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NAME

       im_dE_fromdisp,   im_dE_fromXYZ,  im_dECMC_fromdisp  -  derived  colour
       difference functions

SYNOPSIS

       #include <vips/vips.h>

       im_dE_fromdisp( in1, in2, out, display )
       IMAGE *in1, *in2, *out;
       struct im_col_display *display;

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

       im_dECMC_fromdisp( in1, in2, out, display )
       IMAGE *in1, *in2, *out;
       struct im_col_display *display;

DESCRIPTION

       These  functions  are  built  on  the  basic  VIPS  colour   difference
       measurements  as a convenience for the programmer. See im_dE_fromLab(3)
       for an explanation of the  colour  difference  metrics  and  the  basic
       comparision functions.

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