Content-type: text/html Man page of mlib_ImageColorRGB2HSL_Fp

mlib_ImageColorRGB2HSL_Fp

Section: mediaLib Library Functions (3MLIB)
Updated: 2 Mar 2007
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NAME

mlib_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 TYPEATTRIBUTE VALUE

Interface StabilityCommitted

MT-Level

 

SEE ALSO

mlib_ImageColorHSL2RGB(3MLIB), mlib_ImageColorHSL2RGB_Fp(3MLIB), mlib_ImageColorRGB2HSL(3MLIB), attributes(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
PARAMETERS
RETURN VALUES
ATTRIBUTES
SEE ALSO

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Time: 02:37:57 GMT, October 02, 2010