Developer Pictures
In some of the Jak and Daxter games, there are hidden pictures of the game developers.
Jak and Daxter: The Precursor Legacy
In Jak and Daxter: The Precursor Legacy, there is a texture file called fin-leafygroundBACKdirt.png
in the finalboss-vis-tfrag
textures folder which contains a hidden face baked into the image. The texture repeatedly appears in the mountainous landscape surrounding the dark eco silo at the final boss fight. It is difficult to see during the final boss fight since everything is dark and purple, but it is easily viewable from the silo after completing the boss fight as the weather returns to normal.
The true identity of who the face belongs to is unknown, but it is theorized that it's the face of Adam Marquis, who was a texture and shader artist at Naughty Dog who worked on the game.
Jak II
A picture of development team members can be found hidden in Jak II. It can be found in a corner near the green security gate. The photo is titled city-back-room-01.png
and can be found in the ctygenb-vis-tfrag
folder.
The developers in the photo are (from upper left going clockwise) Tate Mosessian, Bruce Straley, Adam Marquis, Simon Craghead, Rob Adams, Erick Pangilinan, and Don Poole. These were most of the developers that worked on creating the world environments in the game. The photo was put into the game as an easter egg by Rob Adams.