python Image PIL到二进制Hex

Question

from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
import urllib.request
import io
import binascii

data = urllib.request.urlopen('http://pastebin.ca/raw/2311595').read()
r_data = binascii.unhexlify(data)
stream = io.BytesIO(r_data)
img = Image.open(stream)
draw = ImageDraw.Draw(img)
font = ImageFont.truetype("arial.ttf",14)
draw.text((0, 220),"This is a test11",(0,255,0),font=font)
draw = ImageDraw.Draw(img)

with open(img,'rb') as in_file: #error on here invalid file:
     hex_data = in_file.read()
# Unhexlify the data.
bin_data = binascii.unhexlify(bytes(hex_data))
print(bin_data)

题

将十六进制转换为图像并在图像上绘制文本,之后将图像转换为二进制十六进制,但在这里遇到问题with open(img,'rb') as in_file:,如何将img转换为十六进制？

Answer 1

该img对象需要再次保存; 把它写到另一个BytesIO对象:

output = io.BytesIO()
img.save(output, format='JPEG')

然后用.getvalue()方法获取书面数据:

hex_data = output.getvalue()

PIL-for-python-3景观目前相当混乱.该枕头叉看起来是最好的,保持版本在那里的时刻.它包含一些修复程序,可以保存BytesIO对象的工作.如果io.UnsupportedOperation: fileno使用上面的代码遇到异常,那么您的版本尚未修复,在这种情况下,您将不得不求助于使用临时文件.