png(5) on macOS
The text 2aaee927c23d, as Mac OS X 10.6.4, Mac OS X 10.6.3, Mac OS X 10.6.2, Mac OS X 10.6.1, Mac OS X 10.6, Mac OS X 10.5.4, Mac OS X 10.5.3 shipped it.
Portable Network Graphics (PNG) format
The text 2aaee927c23d, as Mac OS X 10.6.4, Mac OS X 10.6.3, Mac OS X 10.6.2, Mac OS X 10.6.1, Mac OS X 10.6, Mac OS X 10.5.4, Mac OS X 10.5.3 shipped it.
Portable Network Graphics (PNG) format