More fiddling with Color Print Shop...using a rainbow background.
I was integerizing the coordinates, and that wasn't quite right.
It looks more like dot matrix output now:
![[Linked Image from i.imgur.com]](https://i.imgur.com/7tnn5UV.png)
![[Linked Image from i.imgur.com]](https://i.imgur.com/amB8ZA5.png)
but the file size is huge: 515MB
515665131 Oct 9 18:41 test94.pdf
No wonder it takes a minute to render it.