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       im_affinei - apply an affine transform to an image


       #include <vips/vips.h>

       int im_affinei(in, out, interpolate, a, b, c, d, dx, dy, x, y, w, h)
       IMAGE *in, *out;
       VipsInterpolate *interpolate;
       double a, b, c, d, dx, dy;
       int x, y;
       int w, h;

       int im_affinei_all(in, out, interpolate, a, b, c, d, dx, dy)
       IMAGE *in, *out;
       VipsInterpolate *interpolate;
       double a, b, c, d, dx, dy;


       im_affinei(3) applies an affine transformation on the image held by the
       IMAGE descriptor in and puts the result at the location pointed by  the
       IMAGE  descriptor  out.  in many have any number of bands, be any size,
       and have any non-complex type.

       The transformation is described by a, b, c, d, dx, dy.  The point (x,y)
       in the input is mapped onto point (X,Y) in the output by

         X = a * x + b * y + dx
         Y = c * x + d * y + dy

       The area of the output image given by w, h, x, y is generated. (0,0) is
       the position of the  transformed  top-left-hand  corner  of  the  input

       Points   are   generated   using   the   supplied   interpolator.   See
       VipsInterpolate(3) for a list of the interpolators that come with vips.

       im_affinei_all(3)  is  a convenience function that transforms the whole
       of the input image. It calls im_affine(3) for you, with x y w h set  to
       exactly enclose the transformed image.


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


       As  with  most resamplers, im_affine(3) performs poorly at the edges of



                                8 February 2009                  IM_AFFINEI(3)