im_floor(3)
for each pixel, find the largest integral value not greater than
SYNOPSIS
#include <vips/vips.h>
int im_floor( in, out )
IMAGE *in, *out;
DESCRIPTION
im_floor(3)
finds the largest integral value not greater than. Copy for integer types,
call
floor(3) for float and complex types. Output type == input type.
RETURN VALUE
The function returns 0 on success and -1 on error.