Yeah, it's definitely better than reducing a high res sketch or the like. This way, you get to selectively pixel and see if you're making the right decisions as you go thanks to the reference layer.
That's correct, Mikko. One more suggestion, though. My original, high resolution sketch is at 5"x5" @ 300dpi. I divided the width in pixels by 32 to get my pixel distance between spaces in the grid for the first step. Mikko's method of adjusting the gridline every 1 pixels is for the second step when you're actually working at your sprite size (which in my case was 32x32).
That's correct, Mikko. One more suggestion, though. My original, high resolution sketch is at 5"x5" @ 300dpi. I divided the width in pixels by 32 to get my pixel distance between spaces in the grid for the first step. Mikko's method of adjusting the gridline every 1 pixels is for the second step when you're actually working at your sprite size (which in my case was 32x32).