PIL对上传到Django的图片进行处理并保存的实例

pic = request.FILES["picture"]# pic是 <class 'django.core.files.uploadedfile.InMemoryUploadedFile'> 类型的数据# 而pillow的Image.open("./xxx.jpg") 则是：<class 'PIL.JpegImagePlugin.JpegImageFile'> 类型的数据# 问题是如何把InMemoryUploadedFile转化为PIL类型，并且处理之后再转回InMemoryUploadedFile，并save

from PIL import Imagepic = request.FILES["picture"]im_pic = Image.open(pic)# 这样就把InMemoryUploadedFile转化为了PIL类型数据，pic是InMemoryUploadedFile，im_pic是PIL类型

w, h = im_pic.sizeif w >= h:  w_start = (w-h)*0.618  box = (w_start, 0, w_start+h, h)  region = im_pic.crop(box)else:  h_start = (h-w)*0.618  box = (0, h_start, w, h_start+w)  region = im_pic.crop(box)# region就是PIL处理后的正方形了

from io import BytesIOfrom django.core.files.uploadedfile import InMemoryUploadedFile// 先保存到磁盘iopic_io = BytesIO()region.save(pic_io, im_pic.format)// 再转化为InMemoryUploadedFile数据pic_file = InMemoryUploadedFile(  file=pic_io,  field_name=None,  name=pic.name,  content_type=pic.content_type,  size=pic.size,  charset=None)

from ./models import Picturep = Picture(picture=pic_file)p.save()