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July 26th, 2015 08:00
P2415Q screen, backlight leakage
Hi,
I've bought an P2415Q screen to do my Photoshop and movie stuff on. Three questions about it:
1. I thought this screen would be the perfect solution, because of its high quality specs. The colors are great and deep, no problems with that. But when I show a movie on it, black is a kind of grey, not deep black. When I move my head, the "grey glow" changes somewhat. This is the same kind of black / grey glow as I get when I power on the screen. Also at the edges I see some white / grey glow, kind of backlight leakage. I thought IPS panels, especially this kind of special IPS, wouldn't have this? Or is this normal?
2. How can I get the factory calibrated values? I don't have the original dell docs anymore, our cleaner just cleaned a bit too hard :( Haha. Can i get those from Dell again, using my SN? If I do a "reset to factory defaults", does this reset the calibration values too?
3. Can I calibrate my screen myself? How do I do this the best? Software (like Calman?). What is a good way to start with?
Hopefully someone can help me out with this.
Thanks a lot,
John
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yumichan
3 Apprentice
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739 Posts
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July 28th, 2015 05:00
1- IPS-like screens are limited to ~1000:1 "native white" contrast ratio(CR). If want 2000:1 static CR or more, move to VA panels which have other limitations.
1000:1 CR limits how "black" your RGB 0,0,0 black will be. As an example if a IPS-like scren with white luminance configured @120cd/m2, then its black will bright near @0.12cdm2 (120/1000) which is noticeable in a darkened room enviroment.
-Black point brightness increasing as you move your head to the sides of screen is "glow". This is one of IPS-like technology limitations.
-Black point uneveness across the screen, usually on corners, "usually" yellow or blue, seen with your head in from of screen center, it's called backlight bleed. This is a Quality Control issue AFAIK not covered by waranty an all these "cheap/affordable" monitor manufacturers (so return for refund ASAP if not aceptable four your tastes).
2-I think you lost them forever
3-ALL monitors can be calibrated by its owners assited by computer graphics card LUT. You'll need proper hardware (i1Displaypro colorimeter is best for your money) and a software that can compute graphics card LUT corrections to fix grey (gamma and neutrality to its white). Best software to perform this task is ArgyllCMS, freesoftware avaliable or Linux, OSX & Windows with an optional "graphic interface" called DispcalGUI which is free too. Calibration among other useful info for color managed programs like Photoshop will be stored in a ICM/ICC file (a "profile"). Configure your screen in your OS so it can apply that ICM/ICC profile to your screen.