IT&Enginnering AA - Transparent Background Images Generation with Photoshop

Part 1: Photoshop 

Create scratch sprite with transparent background
Learn to use photoshop to remove the monochrome (with only one color) background and save the images in transparent background PNG format.

(If you want to work at home and don't have photoshop, please go to http://apps.pixlr.com/editor/)

Part 2: Repeat: Architecture

Part 3: Repeat: Scratch background scrolling