我可以使用Python访问ImageMagick API吗？

I need to use ImageMagick as PIL does not have the amount of image functionality available that I am looking for. However, I am wanting to use Python.

我需要使用ImageMagick，因为PIL没有我正在寻找的图像功能。但是，我想使用Python。

The python bindings (PythonMagick) have not been updated since 2009. The only thing I have been able to find is os.system calls to use the command line interface but this seems clunky.

python绑定（PythonMagick）自2009年以来一直没有更新。我唯一能找到的是os.system调用使用命令行界面，但这看起来很笨重。

Is there any way to access the API directly using ctypes and conversions of some sort? As a last resort is there any other library out there that has the extensive amount of image editing tools like ImageMagick that I have looked over?

有没有办法直接使用某种类型的ctypes和转换来访问API？作为最后的手段，还有其他任何图书馆都有大量的ImageMagick图像编辑工具，我已经查看了吗？

3 个解决方案

#1

I would recommend using Wand (explanations follows).

我建议使用Wand（解释如下）。

I was looking for proper binding to ImageMagick library, that would:

我正在寻找与ImageMagick库的正确绑定，这将：

work error/problem free
工作错误/无问题
be regularly maintained and up to date
定期维护和更新
allow nice objective Python
允许很好的客观Python

But indeed python API (binding) has too many different (mostly discontinued) versions. After reading a nice historical overview by Benjamin Schweizer it has all become clear ~~(also see his github wiki)~~ :

但实际上python API（绑定）有太多不同的（大多数已停产）版本。在阅读了Benjamin Schweizer的精彩历史概述后，一切都变得清晰了（另见他的github wiki）：

GraphicsMagick
GraphicsMagick工具
PythonMagick - first implementation
PythonMagick - 第一次实现
PythonMagickWand/Achim Domma - first Wand - a CDLL implementation
PythonMagickWand / Achim Domma - 第一个Wand - 一个CDLL实现
PythonMagickWand/Ian Stevens
PythonMagickWand / Ian Stevens
MagickFoo - included in python-magickwand
MagickFoo - 包含在python-magickwand中
Wand/Hong Minhee - the latest project
Wand / Hong Minhee - 最新项目

Now Wand is just a (reduced) C API to the ImageMagick ".. API is the recommended interface between the C programming language and the ImageMagick image processing libraries. Unlike the MagickCore C API, MagickWand uses only a few opaque types. Accessors are available to set or get important wand properties." (See project homepage)

现在，Wand只是ImageMagick的一个（简化的）C API。.. API是C编程语言和ImageMagick图像处理库之间的推荐接口。与MagickCore C API不同，MagickWand仅使用几种不透明类型。可以使用访问器设置或获取重要的魔杖属性。“ （见项目主页）

So it is already a simplified interface that is easer to maintain.

因此，它已经是一个易于维护的简化界面。

#2

I found no good Python binding for ImageMagick, so in order to use ImageMagick in Python program I had to use subprocess module to redirect input/output.

我发现ImageMagick没有很好的Python绑定，所以为了在Python程序中使用ImageMagick，我不得不使用子进程模块来重定向输入/输出。

For example, let's assume we need to convert PDF file into TIF:

例如，假设我们需要将PDF文件转换为TIF：

path = "/path/to/some.pdf"
cmd = ["convert", "-monochrome", "-compress", "lzw", path, "tif:-"]
fconvert = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = fconvert.communicate()
assert fconvert.returncode == 0, stderr

# now stdout is TIF image. let's load it with OpenCV
filebytes = numpy.asarray(bytearray(stdout), dtype=numpy.uint8)
image = cv2.imdecode(filebytes, cv2.IMREAD_GRAYSCALE)

Here I used tif:- to tell ImageMagick's command-line utility that I want to get TIF image as stdout stream. In the similar way you may tell it to use stdin stream as input by specifying - as input filename.

在这里我使用tif： - 告诉ImageMagick的命令行实用程序，我想将TIF图像作为stdout流。以类似的方式，您可以通过指定 - 作为输入文件名来告诉它使用stdin流作为输入。

#3

This has worked for me for the following command to create an image from text for the letter "P":

这对我来说有用，可以通过以下命令从文本中为字母“P”创建图像：

import subprocess

cmd = '/usr/local/bin/convert -size 30x40 xc:white -fill white -fill black -font Arial -pointsize 40 -gravity South -draw "text 0,0 \'P\'" /Users/fred/desktop/draw_text2.gif'

subprocess.call(cmd, shell=True)

#1