The image gets shrunk. There are several ways of doing that. You could just skip pixels.
So for instance, a line from the image with 8 pixels:
12345678
when shrunk by half would become:
1357
You don’t need to do it by halves, for instance you could do by a third by removing every third pixel:
124578
But that doesn’t give the best results, because it looks really bad on fine details. Like if there’s a single pixel thick line somewhere it can just vanish entirely when you do things that way.
So a better way to do that is to average the pixels. If you have a black line surrounded by white and shrink that you get a middle grey sort of line.
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