在json中保存PIL图像的最佳方法是什么 [英] what is the best way to save PIL image in json
问题描述
我正在尝试发送应该包含 Pillow 图像作为他的字段之一的 json dict，为此我必须将图像转换为字符串.我尝试使用枕头功能:image.toString()但仍然以字节的形式得到它，所以我尝试对其进行编码:
I'm trying to send json dict that should contain Pillow image as one of his fields, to do that I have to convert the image to string.
I tried to use pillow function:
image.toString()
but still got it as bytes, so I tried to encode it:
buff = BytesIO()
image.save(buff, format="JPEG")
img_str = base64.b64encode(buff.getvalue())
但仍然以字节的形式得到它.如何将 Pillow 图像转换为可以保存在 json 文件中的格式?
but still got it as bytes. How can I convert Pillow images to format that can be saved in json file?
推荐答案
在评论中，Mark Setchell 建议对 b64encode 的结果调用 .decode('ascii')代码>调用.我同意这会起作用，但我认为 base64encoding 开始引入了一个不必要的额外步骤，使您的代码复杂化.*
In the comments, Mark Setchell suggests calling .decode('ascii') on the result of your b64encode call. I agree that this will work, but I think base64encoding to begin with is introducing an unnecessary extra step that complicates your code.*
相反，我建议直接解码 image.tostring 返回的字节.唯一的复杂之处是字节对象可以包含大于 128 的值，因此您无法使用 ascii 对其进行解码.尝试使用可以处理高达 256 的值的编码，例如 latin1.
Instead, I suggest directly decoding the bytes returned by image.tostring. The only complication is that the bytes object can contain values larger than 128, so you can't decode it with ascii. Try using an encoding that can handle values up to 256, such as latin1.
from PIL import Image
import json
#create sample file. You don't have to do this in your real code.
img = Image.new("RGB", (10,10), "red")
#decode.
s = img.tobytes().decode("latin1")
#serialize.
with open("outputfile.json", "w") as file:
json.dump(s, file)
(*但是，令我惊讶的是，生成的 json 文件仍然比使用 latin1 编码制作的文件小，至少对于我的示例文件.使用您自己的判断来确定文件大小或程序清晰度是否更重要.)
(*but, to my surprise, the resulting json file is still smaller than one made with a latin1 encoding, at least for my sample file. Use your own judgement to determine whether file size or program clarity is more important.)
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