mlib_ImageColorHSV2RGB - HSV to RGB color conversion
cc [ flag... ] file... –lmlib [ library... ] #include <mlib.h> mlib_status mlib_ImageColorHSV2RGB(mlib_image *dst, const mlib_image *src);
The mlib_ImageColorHSV2RGB() function performs a conversion from hue/saturation/value to red/green/blue. The source and destination images must be three-channel images.
It uses the following equations:
P = V*(1 - S) Q = V*(1 - S*fraction(H*6)) T = V*(1 - S*(1 - 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, V, P, Q, T, R, G, B ≤ 1.
Assuming a pixel in the source image is (h, s, v) and its corresponding pixel in the destination image is (r, g, b), then for MLIB_BYTE images, the following applies:
H = h/256 S = s/255 V = v/255 r = R*255 g = G*255 b = B*255
for MLIB_SHORT images, the following applies:
H = (h + 32768)/65536 S = (s + 32768)/65535 V = (v + 32768)/65535 r = R*65535 - 32768 g = G*65535 - 32768 b = B*65535 - 32768
for MLIB_USHORT images, the following applies:
H = h/65536 S = s/65535 V = v/65535 r = R*65535 g = G*65535 b = B*65535
and for MLIB_INT images, the following applies:
H = (h + 2147483648)/4294967296 S = (s + 2147483648)/4294967295 V = (v + 2147483648)/4294967295 r = R*4294967295 - 2147483648 g = G*4294967295 - 2147483648 b = B*4294967295 - 2147483648
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:
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mlib_ImageColorHSV2RGB_Fp(3MLIB), mlib_ImageColorRGB2HSV(3MLIB), mlib_ImageColorRGB2HSV_Fp(3MLIB), attributes(5)