本文实例讲述了python使用PIL模块实现给图片打水印的方法。分享给大家供大家参考。具体实现方法如下:
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)) 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,'tile',0.5).show() watermark(im,'scale',1.0).show() watermark(im,(100,100),0.5).show() if __name__ == '__main__': test()
希望本文所述对大家的Python程序设计有所帮助。
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