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U2718Q DP and HDMI input inconsistency at green channel
I have received my U2718Q and enjoyed with its 4K ability. However, I totally doubt how Dell had calibrated the monitor to have a Delta < 2 for U series monitors. I could not further calibrate the monitor to an acceptable colour representation.
I connected devices to U2718Q from DP and HDMI. On HDMI, the colour representation is great with all visible colour gradient as shown on the image below. (Please pay attention on the green gradient >28, the colour change is visible)
However when I connect at Displayport, the colour representation had a huge change with green gradient > 28 all brightened, making the brightest range on green indistinguishable. (please see below image)
The outcome caused from brightened green channel is the screen will look all greenish as all light grey has a 255 level of green added on it (assuming we represent the colours in RGB level, all neutral light grey say in [210,210,210] will be displayed as [210,255,210]). Or in gamma level, the monitor displays a green gamma at 1.5 on luminance 48%, the rest of colour channels and luminances are ~2.2 and they are great. However, the green channel at bright side caused a serious disaster to the monitor performance.
The most interesting thing is the problem won't happen on HDMI input and only exist in DP input. I have already tested on multiple systems like PS4/PC/Mac and the monitor did not perform correctly with all DP input from all input sources.
I am aware that Dell has replied on a similar thread that U2718Q only supports legacy Windows released 3-4 years ago which is obviously a shame for Dell's most recent sub-flagship product released just for a month. I deeply hope the information captured was incorrect and could be rectified if any.
Now that I have tested the DP input from a Windows PC (instead of a Mac that Dell would refuse to offer support to a Mac user), could Dell take an action to confirm if the DP input function has some defect (on a software side I supposed) and would it be possible to fix it with firmware updates?
I deeply hope Dell could take a serious step to inspect the case as it is not an individual unit problem anymore. I am also expecting a formal reply from Dell and I am happy to cooperate to test and help improve Dell's newest product. Thank you.
DELL-Chris M
Community Manager
Community Manager
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54.2K Posts
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September 11th, 2017 07:00
Refunds are only given inside the first 30 days from the invoice date. Outside of that, you would have to escalate to a manager AFTER you explain the issue to the representative. Typically, hardware calibration is saving the data internally in the Color Settings- Preset Modes- Color Space- Cal 1 or Cal 2. But I do not see that on this model, U2718Q. I do see it on the higher ended UP2718Q. Perhaps for this model, it is saved in the operating system and the calibration software.
kostasfi
18 Posts
0
September 12th, 2017 07:00
Any ideas why Input Color Format RGB is so bad?
Is there a way to fix it?
ycw9921133
7 Posts
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September 12th, 2017 08:00
We are not begging to get a refund but hoping for a firmware update to correct the monitor behaviour.
And we discovered a workaround to get the correct colour but none of my devices provide such setting to cope with the monitor.
So... will Dell consider to anything to rectify the issue?
kostasfi
18 Posts
0
September 18th, 2017 03:00
A friend of mine has the P2715Q monitor, so I tested it with Eizo monitor test.
The monitor has exactly the same problem with U2718Q but in YPbPr mode, the RGB mode works fine.
Really? you can not make a monitor that works in both modes??????
Anonymous User
2 Posts
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September 19th, 2017 05:00
I'm facing the same issue here, at work I use P2715Q with display port and the greens work perfectly.
At home I have the U2718Q connected with mini display port and the greens are too bright.. should I return the monitor (I'm still on 30days period) and ask for the old model? Or is possible that in the near future there will be some firmware update? (even though I'm a Mac user I and I read here that you dont give any support for Mac users?)
Thank you
DELL-Chris M
Community Manager
Community Manager
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54.2K Posts
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September 19th, 2017 13:00
Before you attempt to initiate a refund, you should ask the Apple users on their Forum for advice. Same with the Surface products.
Anonymous User
2 Posts
2
September 20th, 2017 13:00
Hi Chris,
I'm sorry but this not seems an Apple issue, I just tried with my windows 10 desktop and using DP is the same issue, the greens are too bright.
Exactly the same issue on my Mac, if I use the HDMI port, then the greens are as they should be.
I don't understand how a middle-high product like this can have such a problem for so many users and the only DELL reply is to buy some expensive hardware to calibrate the monitor...
DELL-Chris M
Community Manager
Community Manager
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54.2K Posts
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September 21st, 2017 07:00
Francisco,
Firmware updates are expensive and time consuming. They are only done for systemic failures reported by thousands of monitor users. You should contact Dell Order Support and return the product for refund.