What would be interesting would be to take a high resolution image, then downsample it to pixelate the stars. Then go back to the original image, shift it by a pixel by a rotation in one or both directions, and downsample it again. If you were really ambitious and had the right software, you could do a nice animation by rotating the high resolution image randomly and down sampling. This would illustrate dithering and you could explain how you can get better resolution by dithering and drizzling. All drizzling does, simplistically, is somewhat make up for the shortcomings of having discrete pixels when your actual optical image has better spatial resolution than your sensor (the horrible undersampling - shudder!)
Edit: I meant "rotation" in the sense of moving all pixels to the right or left or up or down, not actually rotating in the image by some angle. Sorry, I was in my image-analysis frame of mind.
Edited by johnsoda, 11 February 2019 - 01:11 PM.