856 ) var_Y = var_Y ^ ( 1/3 )
5. else var_Y = ( 7.787 * var_Y ) + ( 16 / 116 )
6. ref_X = 95.047 //Observer= 2°, Illuminant= D65
7. ref_Y = 100.000
8. ref_Z = 108.883
9. ref_U = ( 4 * ref_X ) / ( ref_X + ( 15 * ref_Y ) + ( 3 * ref_Z ) )
10. ref_V = ( 9 * ref_Y ) / ( ref_X + ( 15 * ref_Y ) + ( 3 * ref_Z ) )
11. CIE-L* = ( 116 * var_Y ) - 16
12. CIE-u* = 13 * CIE-L* * ( var_U - ref_U )
13. CIE-v* = 13 * CIE-L* * ( var_V - ref_V )
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CIE-L*uv —> XYZ
1. var_Y = ( CIE-L* + 16 ) / 116
2. if ( var_Y^3 > 0.008856 ) var_Y = var_Y^3
3. else var_Y = ( var_Y - 16 / 116 ) / 7.787
4. ref_X = 95.047 //Observer= 2°, Illuminant= D65
5. ref_Y = 100.000
6. ref_Z = 108.883
7. ref_U = ( 4 * ref_X ) / ( ref_X + ( 15 * ref_Y ) + ( 3 * ref_Z ) )
8. ref_V = ( 9 * ref_Y ) / ( ref_X + ( 15 * ref_Y ) + ( 3 * ref_Z ) )
9. var_U = CIE-u* / ( 13 * CIE-L* ) + ref_U
10. var_V = CIE-v* / ( 13 * CIE-L* ) + ref_V
11. Y = var_Y * 100
12. X = - ( 9 * Y * var_U ) / ( ( var_U - 4 ) * var_V - var_U * var_V )
13. Z = ( 9 * Y - ( 15 * var_V * Y ) - ( var_V * X ) ) / ( 3 * var_V )
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RGB —> HSL
1. var_R = ( R / 255 ) //RGB from 0 to 255
2. var_G = ( G / 255 )
3. var_B = ( B / 255 )
4. var_Min = min( var_R, var_G, var_B ) //Min. value of RGB
5. var_Max = max( var_R, var_G, var_B ) //Max. value of RGB
6. del_Max = var_Max - var_Min //Delta RGB value
7. L = ( var_Max + var_Min ) / 2
8. if ( del_Max == 0 ) //This is a gray, no chroma...
9. {
10. H = 0 //HSL results from 0 to 1
11. S = 0
12. }
13. else //Chromatic data...
14. {
15. if ( L < 0.5 ) S = del_Max / ( var_Max + var_Min )
16. else S = del_Max / ( 2 - var_Max - var_Min )
17. del_R = ( ( ( var_Max - var_R ) / 6 ) + ( del_Max / 2 ) ) / del_Max
18. del_G = ( ( ( var_Max - var_G ) / 6 ) + ( del_Max / 2 ) ) / del_Max
19. del_B = ( ( ( var_Max - var_B ) / 6 ) + ( del_Max / 2 ) ) / del_Max
20. if ( var_R == var_Max ) H = del_B - del_G
21. else if ( var_G == var_Max ) H = ( 1 / 3 ) + del_R - del_B
22. else if ( var_B == var_Max ) H = ( 2 / 3 ) + del_G - del_R
23. if ( H < 0 ) ; H += 1
24. if ( H > 1 ) ; H -= 1
25. }
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HSL —> RGB
1. if ( S == 0 ) //HSL from 0 to 1
2. {
3. R = L * 255 //RGB results from 0 to 255
4. G = L * 255
5. B = L * 255
6. }
7. else
8. {
9. if ( L < 0.5 ) var_2 = L * ( 1 + S )
10. else var_2 = ( L + S ) - ( S * L )
11. var_1 = 2 * L - var_2
12. R = 255 * Hue_2_RGB( var_1, var_2, H + ( 1 / 3 ) )
13. G = 255 * Hue_2_RGB( var_1, var_2, H )
14. B = 255 * Hue_2_RGB( var_1, var_2, H - ( 1 / 3 ) )
15. }
17. --------------------------------------------------------------------------------
18. Hue_2_RGB( v1, v2, vH ) //Function Hue_2_RGB
19. {
20. if ( vH < 0 ) vH += 1
21. if ( vH > 1 ) vH -= 1
22. if ( ( 6 * vH ) < 1 ) return ( v1 + ( v2 - v1 ) * 6 * vH )
23. if ( ( 2 * vH ) < 1 ) return ( v2 )
24. if ( ( 3 * vH ) < 2 ) return ( v1 + ( v2 - v1 ) * ( ( 2 / 3 ) - vH ) * 6 )
25. return ( v1 )
26. }
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RGB —> HSV
1. var_R = ( R / 255 ) //RGB from 0 to 255
2. var_G = ( G / 255 )
3. var_B = ( B / 255 )
4. var_Min = min( var_R, var_G, var_B ) //Min. value of RGB
5. var_Max = max( var_R, var_G, var_B ) //Max. value of RGB
6. del_Max = var_Max - var_Min //Delta RGB value
7. V = var_Max
8. if ( del_Max == 0 ) //This is a gray, no chroma...
9. {
10. H = 0 //HSV results from 0 to 1
11. S = 0
12. }
13. else //Chromatic data...
14. {
15. S = del_Max / var_Max
16. del_R = ( ( ( var_Max - var_R ) / 6 ) + ( del_Max / 2 ) ) / del_Max
17. del_G = ( ( ( var_Max - var_G ) / 6 ) + ( del_Max / 2 ) ) / del_Max
18. del_B = ( ( ( var_Max - var_B ) / 6 ) + ( del_Max / 2 ) ) / del_Max
19. if ( var_R == var_Max ) H = del_B - del_G
20. else if ( var_G == var_Max ) H = ( 1 / 3 ) + del_R - del_B
21. else if ( var_B == var_Max ) H = ( 2 / 3 ) + del_G - del_R
22. if ( H < 0 ) ; H += 1
23. if ( H > 1 ) ; H -= 1
24. }
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HSV —> RGB
1. if ( S == 0 ) //HSV from 0 to 1
2. {
3. R = V * 255
4. G = V * 255
5. B = V * 255
6. }
7. else
8. {
9. var_h = H * 6
10. if ( var_h == 6 ) var_h = 0 //H must be < 1
11. var_i = int( var_h ) //Or ... var_i = floor( var_h )
12. var_1 = V * ( 1 - S )
13. var_2 = V * ( 1 - S * ( var_h - var_i ) )
14. var_3 = V * ( 1 - S * ( 1 - ( var_h - var_i ) ) )
15. if ( var_i == 0 ) { var_r = V ; var_g = var_3 ; var_b = var_1 }
16. else if ( var_i == 1 ) { var_r = var_2 ; var_g = V ; var_b = var_1 }
17. else if ( var_i == 2 ) { var_r = var_1 ; var_g = V ; var_b = var_3 }
18. else if ( var_i == 3 ) { var_r = var_1 ; var_g = var_2 ; var_b = V }
19. else if ( var_i == 4 ) { var_r = var_3 ; var_g = var_1 ; var_b = V }
20. else { var_r = V ; var_g = var_1 ; var_b = var_2 }
21. R = var_r * 255 //RGB results from 0 to 255
22. G = var_g * 255
23. B = var_b * 255
24. }
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RGB —> CMY
1. //RGB values from 0 to 255
2. //CMY results from 0 to 1
3. C = 1 - ( R / 255 )
4. M = 1 - ( G / 255 )
5. Y = 1 - ( B / 255 )
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CMY —> RGB
1. //CMY values from 0 to 1
2. //RGB results from 0 to 255
3. R = ( 1 - C ) * 255
4. G = ( 1 - M ) * 255
5. B = ( 1 - Y ) * 255
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CMY —> CMYK
1. //CMYK and CMY values from 0 to 1
2. var_K = 1
3. if ( C < var_K ) var_K = C
4. if ( M < var_K ) var_K = M
5. if ( Y < var_K ) var_K = Y
6. if ( var_K == 1 ) { //Black
7. C = 0
8. M = 0
9. Y = 0
10. }
11. else {
12. C = ( C - var_K ) / ( 1 - var_K )
13. M = ( M - var_K ) / ( 1 - var_K )
14. Y = ( Y - var_K ) / ( 1 - var_K )
15. }
16. K = var_K
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CMYK —> CMY
1. //CMYK and CMY values from 0 to 1
2. C = ( C * ( 1 - K ) + K )
3. M = ( M * ( 1 - K ) + K )
4. Y = ( Y * ( 1 - K ) + K )
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就介个

2009-03-15

比较全的色彩模式之间的转换算法 - [RIA]

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