How to use the wand.api.library.MagickCoalesceImages function in Wand

raise TypeError("crop must be a string, not " + repr(crop))
        if not isinstance(resize, string_type):
            raise TypeError("resize must be a string, not " + repr(resize))
        # Also verify that only ASCII characters are included
        try:
            crop = crop.encode('ascii')
        except UnicodeEncodeError:
            raise ValueError('crop must only contain ascii-encodable ' +
                             'characters.')
        try:
            resize = resize.encode('ascii')
        except UnicodeEncodeError:
            raise ValueError('resize must only contain ascii-encodable ' +
                             'characters.')
        if self.animation:
            new_wand = library.MagickCoalesceImages(self.wand)
            length = len(self.sequence)
            for i in xrange(length):
                library.MagickSetIteratorIndex(new_wand, i)
                if i:
                    library.MagickAddImage(
                        new_wand,
                        library.MagickTransformImage(new_wand, crop, resize)
                    )
                else:
                    new_wand = library.MagickTransformImage(new_wand,
                                                            crop,
                                                            resize)
            self.sequence.instances = []
        else:
            new_wand = library.MagickTransformImage(self.wand, crop, resize)
        if not new_wand:

elif not isinstance(start_width, numbers.Integral):
            raise TypeError('start_width must be an integer, not ' + repr(height))
        elif not isinstance(start_height, numbers.Integral):
            raise TypeError('start_height must be an integer, not ' + repr(height))
        elif not isinstance(delta_x, numbers.Real):
            raise TypeError('delta_x must be a float, not ' + repr(delta_x))
        elif not isinstance(rigidity, numbers.Real):
            raise TypeError('rigidity must be a float, not ' + repr(rigidity))

        if self.animation:
            # scale each frame in the image, linearly scaling the rescale amount per frame
            # if start_width/height != rescale_width/height

            # coalesce outputs each frame as the viewer sees it instead of in its optimized form, as rescaling a
            # non-coalesced image results in artifacts on the optimized frames
            self.wand = library.MagickCoalesceImages(self.wand)

            num_frames = len(self.sequence)
            rescale_width_step = float(start_width - width) / num_frames
            rescale_height_step = float(start_height - height) / num_frames

            def _rescale_frame(index):
                rescale_width = int(start_width - rescale_width_step * index)
                rescale_height = int(start_height - rescale_height_step * index)

                rescaled_frame = ContentAwareImage(image=self.sequence[index])
                rescaled_frame.content_aware_scale(rescale_width, rescale_height, start_width, start_height,
                                                   units_percent=units_percent, use_slow_scaling=use_slow_scaling,
                                                   delta_x=delta_x, rigidity=rigidity)
                return rescaled_frame

            # process gifs concurrently for maximum speed

raise TypeError('blur must be numbers.Real , not ' + repr(blur))
        elif not isinstance(filter, (string_type, numbers.Integral)):
            raise TypeError('filter must be one string defined in wand.image.'
                            'FILTER_TYPES or an integer, not ' + repr(filter))
        if isinstance(filter, string_type):
            try:
                filter = FILTER_TYPES.index(filter)
            except IndexError:
                raise ValueError(repr(filter) + ' is an invalid filter type; '
                                 'choose on in ' + repr(FILTER_TYPES))
        elif (isinstance(filter, numbers.Integral) and
              not (0 <= filter < len(FILTER_TYPES))):
            raise ValueError(repr(filter) + ' is an invalid filter type')
        blur = ctypes.c_double(float(blur))
        if self.animation:
            self.wand = library.MagickCoalesceImages(self.wand)
            library.MagickSetLastIterator(self.wand)
            n = library.MagickGetIteratorIndex(self.wand)
            library.MagickResetIterator(self.wand)
            for i in xrange(n + 1):
                library.MagickSetIteratorIndex(self.wand, i)
                library.MagickResizeImage(self.wand, width, height,
                                          filter, blur)
            library.MagickSetSize(self.wand, width, height)
        else:
            r = library.MagickResizeImage(self.wand, width, height,
                                          filter, blur)
            library.MagickSetSize(self.wand, width, height)
            if not r:
                self.raise_exception()

if height is None:
            height = self.height
        if not isinstance(width, numbers.Integral):
            raise TypeError('width must be a natural number, not ' +
                            repr(width))
        elif not isinstance(height, numbers.Integral):
            raise TypeError('height must be a natural number, not ' +
                            repr(height))
        elif width < 1:
            raise ValueError('width must be a natural number, not ' +
                             repr(width))
        elif height < 1:
            raise ValueError('height must be a natural number, not ' +
                             repr(height))
        if self.animation:
            self.wand = library.MagickCoalesceImages(self.wand)
            library.MagickSetLastIterator(self.wand)
            n = library.MagickGetIteratorIndex(self.wand)
            library.MagickResetIterator(self.wand)
            for i in xrange(n + 1):
                library.MagickSetIteratorIndex(self.wand, i)
                library.MagickSampleImage(self.wand, width, height)
            library.MagickSetSize(self.wand, width, height)
        else:
            r = library.MagickSampleImage(self.wand, width, height)
            library.MagickSetSize(self.wand, width, height)
            if not r:
                self.raise_exception()

The ``reset_coords`` parameter.

        .. versionadded:: 0.1.8

        """
        if background is None:
            background = Color('transparent')
        elif not isinstance(background, Color):
            raise TypeError('background must be a wand.color.Color instance, '
                            'not ' + repr(background))
        if not isinstance(degree, numbers.Real):
            raise TypeError('degree must be a numbers.Real value, not ' +
                            repr(degree))
        with background:
            if self.animation:
                self.wand = library.MagickCoalesceImages(self.wand)
                library.MagickSetLastIterator(self.wand)
                n = library.MagickGetIteratorIndex(self.wand)
                library.MagickResetIterator(self.wand)
                for i in range(0, n + 1):
                    library.MagickSetIteratorIndex(self.wand, i)
                    library.MagickRotateImage(self.wand,
                                              background.resource,
                                              degree)
                    if reset_coords:
                        library.MagickResetImagePage(self.wand, None)
            else:
                result = library.MagickRotateImage(self.wand,
                                                   background.resource,
                                                   degree)
                if not result:
                    self.raise_exception()

top = abs_(top, self.height, 0)
        if width is None:
            right = abs_(right, self.width)
            width = right - left
        if height is None:
            bottom = abs_(bottom, self.height)
            height = bottom - top
        if width < 1:
            raise ValueError('image width cannot be zero')
        elif height < 1:
            raise ValueError('image width cannot be zero')
        elif (left == top == 0 and width == self.width and
              height == self.height):
            return
        if self.animation:
            self.wand = library.MagickCoalesceImages(self.wand)
            library.MagickSetLastIterator(self.wand)
            n = library.MagickGetIteratorIndex(self.wand)
            library.MagickResetIterator(self.wand)
            for i in xrange(0, n + 1):
                library.MagickSetIteratorIndex(self.wand, i)
                library.MagickCropImage(self.wand, width, height, left, top)
                if reset_coords:
                    library.MagickResetImagePage(self.wand, None)
        else:
            library.MagickCropImage(self.wand, width, height, left, top)
            self.raise_exception()
            if reset_coords:
                self.reset_coords()

def open_image(self, input_file):
        image = Image(file=input_file)
        image.wand = library.MagickCoalesceImages(image.wand)
        return image