[lucida] Lucida OT equality symbol looks faint in Adobe Acrobat

[Bruno Voisin]

> On 11 Aug 2022, at 15:19, Kai von Fintel <tex at fintel.mailworks.org> wrote:
> 
> Thanks for the confirmation, Bruno. It is indeed a rendering issue that arises with Acrobat and Lucida OT. Other OT fonts (like the TeX Gyre fonts) do not show this. So, I was wondering whether any Lucida OT experts had any thoughts on what might be happening.

What's puzzling is that in your example the issue only arises with = from the text font (LucidaBrightOT.otf), not = from the math font (LucidaBrightMathOT.otf).

Opening the two fonts in FontForge and looking at the EQUAL glyphs, these look exactly the same, except for the presence of additional horizontal fat lines made of a bluish cross patterns at vertical positions 349 and 615 in the text font. I've no idea what that means, whether it's connected to hinting.

I tried to look at the FontForge doc at <https://fontforge.org/docs/ui/mainviews/charview.html>, there are three such lines visible in an illustration in the Pointer section, but I couldn't find any explanation of what these lines are meant to be, or even how they are called.

Bruno

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