Don't start darktable, just open /Applications directory, find
darktable.app there, open context menu for it and select "Get Info".

On Tue, 19 Aug 2014 18:51:55 +0200 (CEST)
"tiz...@libero.it" <tiz...@libero.it> wrote:

> Sorry, I'm new to Darktable and I cannot find this checkbox. The only thing I 
> could find is the "global preferences" button (gear icon on top left of 
> canvas), but neither "GUI options" nor "core options" have such a setting. 
> 
> By the way, below a link to two more screenshots: I just realised that at 
> 100% 
> image zoom in darktable, a checkerboard pattern appears for the 1.4.2 
> release. 
> Again, x11 fullscreen works fine.
> 
> http://we.tl/mQgabCKw9H
> 
> 
> 
> >----Messaggio originale----
> >Da: para...@paraf.in
> >Data: 19/08/2014 18.16
> >A: <darktable-devel@lists.sourceforge.net>
> >Ogg: Re: [darktable-devel] R: Re:  darktable on HiDPI screen (rMBP)
> >
> >Can you please open an Info window for darktable application (I'm
> >referring to 1.4.2 release obviously) and look for "Open in Low
> >Resolution" checkbox? Is it there, is it enabled and is it dimmed?
> >
> >On Tue, 19 Aug 2014 18:00:34 +0200 (CEST)
> >"tiz...@libero.it" <tiz...@libero.it> wrote:
> >
> >> 
> >> 
> >> >----Messaggio originale----
> >> >Da: para...@paraf.in
> >> >Data: 19/08/2014 11.22
> >> >A: <darktable-devel@lists.sourceforge.net>
> >> >Ogg: Re: [darktable-devel] darktable on HiDPI screen (rMBP)
> >> >
> >> >Hi,
> >> >
> >> >On Tue, 19 Aug 2014 11:01:17 +0200 (CEST)
> >> >"tiz...@libero.it" <tiz...@libero.it> wrote:
> >> >
> >> >> Hi all,
> >> >> 
> >> >> I just decided to try darktable on a Mac Book Pro with retina display 
> (I 
> >> am 
> >> >> exploring the free alternatives to the rather expensive Adobe 
> Lightroom).
> >> >> 
> >> >> As for many other applications on the Retina displays there are some 
> >> issues 
> >> >> due to the pixel scaling. Most of the interface looks great, but some 
> >> elements 
> >> >> show the "pixelated" effect due to pixel scaling. Unfortunately this 
> >> affects 
> >> >> also the main canvas where the photo are displayed and this renders the 
> >> entire 
> >> >> software essentially unusable for me.
> >> >
> >> >screenshots would be nice, some people mention from time to time
> >> >problems with high DPI, but few of them show how it looks exactly.
> >> >
> >> 
> >> I uploaded some screenshots here, comparing the different configurations I 
> >> tried so far.
> >> There's also a screenshot I took from the demo version of Lightroom 5, as 
> a 
> >> benchmark.
> >> View the pictures at 100% zoom and you'll se what I mean by "pixelated".
> >> The effect is best noticed in the photo around the small lamp post and at 
> the 
> >> nearby balcony.
> >> Going up with the resolution the effect is less noticeable, but it only 
> >> disappear with X11 in fullscreen
> >> (resolution set to the maximum with xrandr).
> >> 
> >> >> 
> >> >> After installing the latest release (1.4.2), I also pulled out the git 
> >> repo 
> >> >> and build dark table from source on my machine (darktable 1.5
> >> +1718~gf7b7ed6).  
> >> >> All dependencies have been installed through homebrew.
> >> >> 
> >> >> This version shows up as XQuartz window and entering X11 fullscreen in 
> >> high 
> >> >> resolution, the result is acceptable. Of course no pixelation, font 
> size 
> >> is 
> >> >> somewhat small but still readable: overall better than in the released 
> >> version 
> >> >> (if there's a trade-off I'd rather favour image quality over menu 
> >> appearance).
> >> >> 
> >> >> Issues with this are that I have to enter X11 fullscreen (XQuartz 
> issue), 
> >> and 
> >> >> most important I get a segfault 11 the second time I start dark table 
> >> (after 
> >> >> rebooting it starts again).
> >> >> 
> >> >> So here my questions:
> >> >> - Is there some advance in the development in order to solve the 
> problems 
> >> with 
> >> >> HiDPI displays?
> >> >
> >> >Some time ago one of the users suggested adding NSPrincipalClass ->
> >> >NSApplication to Info.plist, which should have helped with retina
> >> >support, but we never got any solid confirmation what changed after I
> >> >did that. Also I think houz did some changes in git master which
> >> >concern UI scaling according to DPI setting, but I never tested that on
> >> >OS X.
> >> >
> >> >> - How do I properly build darktable from source on os x?
> >> >
> >> >See packaging/macosx/BUILD.txt. You have built gtk with X11 backend, I
> >> >use native quartz backend, which makes more sense to me.
> >> 
> >> Ok, I missed that file: I only followed the general build instructions. 
> >> Moreover, I'm rather new to OS X, so I don't actually know how to set the 
> >> native quartz backend. I'll have to look for some documentation and do 
> some 
> >> trial and error.
> >> 
> >> >
> >> >> - Are there actually any developers testing/developing darktable on the 
> >> rMBP?
> >> >
> >> >I'm the only developer with Mac, and I don't have retina display, so no.
> >> >
> >> >> - By chance, does anybody know if I can get full resolution in XQuartz 
> also 
> >> in 
> >> >> rootless mode?
> >> >
> >> >I didn't even know that it has any modes other than rootless... How do
> >> >you enter fullscreen mode?
> >> >
> >> 
> >> Under the menu X11 -> Preferences, thick the Fullscreen Mode checkbox. 
> Then 
> >> the combination alt-cmd-A toggles between Fullscreen and normal mode. To 
> take 
> >> advantage of full retina resolution in fullscreen, I use "xrandr --output 
> >> default --mode 2880x1800 --rate 60".
> >> 
> >> 
> >> >> 
> >> >> Thanks and best regards!
> >> >> 
> >> >> Mauro
> >> >> 
> >> >> 
> >> 
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> >> >> darktable-devel@lists.sourceforge.net
> >> >> https://lists.sourceforge.net/lists/listinfo/darktable-devel
> >> >
> >> 
> >> 
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