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NAME

       im_costra,  im_sintra,  im_tantra, im_acostra, im_asintra, im_atantra -
       basic trig functions

SYNOPSIS

       #include <vips/vips.h>

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

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

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

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

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

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

DESCRIPTION

       Basic trig functions. The input image is mapped through either  cos(3),
       sin(3) or tan(3) and written to out. All work in degrees.

       The  size  and number of bands are unchanged, the output type is float,
       unless the input is double, in which case the output is  double.   Non-
       complex images only!

RETURN VALUE

       Each function returns 0 on success and -1 on error.

SEE ALSO

       im_add(3), im_lintra(3), im_abs(3), im_mean(3), im_logtra(3)

COPYRIGHT

       National Gallery, 1995.

AUTHOR

       J. Cupitt - 21/7/93

                                 24 April 1991