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U2711 sRGB mode not working
I've got a U2711 connected to a Mac (actually 4 different Macs while trying to resolve this problem, OSX Tiger, Leopard, 2x Snow Leopard). Via the display's menu I've changed the gamma mode from PC to Mac. If I leave it on the PC setting colours look off, blues in particular look slightly purple.
However when the monitor is set to Mac, hues look better but I cannot activate the sRGB monitor preset. I can select it, but it's visually exactly the same as AdobeRGB.
For the majority of the time I do not want wide gamut features and the problems they can cause in some apps. I'm reliant of the sRGB mode.
Right now, I'm working with the monitor back in PC mode, sRGB preset selected, and in OSX sys prefs I've got the GenericRGB colour profile assigned to the display. The blues are off, even to the untrained eye, but at least there are no oversaturation problems in any app.
Is there a better configuration, or is the monitor faulty?
If it helps, the monitor is intended to be used for webdesign (sRGB is essential), broadcast graphics (sRGB again), and some illustration/photography (AdobeRGB).
spacematt
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September 21st, 2010 09:00
Okay, I've disconnected the monitor from the Mac and plugged it into a PC. I just have a couple of questions.
When I switch the monitor from PC gamma mode to Mac gamma mode am I supposed to see a shift in hues or is there something amiss? I would have thought gamma would only make the picture seem brighter or darker, not change the colours.
If I prefer the look of the monitor with Mac gamma, despite being plugged into a PC, should I expect that changing between sRGB and AdobeRGB will make a difference to the onscreen gamut?
DELL-Chris M
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September 21st, 2010 16:00
PC Gamma = 2.2
MAC Gamma = 1.8
So yes, there will be a shift in hues. Not sure about the second question. Have you played around with them?
spacematt
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September 22nd, 2010 05:00
Hey Chris thanks for the reply. I think I'd better to come back to the hue/gamma thing as it's quite subtle compared to the main issue...
I understand that the sRGB preset is supposed to limit the display to the sRGB gamut so that it cannot display those super-vivid wide gamut colours. Many sources tell me this is useful when using non-colour managed apps. This makes sense and sure enough, when I set the monitor to sRGB, the super-vivid colours go away. Switch back to AdobeRGB and the super-vivid colours return. Again this makes perfect sense and I would normally be happy with this
The problem is that if the gamma is set to Mac (so that I may view my work in the way that Mac clients will see it), the sRGB mode doesn't appear to work. Colours are still super-vivid, way outside of sRGB gamut. There seems to be no difference whatsoever between sRGB and AdobeRGB modes.
I would love to know if my unit is faulty, the firmware contains a bug, or even better that the problem lies between the screen and the chair. If somebody could run a small test on a U2711 it would help me out greatly...
DELL-Chris M
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September 22nd, 2010 12:00
Response from engineering -
Indeed, non-color managed images will only look correct if they are viewed under the same conditions as they were originally edited under. This problem often plagues web graphics as they generally do not contain embedded color profiles. The obvious way to solve this would be for PC users and Mac users to standardize on the same choice of gamma, and the logical choice would be for both to use gamma 2.2 for the reasons outlined here.
spacematt
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September 24th, 2010 06:00
Hi Chris, thanks again for following up on this. I think the engineering guys may have missed my point a little. They seem to be responding to a more frequently asked question. I'm aware of the principal difference between Mac and PC (2.2 vs 1.8), but for the moment I'm not concerned about it at all. I'm also aware of the problems of untagged images, non colour-managed application etc. They aren't the problem.
My problem is gamut, not gamma. For certain reasons I want the monitor gamma sometimes set to Mac - 1.8 not PC - 2.2. I understand that this will affect the brightness of my display, especially the midtones. I deal with gamma daily at work.
My main problem is this. When gamma on the U2711 is set to 1.8, not only does the gamma change a little but also I cannot select the sRGB gamut. I can activate the sRGB preset mode, but even to the naked eye it looks nothing like sRGB gamut - pure colours are far too saturated. In fact, both sRGB and AbodeRGB presets appear identical to the standard preset. This is not the case if gamma is set to 2.2. With the 2.2 setting, sRGB and AdobeRGB are worlds apart.
I would love to know, if this problem occurs on other units so I can rule out this being unit being faulty and investigate other causes. The problem again:
**When gamma is set to Mac(1.8) the sRGB preset does not activate the sRGB gamut**
Thanks again for your time, I appreciate you have many other threads to attend to.