mlib_ImageColorHSL2RGB_Fp - HSL to RGB color conversion
cc [ flag... ] file... –lmlib [ library... ] #include <mlib.h> mlib_status mlib_ImageColorHSL2RGB_Fp(mlib_image *dst, const mlib_image *src);
The mlib_ImageColorHSL2RGB_Fp() function performs a conversion from hue/saturation/lightness to red/green/blue. The source and destination images must be three-channel images.
It uses the following equations:
L' = L if L ≤ 1/2 L' = 1 - L if L > 1/2 V = L + S*L' P = L - S*L' Q = L + S*L'*(1 - 2*fraction(H*6)) T = L - S*L'*(1 - 2*fraction(H*6)) R, G, B = V, T, P if 0 ≤ H < 1/6 R, G, B = Q, V, P if 1/6 ≤ H < 2/6 R, G, B = P, V, T if 2/6 ≤ H < 3/6 R, G, B = P, Q, V if 3/6 ≤ H < 4/6 R, G, B = T, P, V if 4/6 ≤ H < 5/6 R, G, B = V, P, Q if 5/6 ≤ H < 1
where 0 ≤ H < 1 and 0 ≤ S, L, L', V, P, Q, T, R, G, B ≤ 1.
For MLIB_FLOAT and MLIB_DOUBLE images, the above equations are followed verbatim. Input H component values must be limited to the [0.0, 1.0) range. Input S and L component values must be limited to the [0.0, 1.0] range.
The function takes the following arguments:
Pointer to destination image.
Pointer to source image.
The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.
See attributes(5) for descriptions of the following attributes:
|
mlib_ImageColorHSL2RGB(3MLIB), mlib_ImageColorRGB2HSL(3MLIB), mlib_ImageColorRGB2HSL_Fp(3MLIB), attributes(5)