bug#52931: 27.1; image-size sometimes yields a wrong image size in pixels

[Eli Zaretskii]

> From: Markus Triska <triska@metalevel.at>
> Date: Sat, 01 Jan 2022 18:00:54 +0100
> 
> Dear all,
> 
> to reproduce this issue, please download the following image:
> 
>     https://www.metalevel.at/ei/202202.png
> 
> Then start Emacs with
> 
>     $ emacs -Q
> 
> and evaluate the following form to obtain the image's size in pixels:
> 
>     (let ((img (create-image "202202.png")))
>       (image-size img t))
> 
> In my case, this yields:
> 
>     (30 . 30)

I cannot reproduce this: I get (202 . 202), both in Emacs 27.1 and in
the current master version.

Maybe this is macOS-specific?