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

[Kai von Fintel]

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.

— Kai.

On 10 Aug 2022, at 10:53, Bruno Voisin wrote:

>> On 10 Aug 2022, at 16:19, Kai von Fintel <tex at fintel.mailworks.org> wrote:
>>
>> A pdf produced via XeLaTeX from the following minimal tex file (using the lucida-otf support files from CTAN) displays fine in many pdf viewers but in Adobe Acrobat the plain = and its italic version show up faintly or in outline. I attach a screenshot of how it looks in Acrobat.
>> This is a mystery to me. Does anybody have an idea of what might be happening?
>
> This looks like an Acrobat rendering issue.
>
> I observe the same here on the Mac. Things are fine in Preview. In Acrobat the display is the same as yours at 200% magnification, but things get right switching to 400%. See the attached screenshot, Acrobat top, Preview bottom.
>
> Increasing the magnification by units of 10, things get right when switching from 210% to 220%.
>
> I don't use Acrobat generally for displaying PDF files, only for manipulating them (extracting pages, combining files, comparing them, adding OCR, etc), so unfortunately I don't have much experience with rendering issues. I tried playing with the settings in Preferences > Page Display > Resolution and Rendering, but didn't notice any effect.
>
> Bruno Voisin