python黑色背景rbg_PIL图像转换为RGB 保存为纯黑色图像（python）

我有图像，我想保存在jpeg格式，剪切和编辑后。在

这是我在python中的函数：import numpy as np

from skimage import data, io, filter, color, exposure

import skimage.transform as tf

from skimage.transform import resize, rescale, rotate, setup, warp, AffineTransform

import os

from os import listdir

from os.path import isfile, join

from PIL import Image

def generateHoGSamples(path, readfile):

print "generating samples from " + path+"\\"+readfile

img = color.rgb2gray(io.imread(path+"\\"+readfile))

img = resize(img, (50,100))

filename = os.path.splitext(readfile)[0]

angles = [3, 0, -3]

shears = [0.13, 0.0, -0.13]

imgidx = 0

for myangle in angles:

myimg = rotate(img, angle=myangle, order=2)

for myshear in shears:

imgidx+=1

afine_tf = tf.AffineTransform(shear=myshear)

mymyimg = tf.warp(myimg, afine_tf)

outputimg = Image.fromarray(mymyimg)

# Saving as "jpg" without the following line caused an error

outputimg = outputimg.convert('RGB')

outputimg.save(path+"//"+str(imgidx)+".jpg", "JPEG")

但结果是所有的图像都是黑色的。

这是怎么回事？在