Imac 5k 2015 display quibbles

[Philflow]

I bought a used late 2015 Imac 27 inch from someone. Colours look fantastic but I'm not 100% satisfied with the contrast, especially the black level.

For example: it looks like black letters (especially on the top area of the screen) aren't as deep solid black as I'd like them to be. The black level isn't bad, but when I compare them to an old 24" inch TN display I have next to it, it falls slightly short. And that's a very cheap LCD.

I'm wondering if I just got unlucky with this unit.

Up on searching I found this review, that explains what I notice: "The contrast ratio is okay at 740:1 (average for workstation notebooks, for example) and is definitely sufficient for nice pictures."

https://www.notebookcheck.net/Apple...ch-M390-Late-2015-Retina-Review.155325.0.html

However, most other reviews measure around 1100:1 which is really what it should be.

Does anyone know what might be going on?

I've played around with the calibration profiles but that didn't solve it.

 

[mikehalloran]

Does anyone know what might be going on?

Are you on Mojave?

I've played around with the calibration profiles but that didn't solve it.

This doesn't just apply to Mojave:
https://www.howtogeek.com/358596/how-to-fix-blurry-fonts-on-macos-mojave-with-subpixel-antialiasing/

 

[Philflow]

Are you on Mojave?
This doesn't just apply to Mojave:
https://www.howtogeek.com/358596/how-to-fix-blurry-fonts-on-macos-mojave-with-subpixel-antialiasing/

Thank you. Yes I'm on Mojave. I ran the command
"defaults write -g CGFontRenderingFontSmoothingDisabled -bool NO"

and that does look a bit better.

Still I was hoping for a higher contrast ratio. This isn't what I expected from 1100:1. It looks more like 800:1 as Notebookcheck measured. I wondering if I got unlucky with this unit.

Apple only uses 1 type of display right?

 

[CWallace]

LG is the only supplier of 27" 5K displays so all iMacs use them.

There are probably hundreds of posts (if not threads) about the "panel lottery" when it comes to iMac displays going back to the first non-Retina 27" models. As with all IPS panels, there is LCD light bleed along the edges and LG has gotten better with it over the years, but that might be part of the issue.

 

[ZipZap]

Are you on Mojave?
This doesn't just apply to Mojave:
https://www.howtogeek.com/358596/how-to-fix-blurry-fonts-on-macos-mojave-with-subpixel-antialiasing/

The article clearly states its not for iMac 5K...the OP indicates he has a 5K....in the title.