[OS X TeX] A real mistery

[Alain Schremmer]

> On Feb 22, 2021, at 1:07 AM, Stefan Evert <stefanML at collocations.de> wrote:
> 
> 
> 
>> On 22 Feb 2021, at 04:01, Ross Moore <ross.moore at mq.edu.au> wrote:
>> 
>> The label A is not actually in the file; at least not anywhere that I could find,
>> using Acrobat Pro and Illustrator CC.
>> 
>> Try Zooming-in on the A (using Preview, say).
>> The A disappears.
> 
> It doesn't disappear for me (e.g. with Preview), but it becomes a blurry pixel image while the rest of the figure remains sharp. 
> 
>> So I think that there must have been a preview added to the file,
>> which is used rather than a complete re-rendering, when the image
>> is viewed within a certain size range.
> 
> My PDF reader says that it's a stamp annotation. Not surprised that tex won't include annotations on a PDF image in the document.
> 
> Best,
> Stefan

For what it’s worth :

here is a zoom of a copy of example.pdf with Preview 10.0 (944.5) under OS X 10.13.6:

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But when I compile sample.tex, I have no A



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