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<p dir="auto">On 11 Aug 2022, at 10:06, Bruno Voisin wrote:</p>
</div><div class="plaintext" style="white-space: normal;"><blockquote style="margin: 0 0 5px; padding-left: 5px; border-left: 2px solid #777777; color: #777777;"><blockquote style="margin: 0 0 5px; padding-left: 5px; border-left: 2px solid #777777; border-left-color: #999999; color: #999999;"><p dir="auto">On 11 Aug 2022, at 15:19, Kai von Fintel <tex@fintel.mailworks.org> wrote:</p>
<p dir="auto">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.</p>
</blockquote><p dir="auto">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).</p>
<p dir="auto">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.</p>
<p dir="auto">I tried to look at the FontForge doc at <<a href="https://fontforge.org/docs/ui/mainviews/charview.html" style="color: #777777;">https://fontforge.org/docs/ui/mainviews/charview.html</a>> , 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.</p>
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<p dir="auto">Right, the problem is with the text font =. We’ve worked around it by either using the math = (coding it as $=$) or using the boldface text = (\textbf{=}). Neither seems optimal but what workaround ever does?</p>
<p dir="auto">I have no competence in the internal workings of fonts, so your discovery doesn’t translate into an obvious fix that I can come up with.</p>
<p dir="auto">— Kai.</p>
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