Promted for ‘Scaled resolution’ parameters.Can’t quite believe that you need to disable SIP to set a custom resolution, so Google it, end up back at the SwitchResX website where the author has a similar opinion.Discover this part of the app only works if you disable System Integrity Protection.Open the ‘Manual Resolutions’ tab in SwitchResX.Back to Google “custom HiDPI resolutions in OSX”.Try some HiDPI options, they look good but they are the wrong Aspect Ratio, so there black bars at the sides of the screen.Find the ‘supported’ resolution options for my Screen - there are lots more than in the Apple settings dialog, including some HiDPI ones.
#Parallels for mac windows 10 screen resolution rendering bad software
Find post talking about some software called SwitchResX. (This is completely undocumented by Apple - Thanks Apple!) Eventually discover that OSX only natively supports HiDPI modes on monitors with specific Aspect Ratios. GO back to Display preferences, hold down Option and click Scaled. Eventually find some posts that talk about specific ‘HiDPI’ scaling options by pressing the ‘Option’ key while clicking the Scaled radio button. That lowering the resolution is the same as scaling (FML you idiots). I need to buy an Apple approved display. Read through the top links which are all blog posts where die-hard Mac users tell me:. Look for other settings related to Scaling. Try some alternative resolutions, they all look blurry and awful, as expected. Weird, all it does it give a list of alternative resolutions. Things are still too small on the external display however, time to tackle the Scaling. IT WORKS!!! No more text blurring and color bloom. Copy the EDID file created to the correct System folder. Run the script - it writes a new EDID file. Jaw drops at complexity of the fix - recovery mode?!!?!. Eventually find this excellent blog post with a fix:. Finally find a forum post that explains the problem is that OSX incorrectly forces the color mode on some external screens to YPbPr/YCbCr instead of RGB. Font smoothing is enabled, so I try disabling it. Click General (weirdly this is not considered a ‘Display’ setting). Decide to try the font smoothing thing. Try enabling or disabling font smoothing. My eyes are at fault because I’m comparing it to a Retina screen now and the Retina is SO good that everything else looks blurry. OSX is ‘better’ because it displays fonts differently and this can make them blurry. Read 4 top links that are a collection of forum posts where die-hard Mac users tell me that:. Google it, not sure the exact issue, so try ‘OSX external display fuzzy text’. The screen doesn’t look right, text and black on white elements are blurry and have chroma ‘bloom’ around them. 
OSX High Sierra/Mojave (approx 2.5 hours) This gives you a smoothly scaled external monitor experience which keeps UI elements approximately the same ‘size’ as you drag them between the Retina and external display. Quick guide to enable correct color mode and 125% scaling on external Dell 4K (2650 x 1440) monitors with your MacBook.
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