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fix #501 #768

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fix #501 #768

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8 changes: 8 additions & 0 deletions wordcloud/wordcloud.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1033,6 +1033,14 @@ def _draw_contour(self, img):
contour = np.array(contour) > 0
contour = np.dstack((contour, contour, contour))

# img is RGBA but the contour is RGB
if img.mode == 'RGBA' and contour.shape[2] == 3:
# RGB dims are equal, i.e., [:, :, 0] == [:, :, 1] == [:, :, 2]
# duplicate a color dimension and append to be a new alpha
alpha = contour[:, :, -1]
alpha = alpha.reshape((contour.shape[0], contour.shape[1], 1))
contour = np.concatenate((contour, alpha), axis=2)

# color the contour
ret = np.array(img) * np.invert(contour)
if self.contour_color != 'black':
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