On Fri, 8 Jan 2021, Hans Hagen wrote:

> On 1/8/2021 12:39 AM, Vedran Miletić wrote:
> 
> > It's whatever ConTeXt standalone has. I don't have any extra Lua installed:
> 
> --credits should mention the lua version
> 
> > Should I see it on non-HiDPI as well? Because it seems it's there.
> 
> depends on what you consider (non) hdpi ... the positioning of glyphs 
> depends on font scale, rounding of stems and such (hints in fonts but 
> these get less relevant with high res displays), caching, inter glyph 
> corrections (that pdftex/luatex/...) put in the text stream to resync 
> within certain tolerances, etc ... (often a print is a better reference 
> as displays are seldom 600+ dpi) .. it's also why often expansion looks 
> bad on screen because even a sub percentage difference can give such 
> effects

Another way to see it is just zoom in on the PDF. If the artifacts go away on zooming in, then they are due to anti-aliasing.

Aditya