Python PIL:如何将PNG图像写入字符串 [英] Python PIL: how to write PNG image to string

问题描述

我已经使用 PIL 生成了图像.如何将其保存到内存中的字符串中? Image.save()方法需要一个文件.

I have generated an image using PIL. How can I save it to a string in memory? The Image.save() method requires a file.

我想在词典中存储几张这样的图像.

I'd like to have several such images stored in dictionary.

推荐答案

您可以使用 BytesIO 类以获取行为类似于文件的字符串的包装. BytesIO对象提供与文件相同的接口，但是将内容仅保存在内存中

You can use the BytesIO class to get a wrapper around strings that behaves like a file. The BytesIO object provides the same interface as a file, but saves the contents just in memory:

import io

with io.BytesIO() as output:
    image.save(output, format="GIF")
    contents = output.getvalue()

您必须使用format参数明确指定输出格式，否则PIL在尝试自动检测时会引发错误.

You have to explicitly specify the output format with the format parameter, otherwise PIL will raise an error when trying to automatically detect it.

如果您从文件加载图像，则该图像具有 format 参数包含原始文件格式，因此在这种情况下，您可以使用format=image.format.

If you loaded the image from a file it has a format parameter that contains the original file format, so in this case you can use format=image.format.

在引入io模块之前的旧Python 2版本中，您应该使用 StringIO 模块.

In old Python 2 versions before introduction of the io module you would have used the StringIO module instead.

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