mlib_ImageColorRGB2HSL_Fp(mediaLib Library Funmlib_ImageColorRGB2HSL_Fp(3MLIB)NAMEmlib_ImageColorRGB2HSL_Fp - RGB to HSL color conversion
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_ImageColorRGB2HSL_Fp(mlib_image *dst,
const mlib_image *src);
DESCRIPTION
The mlib_ImageColorRGB2HSL_Fp() function performs a conversion from
red/green/blue to hue/saturation/lightness. The source and destination
images must be three-channel images.
It uses the following equations:
V = max(R, G, B)
Vmin = min(R, G, B)
L = (V + Vmin)/2
S = (V - Vmin)/(V + Vmin) if L ≤ 1/2
S = (V - Vmin)/(2 - V - Vmin) if L > 1/2
H = (5.0 + (V - B)/(V - Vmin))/6 if R = V and G = Vmin
H = (1.0 - (V - G)/(V - Vmin))/6 if R = V and B = Vmin
H = (1.0 + (V - R)/(V - Vmin))/6 if G = V and B = Vmin
H = (3.0 - (V - B)/(V - Vmin))/6 if G = V and R = Vmin
H = (3.0 + (V - G)/(V - Vmin))/6 if B = V and R = Vmin
H = (5.0 - (V - R)/(V - Vmin))/6 if B = V and G = Vmin
H = 0.0 if R = G = B
where 0 ≤ R, G, B, V, Vmin, L, S ≤ 1 and 0 ≤ H < 1.
For MLIB_FLOAT and MLIB_DOUBLE images, the above equations are followed
verbatim. Input R, G, and B component values must be limited to the
[0.0, 1.0] range.
PARAMETERS
The function takes the following arguments:
dst Pointer to destination image.
src Pointer to source image.
RETURN VALUES
The function returns MLIB_SUCCESS if successful. Otherwise it returns
MLIB_FAILURE.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOmlib_ImageColorHSL2RGB(3MLIB), mlib_ImageColorHSL2RGB_Fp(3MLIB),
mlib_ImageColorRGB2HSL(3MLIB), attributes(5)SunOS 5.10 2 Mar 2007 mlib_ImageColorRGB2HSL_Fp(3MLIB)
