A suggestion for people enquiring about obtaining the images used in these tutorials: pause a video at an appropriate point and use a snapshot tool such as Snaps Pro or SnagIt (on a Mac) to take a screen snapshot of the image before it's modified and save the snapshot locally.
A 2nd suggestion: having an aged and decayed memory, I often find it useful to replay parts of these videos. For convenience, and to avoid burning through my data cap, I download such videos. (I use Downie, again on the Mac, but there are many others.)
