From smithmw7 on the HTML5 Game Devs Forum: "I have started work on Photoshop script that exports layer data to a JSON file that can be imported at runtime by Phaser to recreate the design using images from a sprite sheet. This is still work in progress as I will be cleaning this up and adding more features such as bitmap text support and animated spritesheets. Add separation from the design from the game code. No more manually placing images. Make changes in Photoshop and see them right away in the running game."