如何将PIL Image.image对象转换为base64字符串？

Question

我试图以90度的角度旋转base64编码的图像。完成此操作后，我想将其转换回base64字符串。但不幸的是无法实现这一目标。

到目前为止，这是我所做的：

image_string = StringIO(base64.b64decode(base64_string_here))
image = Image.open(image_string)
angle = 90
rotated_image = image.rotate( angle, expand=1 )

Kindy帮我如何将Rotated_image转换为base64字符串。

这dir()是rotated_image的：

[‘Image__transformer’，’__ doc __’，’__ getattr __’，’__ init __’，’__ module
‘，’ repr __’，’
copy’，’ dump’，’ expand’，’ makeself’，’
new’，’category’，’
convert’，’copy’，’crop’，’draft’，’filter’，’format’，’format_description’，’fromstring’，’getbands’，’getbbox’，’getcolors’，’getdata’，’getextrema’
，“ getim”，“ getpalette”，“ getpixel”，“ getprojection”，“ histogram”，“ im”，“
info”，“ load”，“ mode”，“ offset”，“ palette”，“ paste”，“点”，“ putalpha”，“
putdata”，“ putpalette”，“
putpixel”，“量化”，’readonly’，’resize’，’rotate’，’save’，’seek’，’show’，’size’，’split’，’tell’，’thumbnail’，’tobitmap’，’tostring’，’transform’
‘，’转置’，’验证’]

Answer 1

Python 3

import base64
from io import BytesIO

buffered = BytesIO()
image.save(buffered, format="JPEG")
img_str = base64.b64encode(buffered.getvalue())

Python 2

import base64
import cStringIO

buffer = cStringIO.StringIO()
image.save(buffer, format="JPEG")
img_str = base64.b64encode(buffer.getvalue())