从 python 运行 imagemagick convert(控制台应用程序)

2022-01-18 00:00:00 python python-3.x subprocess imagemagick imagemagick-convert

问题描述

我正在尝试使用 imagemagick 对一些字体进行光栅化，该命令在终端上运行良好:

I am trying to rasterize some fonts using imagemagick with this command which works fine from a terminal: 

convert -size 30x40 xc:white -fill white -fill black -font "fontsHelvetica Regular.ttf" -pointsize 40 -gravity South -draw "text 0,0 'O'" draw_text.gif

使用子进程自动运行相同的命令不起作用:

Running the same command using subprocess to automate it does not work:

try:
    cmd= ['convert','-size','30x40','xc:white','-fill','white','-fill','black','-font','fontsHelvetica Regular.ttf','-pointsize','40','-gravity','South','-draw',"text 0,0 'O'",'draw_text.gif']
    #print(cmd)
    subprocess.check_output(cmd,shell=True,stderr=subprocess.STDOUT)
except CalledProcessError as e:
    print(e)
    print(e.output)

.

Command '['convert', '-size', '30x40', 'xc:white-fill', 'white', '-fill', 'black', '-font', 'fonts\Helvetica Regular.ttf', '-pointsize', '40', '-gravity', 'South', '-draw', "text 0,0 'O'", 'draw_text.gif']' returned non-zero exit status 4
b'Invalid Parameter - 30x40
'

解决方案

我想通了:原来windows在PATH<中有自己的convert.exe程序/code>.

I figured it out: It turns out that windows has its own convert.exe program in PATH.

以下代码打印 b'C:\Windows\System32\convert.exe ':

The following code prints b'C:\Windows\System32\convert.exe ':

try:
    print(subprocess.check_output(["where",'convert'],stderr=subprocess.STDOUT,shell=True))
except CalledProcessError as e:
    print(e)
    print(e.output)

在终端中运行相同的代码表明 imagemagick 的 convert 会影响 Windows 的 convert:

Running the same code in a terminal shows that imagemagick's convert shadows Windows' convert:

C:UsersNavin>where convert                                                    
C:Program FilesImageMagick-6.8.3-Q16convert.exe                              
C:WindowsSystem32convert.exe

.

安装 ImageMagick 后我没有重新启动 python，所以它的 PATH 仍然指向 Windows 版本.

I did not restart python after installing ImageMagick so its PATH still pointed to the Windows version.

使用完整路径有效:

try:
    cmd= ['C:Program FilesImageMagick-6.8.3-Q16convert','-size','30x40','xc:white','-fill','white','-fill','black','-font','fontsHelvetica Regular.ttf','-pointsize','40','-gravity','South','-draw',"text 0,0 'P'",'draw_text.gif']
    print(str.join(' ', cmd))
    print('stdout: {}'.format(subprocess.check_output(cmd,shell=True,stderr=subprocess.STDOUT)))
except CalledProcessError as e:
    print(e)
    print(e.output)

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