python使用PIL制作水印,pythonpil水印,利用python的PIL
python使用PIL制作水印,pythonpil水印,利用python的PIL
利用python的PIL库制作一个水印Image,支持颜色,贴图,缩放和减少透明
[Python]代码
import Image, ImageEnhancedef 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 imdef 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()
相关内容
- python生成验证码(webpy完整验证码类),pythonwebpy,python生成
- python小数除法取整数部分,python小数除法整数,python中的
- python获得url的顶级域名,pythonurl顶级域名,如下代码to
- python使用ctypes模块调用windowsapi获取系统版本,ctypeswi
- python解决约瑟夫环问题,python约瑟夫环,100人围成一圈,
- python统计代码行数代码,python统计行数,[Python]代码#实
- 原创Python数代码行数代码,原创python代码行数,如下py
- Python逐块读取大文件行数的代码,python逐行数代码,py
- python二分查找,python二分,python二分查找[P
- python实现的堆排序算法代码,python堆排序算法,def heap
评论关闭