mlib_imagecolorhsv2rgb(3mlib) [sunos man page]

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	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_ImageColorHSV2RGB_Fp(3MLIB), mlib_ImageColorRGB2HSV(3MLIB), mlib_ImageColorRGB2HSV_Fp(3MLIB), attributes(5)

SunOS 5.10							    10 Nov 2004 				     mlib_ImageColorHSV2RGB(3MLIB)

mlib_ImageColorRGB2HSV(3MLIB)				    mediaLib Library Functions				     mlib_ImageColorRGB2HSV(3MLIB)

NAME

       mlib_ImageColorRGB2HSV - RGB to HSV color conversion

SYNOPSIS

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

       mlib_status mlib_ImageColorRGB2HSV(mlib_image *dst, const mlib_image *src);

DESCRIPTION

       The  mlib_ImageColorRGB2HSV() 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.

       Assuming a pixel in the source image is (r, g, b) and its corresponding pixel in the destination image is (h, s,  v),  then  for  MLIB_BYTE
       images, the following applies:

	    R = r/255
	    G = g/255
	    B = b/255
	    h = H*256
	    s = S*255
	    v = V*255

       for MLIB_SHORT images, the following applies:

	    R = (r + 32768)/65535
	    G = (g + 32768)/65535
	    B = (b + 32768)/65535
	    h = H*65536 - 32768
	    s = S*65535 - 32768
	    v = V*65535 - 32768

       for MLIB_USHORT images, the following applies:

	    R = r/65535
	    G = g/65535
	    B = b/65535
	    h = H*65536
	    s = S*65535
	    v = V*65535

       and for MLIB_INT images, the following applies:

	    R = (r + 2147483648)/4294967295
	    G = (g + 2147483648)/4294967295
	    B = (b + 2147483648)/4294967295
	    h = H*4294967296 - 2147483648
	    s = S*4294967295 - 2147483648
	    v = V*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(3MLIB), mlib_ImageColorHSV2RGB_Fp(3MLIB), mlib_ImageColorRGB2HSV_Fp(3MLIB), attributes(5)

SunOS 5.11							    2 Mar 2007					     mlib_ImageColorRGB2HSV(3MLIB)