[AUCTeX] Adjusting settings for inline previews

[Jason Alexander]

Hello,

I’m using AUCTeX 11.90.2 on a retina display Mac running Sierra.  I’d like to 
adjust the settings for the inline previews so that (a) the background colour 
of the preview exactly matches that of the window, and (b) to increase the 
resolution of the previews so that they don’t appear washed-out and pixelated 
with respect to the rest of the text.

A small screenshot of some text with a preview can be found here:

        https://www.dropbox.com/s/6boeo4bkiovxbmv/preview-screenshot.png?dl=0

Under close inspection, you can see that the background colour doesn’t quite 
match that of the window.  And although it looks like the colour of the text 
matches, more-or-less, the emacs text, the course pixellation with 
anti-aliasing makes the math equation look washed out and a bit hard to see.

I had a look at the various options for preview, but I’m at a loss what options 
to change to bring out the kind of effect I’m looking for.

Best wishes,

Jason