@zkvvoob have you been able to change your dock icon yet?
What @democrite mentioned above works. I'm currently running macOS Ventura 13.5.1 with Calibre 6.25.0.
I know @kovidgoyal has suggested overriding the icons using calibre configuration folder and creating .png files under a 'resources/images' folder. This approach will work for the other icons inside calibre app but not the dock icon.
In case there are other macOS users who are trying to change their dock icon, here are the steps to get this to work.
1. After you download or create a calibre.icns file, convert the .icns to a .png format (can Google for online converter) to 1024 x 1024 pixels.
2. Rename the file to 'library.png'. Then navigate to 'calibre.app/Contents/Resources/resources/images/' folder and copy the new file to that location to replace the original png. You can ignore the 'lt.png' file, it does not affect the dock icon image.
Keep in mind that every time you update calibre app with a new version the dock image will be overwritten with the original image file. So you'll have to update it manually or create a zshell script to copy the new png dock image over. Hope that helps!
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