Ideally this could be more automated (make visual-test or something), but this can be done with something like ftview from the freetype2-demos suite:
$ ftview -w 1000 -h 1000 16 old/Ubuntu-Regular.ttf release/Ubuntu-Regular.ttf
Then switching forward/backward with n and p keyboard inputs.
Where 16 is the point size, and the following arguments are the TTFs to test render. The resolution can either be specified with -w/-h for width/height, or -r for resolution.
*(A more mechanical way would be to output overlaid renderings to PDF, render these with various PDF engines (mupdf/Popper/…) and look for colour fringing where there is not a perfect overlap.
Ideally this could be more automated (
make visual-testor something), but this can be done with something likeftviewfrom thefreetype2-demossuite:Then switching forward/backward with
nandpkeyboard inputs.Where
16is the point size, and the following arguments are the TTFs to test render. The resolution can either be specified with-w/-hfor width/height, or-rfor resolution.*(A more mechanical way would be to output overlaid renderings to PDF, render these with various PDF engines (
mupdf/Popper/…) and look for colour fringing where there is not a perfect overlap.