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When I was using PIL.Image.Image.rotate (expand=True) to make a
sequence of rotations to be joined later in a clip; but I found a
trouble: my object vibrates because the resulting vertex move around
the expected vertex. This is harmful for animations because you get
undesirable tremble. So I try the problem forcing the resulting surface
size to be odd in both dimentions, because the middle of these "odd"
surfaces is exactly a pixel, not a pixel given for rounding. Remember
that the middle of 1 2 3 4 5 6 7 8 9 clearly is 5, but the center of
1 2 3 4 is "somewhere" beetwen 2 and 3. I rewrite the "rotate" method: def rotate(self, angle, resample=NEAREST, expand=0): "Rotate image. Angle given as degrees counter-clockwise." if expand: import math angle = -angle * math.pi / 180 matrix = [ math.cos(angle), math.sin(angle), 0.0, -math.sin(angle), math.cos(angle), 0.0 ] def transform(x, y, (a, b, c, d, e, f)=matrix): return a*x + b*y + c, d*x + e*y + f # calculate output size w, h = self.size xx = [] yy = [] for x, y in ((0, 0), (w, 0), (w, h), (0, h)): x, y = transform(x, y) xx.append(x) yy.append(y) w = int(math.ceil(max(xx)) - math.floor(min(xx))) h = int(math.ceil(max(yy)) - math.floor(min(yy))) # adjust center x, y = transform(w / 2.0, h / 2.0) matrix[2] = self.size[0] / 2.0 - x matrix[5] = self.size[1] / 2.0 - y return self.transform((w, h), AFFINE, matrix) if resample not in (NEAREST, BILINEAR, BICUBIC): raise ValueError("unknown resampling filter") self.load() if self.mode in ("1", "P"): resample = NEAREST return self._new(self.im.rotate(angle, resample)) for this: def rotate(self, angle, resample=NEAREST, expand=0): "Rotate image. Angle given as degrees counter-clockwise." if expand: import math angle = -angle * math.pi / 180 matrix = [ math.cos(angle), math.sin(angle), 0.0, -math.sin(angle), math.cos(angle), 0.0 ] def transform(x, y, (a, b, c, d, e, f)=matrix): return a*x + b*y + c, d*x + e*y + f # calculate output size w0, h0 = w, h = self.size xx = [] yy = [] for x, y in ((0, 0), (w, 0), (w, h), (0, h)): x, y = transform(x, y) xx.append(x) yy.append(y) w = int(math.ceil(max(xx)) - math.floor(min(xx))) if w & 1== 0: w += 1 h = int(math.ceil(max(yy)) - math.floor(min(yy))) if h & 1== 0: h += 1 # adjust center x, y = transform(w / 2.0, h / 2.0) matrix[2] = w0 / 2.0 - x matrix[5] = h0 / 2.0 - y return self.transform((w, h), AFFINE, matrix) if resample not in (NEAREST, BILINEAR, BICUBIC): raise ValueError("unknown resampling filter") self.load() if self.mode in ("1", "P"): resample = NEAREST return self._new(self.im.rotate(angle, resample)) This really works I am using it now and no more Parkinson in my animations. Saludos, Jhonlier --
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