opensolaris man page for mlib_imagecolorhsv2rgb

mlib_ImageColorHSV2RGB(3MLIB)				    mediaLib Library Functions				     mlib_ImageColorHSV2RGB(3MLIB)

NAME
       mlib_ImageColorHSV2RGB - HSV to RGB color conversion

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

       mlib_status mlib_ImageColorHSV2RGB(mlib_image *dst, const mlib_image *src);

DESCRIPTION
       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

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_Fp(3MLIB), mlib_ImageColorRGB2HSV(3MLIB), mlib_ImageColorRGB2HSV_Fp(3MLIB), attributes(5)

SunOS 5.11							    12 Sep 2007 				     mlib_ImageColorHSV2RGB(3MLIB)