使用Python/PIL的多边形裁剪/剪辑 [英] Polygon crop/clip using Python / PIL

问题描述

多边形点与未切割的原始图像一起由客户端发送到服务器.

The polygon points along with the uncut, original image are sent by client to the server.

有没有一种方法可以沿着这些点在Python服务器中裁剪(裁剪)原始图像，并保存裁剪后的图像? 我目前正在使用PIL，并且希望使用PIL或PIL扩展解决方案.

Is there a way that I can clip (crop) the original image along these points in Python server, and save the cropped image? I am currently using PIL, and would prefer a PIL or PIL extended solution.

预先感谢

推荐答案

我找到了一个使用numpy和PIL的解决方案，因此我想与大家分享:

I found a solution using numpy and PIL- so thought I will share:

import numpy
from PIL import Image, ImageDraw

# read image as RGB and add alpha (transparency)
im = Image.open("crop.jpg").convert("RGBA")

# convert to numpy (for convenience)
imArray = numpy.asarray(im)

# create mask
polygon = [(444,203),(623,243),(691,177),(581,26),(482,42)]
maskIm = Image.new('L', (imArray.shape[1], imArray.shape[0]), 0)
ImageDraw.Draw(maskIm).polygon(polygon, outline=1, fill=1)
mask = numpy.array(maskIm)

# assemble new image (uint8: 0-255)
newImArray = numpy.empty(imArray.shape,dtype='uint8')

# colors (three first columns, RGB)
newImArray[:,:,:3] = imArray[:,:,:3]

# transparency (4th column)
newImArray[:,:,3] = mask*255

# back to Image from numpy
newIm = Image.fromarray(newImArray, "RGBA")
newIm.save("out.png")

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