https://bugzilla.redhat.com/show_bug.cgi?id=1645763
--- Comment #19 from Alexei Podtelezhnikov <apodtele(a)gmail.com> ---
Please do not re-start the debate about filters. This has been thoroughly
studied and published:
https://pdfs.semanticscholar.org/15e7/43f090862d29ca3159f79aee85b49b029a0...
In summary, use either DEFAULT or LIGHT. They are both within the paper
conclusions. DEFAULT is wider and blurrier and therefore more resistant to
incorrect gamma correction. LIGHT is as good as it gets provided that gamma
correction is also used.
Harmony is bit-identical to LIGHT withing small rounding error. In the next
release it will be possible to tune Harmony for some PenTile displays, which is
impossible with simple filters. That might be a reason to prefer Harmony.
We at FreeType might soon consider enabling filtering by default so that users
are not forced to make a choice, rather NONE will need to be selected.
Finally it is possible to undefine USE_LEGACY in ftlcdfil.c, so that it is
never used.
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