There are two settings for you to choose. First, quality, is the color quality as a percentage (from 0-100%). The second option is "res", or the resolution -- The larger it is, the fewer pixels the output will be. After you select these two options, just click anywhere else on the screen, and it will start scanning! The is the main difference between this and other scanners is the color quality -- The lower the quality, the fewer the colors, but it becomes exponentially faster the lower the number (or, more accurately, it becomes exponentially slower the larger the number). A color quality of 25% was 5x faster than a color quality of 50% in a test.
Check out @mathman05's remix, which scans much, much faster on higher color qualities! https://scratch.mit.edu/projects/498208677 The thumbnail was intended to show off that this isn't normal image scanning, though the settings used for quality could be done even lower and still be considered "okay" in many cases. The thumbnail was rendered at a resolution of 1 (a 480x360 pixel image) and a quality of 11, taking 10.413 seconds to render. (Note that 10.413 seconds may be faster than normal speed as my laptop was plugged in) Images with few artifacts often look far better -- The image was a JPEG so that wasn't the case for mine. As common with new "tools" of mine (or ones remade from others) this can be used with credit -- I'm interested to see how people will use this if they do :) (Note: This does work with a camera by setting the video transparency)