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Why Do ImageMagick Commands Work in CMD but Fail in PowerShell?

Barbara Streisand

Oct 26, 2024 am 08:58 AM

Why Do ImageMagick Commands Work in CMD but Fail in PowerShell?

ImageMagick Commands Not Executing in PowerShell Window but Running in CMD Window

Problem:

An ImageMagick command for adding a watermark to an image fails to execute in PowerShell while running successfully in CMD.

Cause:

The command uses special characters that can be interpreted differently by different shells (e.g., bash, CMD32, PowerShell).

Solution:

Quoting and Shell Syntax:

Bash: Escape parentheses with backslashes and put hashes inside quotes.

CMD32: Use carets for escaping and double up percent signs.

Powershell: Escape parentheses with backticks.

Escaping Techniques:

Shell	Escape Character	Line Continuation
Bash	Backslash	Backslash
CMD32	Caret ^	Caret ^
PowerShell	Backtick `	Backtick `

Example Commands:

Bash:

<code class="sh">magick IMAGE1.PNG \
   \( IMAGE2.PNG -resize 50% -fill '#ff0000' -colorize 100% \) \
  -composite -transparent 'hsl(40,50,60)' result.png</code>

CMD32:

magick IMAGE1.PNG ^
   ( IMAGE2.PNG -resize 50%% -fill "#ff0000" -colorize 100% ) ^
  -composite -transparent "hsl(40,50,60)" result.png

Powershell:

magick IMAGE1.PNG `
   `( IMAGE2.PNG -resize 50% -fill "#ff0000" -colorize 100% `) `
  -composite -transparent "hsl(40,50,60)" result.png

Cross-Platform Solution:

To avoid shell-specific quoting issues, use ImageMagick's "-script" option to read commands from a file:

<code class="sh">magick -script script.mgk</code>

Script File (script.mgk):

-size 640x480 xc:#ffff00
( foreground.png -resize 50% )
-gravity center -composite -write result.png

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