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I have a random .PNG file on my Mac. Actually I have about a hundred of them. What is the easiest way to get the pixel dimensions? (I.e, 100 pixels wide and 50 high, or whatever).

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Doesn't that just show up when you view the file properties? –  tjameson Apr 20 '11 at 2:39
I right click, then click "Get info", and don't see it. –  William Jockusch Apr 20 '11 at 2:40

4 Answers 4

up vote 19 down vote accepted

In Terminal, you can use the following:

$ sips -g pixelWidth Pictures/238337225.png 
  pixelWidth: 1140
$ sips -g pixelHeight Pictures/238337225.png 
  pixelHeight: 900

To extract the value only, use e.g.

$ sips -g pixelHeight Pictures/238337225.png | tail -n1 | cut -d" " -f4

To embed that in AppleScript:

set h to do shell script "sips -g pixelHeight /Users/danielbeck/Pictures/238337225.png | tail -n1 | cut -d' ' -f4"
set w to do shell script "sips -g pixelWidth /Users/danielbeck/Pictures/238337225.png | tail -n1 | cut -d' ' -f4"
display alert "Height: " & (h as text) & "
Width: " & (w as text)


enter image description here

Alternatively, you can read the Spotlight metadata:

mdls Pictures/238337225.png | grep kMDItemPixel
kMDItemPixelCount              = 1026000
kMDItemPixelHeight             = 900
kMDItemPixelWidth              = 1140

To get the names and dimensions of all files in a directory:

$ mdls Pictures/* | grep "\(kMDItemDisplayName\|mMDItemPixel\)"
kMDItemDisplayName             = "url.png"
kMDItemPixelCount              = 16384
kMDItemPixelHeight             = 128
kMDItemPixelWidth              = 128

Or alternatively, using find and sips:

find /Users/danielbeck/Pictures -type f -name "*.png" -exec sips -g pixelWidth {} \; -exec sips -g pixelHeight {} \;

More more flexibility, wrap in a shell script:

$ cat dim.sh 
#!/usr/bin/env bash


if [ ! -f "$filename" ] ; then
    echo "$filename not found!";
    exit 1

h=$( mdls "$filename" | grep kMDItemPixelHeight | tail -n1 | cut -d= -f2 )
w=$( mdls "$filename" | grep kMDItemPixelWidth | tail -n1 | cut -d= -f2 )

osascript -e "tell application \"Finder\" to {activate, display alert \"$filename\\nWidth:$w\\nHeight:$h\"}"

Result after chmod +x dim/sh:

$ ./dim.sh Pictures/flying_cars.png

enter image description here

You could easily extend the script to display dimensions for multiple files at once, or e.g. all png files in a certain directory. Output is as Finder dialog, so you can embed it into an Automator service:

Open Automator and select to create a Service that receives image files as input in any application.

Add a Run Shell Script action that receives input as arguments and enter the following:

for f in "$@"
    h=$( mdls "$f" | grep kMDItemPixelHeight | tail -n1 | cut -d= -f2 )
    w=$( mdls "$f" | grep kMDItemPixelWidth | tail -n1 | cut -d= -f2 )
    dlg="$dlg$f\nW:$w H:$h\n"
osascript -e "tell application \"Finder\" to {activate, display alert \"$dlg\"}"
exit 0

Save as Show Image Dimensions. Select a few image files in Finder and select Finder » Services » Show Image Dimensions or Right-click on one of the files and [Services »] Show Image Dimensions

enter image description here

enter image description here

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Wow +1 ... can't get much better detail than that! Need to write a bash script and you basically did it all for me already! Awesome! –  jsherk Jul 28 '12 at 4:31
Wow. the find with sips example was exactly what I needed. Thanks! –  br1ckb0t Jan 21 at 18:52

Find the file in a Finder window, and either:

  • Highlight the file and press ⌘ Cmd + ⌥ Option + I, or

  • Control-click the file and hold ⌥ Option so you can select "Show Inspector".

This will open an inspector which is similar to the Get Info window, but updates each time you select a file.

Now expand the "More info" section on the inspector. You will be able to see the PNG's dimensions and color depth, among other data. Select a new file to see its dimensions in the inspector.

An inspector window showing the highlighted file in a Finder window

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The weird thing is that when I open that window, what I see under "more info" is Title, Headline, and Last Opened . . . but no dimensions, color space, color profile, or alpha channel. My OS is 10.6.7 and my Finder is version 10.6.8; could that be the problem? –  William Jockusch Apr 20 '11 at 5:24
This feature depends on Spotlight to index the image's location. Are the picture in a non-indexed location? –  Stephen Jennings Apr 20 '11 at 6:45

The easiest way; open the images in Safari.

Select all the images. Then use Ctrl+Click context menu and choose Open With > Safari.

Optionally you can merge all the open Safari menus together into separate tabs using the Safari menu Window > Merge All Windows.

The top of the Safari window displays the image dimensions: enter image description here

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I find it really bizarre that this is the only option that worked for me. Why do I have to open a browser to view picture dimensions ?!? This is ridiculous. Thanks for the answer nevertheless –  Michael May 7 at 22:22

Not sure if you want to do it manually but this is a great tool that will give you the dimensions of any image: http://www.pascal.com/software/freeruler/

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