'\" te
.\" Copyright (c) 2007, Sun Microsystems, Inc.  All Rights Reserved 
.TH mlib_ImageColorTrue2Index 3MLIB "2 Mar 2007" "SunOS 5.11" "mediaLib Library Functions"
.SH NAME
mlib_ImageColorTrue2Index \- true color to indexed color using nearest matched LUT entries
.SH SYNOPSIS
.LP
.nf
cc [ \fIflag\fR... ] \fIfile\fR... \fB-lmlib\fR [ \fIlibrary\fR... ]
#include <mlib.h>

\fBmlib_status\fR \fBmlib_ImageColorTrue2Index\fR(\fBmlib_image *\fR\fIdst\fR,
     \fBconst mlib_image *\fR\fIsrc\fR, \fBconst void *\fR\fIcolormap\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBmlib_ImageColorTrue2Index()\fR function converts a true color image to a pseudo color image with the method of finding the nearest matched lookup table entry for each pixel. The source image can be an \fBMLIB_BYTE\fR or \fBMLIB_SHORT\fR image with three or four channels. The destination must be a single-channel \fBMLIB_BYTE\fR or \fBMLIB_SHORT\fR image.
.sp
.LP
The last parameter, \fIcolormap\fR, is an internal data structure (which includes the lookup table) for inverse color mapping. Create it by calling the \fBmlib_ImageColorTrue2IndexInit()\fR function.
.SH PARAMETERS
.sp
.LP
The function takes the following arguments:
.sp
.ne 2
.mk
.na
\fB\fIdst\fR\fR
.ad
.RS 12n
.rt  
Pointer to destination or destination image.
.RE

.sp
.ne 2
.mk
.na
\fB\fIsrc\fR\fR
.ad
.RS 12n
.rt  
Pointer to source or source image.
.RE

.sp
.ne 2
.mk
.na
\fB\fIcolormap\fR\fR
.ad
.RS 12n
.rt  
Internal data structure for inverse color mapping.
.RE

.SH RETURN VALUES
.sp
.LP
The function returns \fBMLIB_SUCCESS\fR if successful. Otherwise it returns \fBMLIB_FAILURE\fR.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilityCommitted
_
MT-LevelMT-Safe
.TE

.SH SEE ALSO
.sp
.LP
\fBmlib_ImageColorErrorDiffusion3x3\fR(3MLIB), \fBmlib_ImageColorOrderedDither8x8\fR(3MLIB), \fBmlib_ImageColorTrue2IndexFree\fR(3MLIB), \fBmlib_ImageColorTrue2IndexInit\fR(3MLIB), \fBattributes\fR(5)