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Developing an application for Mac OS, sooner or later you’ll want to add an icon to it. And Mac OS uses Apple’s own format for application icons - Apple Icon Image format - files with
.icns
extension. But how does one create such a file?It is actually not so hard, but there are some tricky moments. I’ll cover those and as a bonus I’ll show you how to use
.icns
icon in Qt-based application (deadly simple).- Browse to find the desired.icns file and save it to your Desktop. Connect your device and wait for it to mount on the Desktop. Control+click on the device’s icon. Select Get Info. Move the Get Info window to a position that also allows you to see the.icns file downloaded earlier. Drag the.icns file to the icon on the top left corner.
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There is an out-of-the-box Mac OS tool for such conversion - iconutil (documentation for which is nowhere to find at Apple’s website, so this brief
man
page is all we have).Don’t provide app icons in ICNS or JPEG format. The ICNS format doesn’t support features like wide color gamut or deliver the performance and efficiency you get when you use asset catalogs. JPEG doesn’t support transparency through alpha channels and its compression can blur or distort an icon’s images.
However, you cannot just take a random PNG and feed it to
iconutil
. I mean, you can, but it will give you the following error:Because
iconutil
takes only specially named folders. Just how am I supposed to know about that? And it shows similar short and useless error messages for other things it doesn’t like. For example, here’s an output for the situation when files inside iconset folder are not named “properly” or have “wrong” dimensions:Go figure.
After a set of trials and browsing the internet I found out (hopefully) all the requirements:
- First you need to prepare a set of icon pictures and put those into a folder with
.iconset
“extension”, for examplesome.iconset
; - Pictures from this set should be named in a certain way and have specific dimensions.
Correct dimensions can be found in Apple Guidelines. So it’s 5 different dimensions, but actually 10 “physical” files as each dimension is represented twice (you’ll see why). And these files have to be named according to the following format:
So here’s the full list of proper filenames:
At the same time, I’ve got a commit to my script, and this commit adds more sizes, which supposedly solves some
missing size
error. I never got such an error, so even though I accepted the commit, I won’t add those changes to the article.Script to automate the process
But that’s rather boring to create all those files manually in some graphics editor, right? So let’s use sips utility (although, I recommend using ImageMagick, as it gives better quality results):
Better, but still - we have to run it 10 times. So let’s write a Python script for that:
The full script is published here.
As an example, I prepared a square picture with a resolution of 2048x2048 and 150 pixel per inch, so there is plenty room to prevent upscaling:
Pass picture path to the script like that:
The script will:
- Create a folder
~/Desktop/apple.iconset
; - Generate 10 files with different dimensions and save those into that folder;
- Call
iconutil
on this folder and put resultingapple.icns
to~/Desktop/
.
Here’s how the final
apple.icns
looks like in Preview:So everything from that folder is bundled into one file.
And now the bonus part - how to use
.icns
as an icon for a Qt-based application.As I said, it’s deadly simple: put
apple.icns
into your Qt project folder and add the following line into your-project.pro
:And that’s it:
Here are some of our popular icons for inspiration:
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