Does increasing an image’s size increase the dot density or size? Or does it cause the resolution to just decrease?
The SM prints at the same resolution unless you change the density setting. If you lower the density setting you will lower the resolution of the SM.
I seem to remember somebody had figured out the resolution of the SM was somewhere around the equivalent of 230 dpi on an inkjet or laser printer
Now if you enlarge the image enough so that the dpi of the image is below the dpi of the SM, then the resolution will decrease (but the SM will still be using the same size and number of dots)