mlib_ImageColorRGB2HSV_Fp(3MLIB)

Name

mlib_ImageColorRGB2HSV_Fp - RGB to HSV color conversion

Synopsis

cc [ flag... ] file... –lmlib [ library... ]
#include <mlib.h>

mlib_status mlib_ImageColorRGB2HSV_Fp(mlib_image *dst,
     const mlib_image *src);

Description

The mlib_ImageColorRGB2HSV_Fp() function performs a conversion from red/green/blue to hue/saturation/value. 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)

   S = (V - Vmin)/V

   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, 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 also

mlib_ImageColorHSV2RGB(3MLIB), mlib_ImageColorHSV2RGB_Fp(3MLIB), mlib_ImageColorRGB2HSV(3MLIB), attributes(5)