Note that you want no pixellation effects when image features are at the limit of your visual acuity. So you want the pixels to be 3-5 times smaller than you ca

Note that you want no pixellation effects when image features are at the limit of your visual acuity. So you want the pixels to be 3-5 times smaller than you can see. To demonstrate: draw a pair of vertical black lines 1px wide, with 1px white space between them. Then, tilt them at 30° or 45°. (Or, draw a pair of circles that are 1px thick and have 1px between them at the top, bottom, and sides; then look at various other positions.) Then try the same thing with a line and space thickness of 3px and 5px. See also: https://en.wikipedia.org/wiki/Moir%C3%A9_pattern https://en.wikipedia.org/wiki/Moir%C3%A9_pattern