contactsmacos
I'm trying to find where this icon is located. I've looked through /Applications/Contacts.app's Assets.car file and it wasn't in there. I've also looked through /System/Library/CoreServices/CoreTypes.bundle and it's not in there either, though the base "human" image is in there, albeit in black.
Where might it be located?
I don't know how to dim inactive icons in the Dock. However, some people prefer the old-style two-dimensional dock that you can activate. It's certainly easier to discern which apps are open on this view.
To activate the 2D dock, open Terminal. Then type in the following command:
defaults write com.apple.dock no-glass -boolean YES
From there, you can log off & back on, and your Dock will have changed. If you ever need to revert this setting back run the above command again, but change the word YES for NO.
As far as I know, there's no image that you can change to change the background of the Dock. However, you can give the image to DockMod which will let you change the background.
Best Answer
The file is located in many, many different car files. Below is one of the car's and one pdf.
Inside the car files there are black silhouette pdfs. My guess is that inverts it (to white) and then adds the background.
Heres my attempt at recreating it: