mlib_ImageLookUp2(3MLIB)				    mediaLib Library Functions					  mlib_ImageLookUp2(3MLIB)

NAME

       mlib_ImageLookUp2 - table lookup

SYNOPSIS

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

       mlib_status mlib_ImageLookUp2(mlib_image *dst, const mlib_image *src,
	    const void **table, const mlib_s32 *offsets, mlib_s32 channels);

DESCRIPTION

       The mlib_ImageLookUp2() function maps the source image to the destination image by using the user-specified lookup table and an offset.

       The source and destination images must have the same width and height.

       The source and destination images can have different data types. See the following table for available variations of the table lookup func-
       tion on image types:

	  Type [*]	BYTE   SHORT	   USHORT	     INT	FLOAT	    DOUBLE
       ----------------------------------------------------------------------------------------
       MLIB_BIT 	Y
       MLIB_BYTE	Y      Y       Y		Y		Y	Y
       ----------------------------------------------------------------------------------------
       MLIB_SHORT	Y      Y       Y		Y		Y	Y
       ----------------------------------------------------------------------------------------
       MLIB_USHORT	Y      Y       Y		Y		Y	Y
       ----------------------------------------------------------------------------------------
       MLIB_INT 	Y      Y       Y		Y		Y	Y

       [*] Each row represents a source data type. Each column represents a destination data type.

       The source and destination images also can have a different number of channels. The source image can be a single-channel image or can  have
       the  same  number  of channels as the destination image. The lookup table can have one channel or have the same channels as the destination
       image. See the following table for possible variations on the number of channels in the images and the lookup table:

	# of channels in     # of channels in	   # of channels in
	the input image      the lookup table	   the output image
       --------------------------------------------------------------
	       1		     n			  n
	       n		     1			  n
	       n		     n			  n

       where, n = 1, 2, 3, 4.

       Each of the following equations is used in the corresponding case shown in the table above.

	 dst[x][y][i] = table[i][src[x][y][0] - offsets[i]]
	 dst[x][y][i] = table[0][src[x][y][i] - offsets[0]]
	 dst[x][y][i] = table[i][src[x][y][i] - offsets[i]]

PARAMETERS

       The function takes the following arguments:

       dst	   Pointer to destination image.

       src	   Pointer to source image.

       table	   Pointer to lookup table. The data type of the lookup table is the same as that of the destination image..  The  format  of  the
		   lookup table is:

		   table[channel][index]

		   The	entries  are  indexed  from  0 to 1, 2, ..., and so on. It is the user's responsibility to provide a lookup table that has
		   enough entries to cover all possible values of the pixel components deducted by the offset in each channel of the source image.

       offsets	    Offset values subtracted from the src pixel before table lookup.

       channels     Number of channels in the lookup table. If the number of channels equals 1, then the same table is applied	to  all  channels.
		   Otherwise, the number of channels must be no less than the number of channels in the destination 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_ImageLookUp(3MLIB), mlib_ImageLookUp_Inp(3MLIB), mlib_ImageLookUpMask(3MLIB), attributes(5)

SunOS 5.11							    2 Mar 2007						  mlib_ImageLookUp2(3MLIB)