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Re: Get the actual width/height of an image

From: Emanuel Berg
Subject: Re: Get the actual width/height of an image
Date: Mon, 14 Sep 2020 22:52:59 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

Yuan Fu wrote:

> There doesn’t seem to be a function to get the
> aspect ratio of the image, or the actual pixel
> height/width of the image. So can I get
> this information?

For everything batch and graphics, use ImageMagick.

For the specific problem, you can use the command
identify(1) which is part of ImageMagick.

  $ identify zhanna-friske.png 
  zhanna-friske.png PNG 1280x720 1280x720+0+0 8-bit sRGB 835952B 0.000u 0:00.000

You can then parse the output to answer an even more
specific question, e.g. what the height is:

  #! /bin/zsh
  pic-height () {
      local img=$1
      identify $img | awk '{print $3}' | cut -d 'x' -f 2

  $ pic-height zhanna-friske.png 

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