improve patch according to reviewer's suggestion
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@ -439,11 +439,11 @@ class Escpos:
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img_rgba = Image.open(f)
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img = Image.new('RGB', img_rgba.size, (255,255,255))
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channels = img_rgba.split()
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kwargs = {}
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if len(channels) > 1:
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# use alpha channel as mask
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kwargs['mask'] = img_rgba.split()[3]
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img.paste(img_rgba, **kwargs)
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img.paste(img_rgba, mask=channels[3])
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else:
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img.paste(img_rgba)
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print 'convert image'
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