Samsung U28D590 4K Display: Blurry, chromatic edges. No HiDPi mode.
Being so in love with the Retina Display on my 13 inch MacBook Pro Retina Late 2013 (16 GB RAM, 512 MB SSD), I just purchased the new low-cost Samsung U28D590 display. It has a TN panel, so the color accuracy is mediocre when it comes to viewing angles, but I was expecting that. Also the 30 Hz doesn't come by surprise, although I was hoping for more (it is connected HDMi Port Mac -> HDMi Port display). I'm aware that the GPU in the MBPr probably hasn't enough steam to do more (compared to the more powerful GPU in the 15 inch MBPr).
There are two things however which really bug me, and which makes me consider getting rid of the display:
1. No HiDPi
Despite running 10.9.3, there is no HiDPi mode. I also tried it with closed lid on the MBPr, but nada. 3,840 x 2,160 just renders the GUI a bit too tiny to fell comfortable. This is all I get („Niedrige Auflösung“ is german for „low resolution“; I can get more resolutions to choose from by pressing the option key when clicking on "Scaled", yet none of them are HiDPi).
It would be interesting to know whether this is a limition in Software (namely Mavericks) or caused by GPU limitations. Ideas?
2. Chromatic halo (aberration) around text (and some graphics, too)
The rendered content (text and certain graphics) has a nasty reddish or blue halo. When viewed on the MBPr internal display it looks fine, when moved to the Samsung U28D590 it immediately becomes colorful blurry and annoying. See here (ignore the different pixels per inch, just look at the halo):
Click image for full resolution. I made a photo rather than a screenshot to better show the annoyance.
Disabling LCD Font Smoothing in the System Preferences are not a viable solution to me, as I'm then back to jaggies rather than razor-sharp, super-smooth text. I also tried the "defaults -currentHost write -globalDomain AppleFontSmoothing -int 1/2/3" trick, but that did not improve the situation either.
I remember that long time ago, Mac OS X had the option to adjust the red/blue halo/shift in the Font Smoothing/Anti-Aliasing, which could be handy here.
The next thing I'll try is the procedure described in here (force RGB mode), although I'm not sure whether it describes my problem or not. Other than that, I'm clueless. Keep in mind that the text shown is really tiny at 4K on 28", which makes the halo really annoying.
Any ideas?
Sidenote: Like most Korean displays, the U28D590 has a silly sharpness setting (IMHO 1 pixel should be 1 pixel. Boom. No image altering sharpness adjustment needed), however it is set to the default value of 60 and changing it, does not remove the chromatic halo, but only makes the image more blurry or ridiculously sharp.
MacBook Pro with Retina display, OS X Mavericks (10.9.3), Late 2013, 2.6 GHz i5, 16/512 GB
