No, that was 2560 HDPI mode.
BOTH with Scale “More space” and RDM 5120x2880 rawtherapee creates 2 folders, a 72 and an 80. The same as before, after quitting 72 folder is gone; 80 remains with unaltered contents. Both versions Scaled and RDM generate exactly the same folder’s contents.
Forget that, I was testing both 10 and 14 pt fonts… All 3 versions behave exactly the same (creating 72 and 112 folders)
Here is the new mac test build for your testing:
https://kd6kxr.keybase.pub/RawTherapee_OSX_10.9_64_5.5-82-g0407dc348.zip
The folder situations seems as before, the same throughout the 3 versions. Regarding type render, here screenshots, ALL14pt font
default
Scaled “More space”
RDM 5120
If need be I can also take 10pt screenshots… but I don’t to pollute unnecessarily, says the dignified mercury pond to the plastic bag
@Claes Your screenshot are fine, but they are all unscaled, which is fine too. Depending on the monitor size, user might want to zoom everything by a facto x2 to avoid having very small icons, but you’re fine with small icons. Since this branch is about how does the icons look if you raise the dpi settings and/or use bigger font, I can’t see if the patch is working fine. However @chroma_ghost screenshots tells ma that I really have to dig the MacOS API, there’s something wrong here. I’ll be away till Saturday, so it will have to wait a bite.
@HIRAM What is the Gtkmm version of your build ?
Salut!
When you are back again – and if you need more input from me and my 28" monitor, just send me a ping. But please state carefully what you want me to do, so I do not waste your time.
/Claes
Why are your desktop icons so small when you set 144dpi?
It looks like the dpi setting has no effect. Neither in RT nor for the desktop. 
Nice catch!
Well, a simple reply would be that I am on Manjaro/Xfce/UHD monitor/GTX1050,
a combination that has about 7.23 million possible settings.
Ref https://forum.manjaro.org/t/hidpi-support-in-manjaro/26088
for masochists with oceans of free time.
I have found a base setting which works with my eyes [even if it means
that the nice properties of the monitor are not is use 
]
However, I am always open for suggestions about settings that would
make my set-up even nicer…
Have fun!
Claes in Lund, Sweden
I tried to find some literature on Hi-DPI on MacOS, but couldn’t find any.
@Claes @chroma_ghost MacOS seem to prefer setting a bigger or lower screen size and scale it to the physical size (so that all application think they render in a 72dpi constant resolution ?) instead of tweaking the base font size. Could you show a screenshot of another application (not necessarily graphics related) to see if its icons are blurred too in a HiDPI mode, with “Resolution = Default for display” ? Please use filebin.net instead of posting here, there’s already lots of uploaded screenshots.
The RDM tool’s README indicate that some resolution scale all element by factor 2 (those with a thunder symbol in the menu), but not all. Using GDK_SCALE in RT should force a scale of 1:1, but it doesn’t seem to work on MacOS, so everything is still scaled in those HiDPI modes. If you select a resolution that doesn’t scale, everything is controllable and clean in Rawtherapee, but your desktop icon size can be very small.
3 screengrabs: default ( imac pref) / more space ( imac pref) and 5120x2880 ( RDM)
when in “more space” the screenshots’ size increases to 6400x3600, if I set RDM to
7680x4320 sure enough the screenshot scales to that size
apps are Filmulator, Darktable, the preference panel and system menu bar and BTT
https://filebin.net/hdtnkzelne3nnc0f/3_screengrabs_imac.zip?t=hoq69i5c
I don’t own an Apple product, but based on what I have read and heard, they do resolution gymnastics so that all of their products are proportional to one another and high enough in resolution to be called retina, at least Apple’s definition. I suppose it makes it easier for their OSs to deal with the GUI, scaling and drawing. ATM, I cannot find the sources that explain all of this but they exist.
hidpi-icons branch is now ready. You can test it before we merge it into dev.
Nothing fundamentally changed, you’ll still need RDM to exploit the full resolution of your monitor for Apple users. Setting a bigger/smaller font size in RT’s Preferences will scale the whole interface.
@Hombre thanks for your work. I can make a test build for Mac but not until after vacation. I’ll be home in about ten days.
I believe the branch was merged to dev by @Hombre, so perhaps some mac users with Retina, 5k, hidpi type monitors would care to test it…
hm. I am not sure if I can help. I have a laptop screen with full hd resolution but with 13 inch. when using normal desktop scaling, everything is pretty tiny…
Then the new feature is made for you. 
Test it.
do I actually need to compile the program?
At the link given above you will find dev branch builds ready-made for windows and Mac.
