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【Python】 python使用PIL给图片加水印

作者:Dezai.CN / 发布于2013/7/13/ 869


	import Image, ImageEnhance

	def reduce_opacity(im, opacity):
	 """Returns an image with reduced opacity."""
	 assert opacity >= 0 and opacity <= 1
	 if im.mode != 'RGBA':
	 im = im.convert('RGBA')
	 else:
	 im = im.copy()
	 alpha = im.split()[3]
	 alpha = ImageEnhance.Brightness(alpha).enhance(opacity)
	 im.putalpha(alpha)
	 return im

	def watermark(im, mark, position, opacity=1):
	 """Adds a watermark to an image."""
	 if opacity < 1:
	 mark = reduce_opacity(mark, opacity)
	 if im.mode != 'RGBA':
	 im = im.convert('RGBA')
	 # create a transparent layer the size of the image and draw the
	 # watermark in that layer.
	 layer = Image.new('RGBA', im.size, (0,0,0,0))
	 if position == 'tile':
	 for y in range(0, im.size[1], mark.size[1]):
	 for x in range(0, im.size[0], mark.size[0]):
	 layer.paste(mark, (x, y))
	 elif position == 'scale':
	 # scale, but preserve the aspect ratio
	 ratio = min(
	 float(im.size[0]) / mark.size[0], float(im.size[1]) / mark.size[1])
	 w = int(mark.size[0] * ratio)
	 h = int(mark.size[1] * ratio)
	 mark = mark.resize((w, h))
	 layer.paste(mark, ((im.size[0] - w) / 2, (im.size[1] - h) / 2))
	 else:
	 layer.paste(mark, position)
	 # composite the watermark with the layer
	 return Image.composite(layer, im, layer)

	def test():
	 im = Image.open('test.png')
	 mark = Image.open('overlay.png')
	 watermark(im, mark, 'tile', 0.5).show()
	 watermark(im, mark, 'scale', 1.0).show()
	 watermark(im, mark, (100, 100), 0.5).show()

	if __name__ == '__main__':
	 test()

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