Line art pixelated in GIMP but not in Windows Photos viewer

[slowdownthere]

(02-11-2022, 07:47 AM)Ofnuts Wrote: At 2000x2000, 300 ppi, the real print size is 6.7".

Gimp is an editor, when you zoom in it shows bigger pixels, because you want to see the actual pixels (so, at 400% zoom, a pixel is displayed as a 4x4 square). Photos is a browser, when you zoom in it shows a bigger image, and it scales up the image by interpolating pixels, so the lines are not pixelated but become blurry.

If you need a bigger image in Gimp, you can scale up the image (Image > Scale image, Scale tool, etc...) and unless the interpolation methd is set to None (typically, NoHalo in Gimp 2.10) then you will see something similar to what Photos does.

For some context about what the image size means, see this.

Thanks so much for the input! The issue I was having with the blurriness translated into print as well, with images printed from GIMP being significantly more pixelated that the print coming from Photos. I've tried your suggestions but have not had luck with the printed outcome unfortunately. Will try in Inkscape since some have reported better success with that. 

Thanks again!