The size of the latex preview overlay scaling is inconsistent across screens with different pixel densities.
I've set my customization to use dvipng for the latex previews I see when I type C-c C-x C-l. Dvipng is customized as follows:
The "Value" is set to (1.0 . 1.0), which I would think means that the font size in the preview overlay is scaled the same as the font size org buffer's normal text.
This is more or less true for a Windows 7 machine connected to a 24", 1920x1080 pixel monitor:
However, on a Windows 10 machine with a 12.3", 2736x1824 pixel monitor, the same customization looks like this:
On the second computer (a Surface Pro 4) the previews are tiny because the screen has a much higher pixel density; the normal text is scaled appropriately but the overlays aren't scaled to match.
I'd like keep the same .emacs file across all the machines I have to use, so it would be best if the preview scaling was consistent.
Possibly the overlay scaling calculation is done using the function window-text-width without the pixelwise argument, which would return a width in characters. To avoid changing the calculation too much, you could use window-max-chars-per-line, which considers font size and some things that would be missed by window-text-width even if pixelwise was used.
-- my setup ------------------------------------------------------------------------------------------
Emacs : GNU Emacs 25.1.1 (i686-w64-mingw32)
of 2016-09-17
Package: Org mode version 9.0.1 (9.0.1-elpaplus @ c:/Users/sotterson/home/.emacs.d/elpa/org-plus-contrib-20161118/)