如何在树莓派上安装支持 JPEG 的 PIL?

问题描述

我尝试在我的树莓派上安装 PIL 并读取 JPEG 文件.但是，它不是开箱即用的.

I tried to install PIL on my raspberry pi and read JPEG files. However, it does not work out of the box.

当我运行以下命令时:

sudo pip install pil

我在尝试打开图像时收到以下错误:

I receive the following error, trying to open an Image:

""decoder jpeg not available""

在尝试安装所有需要的 JPEG 库时，我遇到了一些错误，例如:

While trying to install all needed JPEG libraries I ran into some errors e.g.:

sudo apt-get install libjpeg
E: Unable to locate package libjpeg

推荐答案

您必须重新安装 PIL 并安装所需的库以及手动链接它们.此答案基于 this用于常规 ubuntu PIL 安装的博客文章和此askubuntu 问题，其中解释了如何编译 jpeg 编码:

You have to re-install PIL and also install the needed libraries as well as link them manually. This answer is based on this blog post for a regular ubuntu PIL installation and this askubuntu question, where it is explained how to compile the jpeg encoding:

### uninstall PIL
sudo pip uninstall pil

### download and compile the JPEG library
wget http://www.ijg.org/files/jpegsrc.v8c.tar.gz
tar xvfz jpegsrc.v8c.tar.gz
cd jpeg-8c
./configure --enable-shared --prefix=$CONFIGURE_PREFIX
make
sudo make install

### link the libraries correctly - RASPBERRY PI ONLY
sudo ln -s /usr/lib/arm-linux-gnueabi/libjpeg.so /usr/lib
sudo ln -s /usr/lib/arm-linux-gnueabi/libfreetype.so /usr/lib
sudo ln -s /usr/lib/arm-linux-gnueabi/libz.so /usr/lib

### install rest of the libraries, as well as freetrype and zlib
sudo apt-get install libjpeg-dev libfreetype6 libfreetype6-dev zlib1g-dev

### re-install PIL
sudo pip install pil

希望对某人有所帮助！

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