如何在ImageMagick中使用带标题的标准输入 [英] How to use stdin with caption in ImageMagick

问题描述

通过阅读有关文字的

但是在Ubuntu 16.04 LTS上，相同的命令不起作用，使用 convert 版本：ImageMagick 6.8.9-9 Q16 x86_64 2016-06-01。事实上，它实际上是渲染stdin算子。

我唯一能够在Google上远程查找这个问题的内容是这篇文章，可追溯到2015年10月，其中修补了ImageMagick 6.9.2-5 Beta修复类似问题。

问题：我没有正确地逃避它，是否在ImageMagick中确实存在问题，或者我的Linux发行版是否收到了带有错误的ImageMagick的历史版本，我需要从源码构建？

许多实验后很久

已解决......？已建立ImageMa从Ubuntu框上的源代码中获取gick 7.0.2，上面的命令可以正常工作。有没有更好的解决方案？

解决方案

无需从源代码构建。只需用`tee`替换@ - ：

  printfHello \\\
World| 
兑换\ 
 -size 1280x100 \ 
 -background'＃0000FF10'\ 
 -density 90 \ 
 -gravity Center \ 
 -fill black \ 
 -font Helvetica \ 
标题：`tee`\ 
 test.png 
  

`tee`将在完成转换命令之前先执行'process'stdin。

My understanding from reading the ImageMagick documentation regarding text, is that the @- notation reads the contents of standard input.

As such, this should be a fairly straight forward way to render Hello World.

printf "Hello\nWorld" | 
convert \
  -size 1280x100 \
  -background '#0000FF10' \
  -density 90 \
  -gravity Center \
  -fill black \
  -font Helvetica \
  caption:@- \
  test.png

On OS X 10.11.5 via HomeBrew, this works, using convert Version: ImageMagick 6.9.4-3 Q16 x86_64 2016-05-20.

However on Ubuntu 16.04 LTS, the identical command does not work, using convert Version: ImageMagick 6.8.9-9 Q16 x86_64 2016-06-01. In fact, it renders the stdin operator, literally.

The only thing I was able to find that remotely looked like this problem on Google was this article, dated back in Oct 2015 in which ImageMagick 6.9.2-5 Beta was patched to fix a similar problem.

QUESTION: Am I not escaping it properly, is there really a problem in ImageMagick, or is my Linux Distro picking up a historical version of ImageMagick with the bug and I need to build from source?

Much Later After Many Experiments

SOLVED ...? Built ImageMagick 7.0.2 from source on the Ubuntu box and the above command worked as desired. Was there a better solution?

解决方案

No need to build from source. Just replace @- with "`tee`" :

printf "Hello\nWorld" | 
convert \
  -size 1280x100 \
  -background '#0000FF10' \
  -density 90 \
  -gravity Center \
  -fill black \
  -font Helvetica \
  caption:"`tee`" \
  test.png

`tee` will execute first and 'process' stdin before completing the convert command.

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