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NAME

       im_Lab2UCS,    im_LabQ2XYZ,   im_UCS2Lab,   im_Lab2disp,   im_disp2Lab,
       im_UCS2XYZ, im_XYZ2UCS - derived colour space conversion functions

SYNOPSIS

       #include <vips/vips.h>

       int im_Lab2UCS(in, out)
       IMAGE *in, *out;

       int im_LabQ2XYZ(in, out)
       IMAGE *in, *out;

       int im_UCS2Lab(in, out)
       IMAGE *in, *out;

       int im_Lab2disp(in, out, display)
       IMAGE *in, *out;
       struct im_col_display *display;

       int im_disp2Lab(in, out, display)
       IMAGE *in, *out;
       struct im_col_display *display;

       int im_UCS2XYZ(in, out)
       IMAGE *in, *out;

       int im_XYZ2UCS(in, out)
       IMAGE *in, *out;

DESCRIPTION

       These  functions  are  built   on   the   basic   VIPS   colour   space
       transformations  as a convenience for the programmer. See im_Lab2XYZ(3)
       for an explanation of  the  colour  spaces  and  the  basic  conversion
       functions.

       im_Lab2UCS(3), for example, is defined as:

         int
         im_Lab2UCS( IMAGE *in, IMAGE *out )
         {
            IMAGE *t1 = im_open_local( out,
               "im_Lab2UCS intermediate", "p" );

            if( !t1 ||
               im_Lab2LCh( in, t1 ) ||
               im_LCh2UCS( t1, out ) )
               return( -1 );

            return( 0 );
         }

RETURN VALUE

       The functions return 0 on success and -1 on error.

SEE ALSO

       im_col_XYZ2rgb(3), im_dE_fromLab(3), im_LabQ2Lab(3), im_Lab2disp(3).

COPYRIGHT

       National Gallery and Birkbeck College, 1990 - 1993

AUTHOR

       K. Martinez - 2/12/1992
       J. Cupitt - 21/7/93

                                2 December 1992                  IM_LAB2UCS(3)