Eclipse: Graphics Initialization, Buffered Images & Rasters

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He goes through some discussion of color and uses this web site: www.colorpicker.com
He also goes through some setup in Preferences  Just know that these computers will probably not remember changes to the Preferences, but here's the screen he goes to:

Finally, he is explaining what a "raster" image is -- even though it sounds like he's saying Rasta.  :)  Just know that a raster image is made up of a bunch of different colored squares (called pixels):

When you look at a raster graphic close up, you will see the pixelization much more clearly.  Some graphics [called vectors] are drawn mathematically with lines/curves, but it's really the difference between a photo and a cartoon at this point.