[Python]croppic 裁剪图片的Python后台实现

import cStringIO
import io
import base64
from PIL import Image, ImageTk
def img_crop_to_file(request):
    #获取文件
    img_data = request.POST.get('imgUrl')
    ext = img_data.split('base64,')[0].split('/')[1].split(';')[0]
    img_data = img_data.split('base64,')[1]
    imgData = base64.b64decode(img_data)

    data_stream = cStringIO.StringIO()
    data_stream.write(imgData)
    source_image = Image.open(data_stream)

    #原始尺寸
    imgInitW = request.POST.get('imgInitW')
    imgInitH = request.POST.get('imgInitH')
    imgInitW,imgInitH = int(imgInitW),int(imgInitH)

    #调成后尺寸
    imgW = request.POST.get('imgW')
    imgH = request.POST.get('imgH')
    imgW,imgH = int(imgW),int(imgH)

    #偏移量
    imgY1 = request.POST.get('imgY1')
    imgX1 = request.POST.get('imgX1')
    imgY1,imgX1 = int(imgY1),int(imgX1)

    #裁剪框
    cropW = request.POST.get('cropW')
    cropH = request.POST.get('cropH')
    cropW,cropH = int(cropW),int(cropH)

    #旋转角度
    angle = request.POST.get('rotation')
    angle = int(angle)

    #创建新的图片
    source_image = source_image.resize((imgW,imgH))

    rotated_image = source_image.rotate(-float(angle))

    rotated_width,rotated_height = rotated_image.size

    dx = rotated_width - imgW
    dy = rotated_height - imgH

    cropped_rotated_image = Image.new('RGBA',(int(imgW),int(imgH)),0)
    a = rotated_image.crop((dx/2,dy/2,dx/2+imgW,dy/2+imgH))
    a.save('crop.jpeg')
    cropped_rotated_image.paste(rotated_image.crop((dx/2,dy/2,dx/2+imgW,dy/2+imgH)),(0,0,imgW,imgH))

    final_image = Image.new('RGBA',(int(cropW),int(cropH)),0)
    final_image.paste(cropped_rotated_image.crop((imgX1,imgY1,imgX1+cropW,imgY1+cropH)),(0,0,cropW,cropH))

    filename = str(uuid.uuid1())
    uuidname = '%s.%s' % (filename,ext)
    output_filename = os.path.join(os.path.join(MEDIA_ROOT,'images/topic_covers_processed/'),uuidname)
    print(output_filename)
    final_image.save(output_filename)
    return HttpResponse(json.dumps({'status':'success','url':'/pics/images/topic_covers_processed/%s' % uuidname}))