Got a tip for us?
Let us know
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
27", 21.5" iMac Owners, test your screen for yellow tint issue here
- Thread starter tapplox
- Start date
- Sort by reaction score
are they that quick....... is there a chance mines flickering and im unaware? as mines on all day but im not always sat at it while its working away
Well, since I posted that I've seen a total screen blackout (about half a second) and several more flickers. They're usually very fast, and yes, if you're not in front of your machine you could well be unaware that it is doing it.
http://www.youtube.com/watch?v=ND9-aNr_fQ0
That's a video of my original doing the flicker and the blackout. Some flickers are even faster than that.
I got my i7 3 days ago and it doesn't seem to have any problems.
None of this screen bleeding or anything, no yellow tinge (unless im utterly blind).
Really pleased. I have noted that some peoples 27's have been going bad after extended use but if this happens I will be posting back.
It's a week 51 i7 by the way. My first MAC - Why didn't I make the change years ago :'( Everything seems to just... work.
None of this screen bleeding or anything, no yellow tinge (unless im utterly blind).
Really pleased. I have noted that some peoples 27's have been going bad after extended use but if this happens I will be posting back.
It's a week 51 i7 by the way. My first MAC - Why didn't I make the change years ago :'( Everything seems to just... work.
Method to measure yellow tint DOES NOT WORK- SKIP
SORRY GUYS, THIS METHOD DOES NOT WORK. DO NOT READ
I have an i7 and have been reading this thread for weeks. I believe that the following procedure accurately measures any discoloration of the screen.
1) If this method has already been presented, please accept my apology and read no further.
2) You need Photoshop to do this procedure.
3) IF SOMEONE SEES A FLAW IN MY PROCEDURE, PLEASE LET ME KNOW AND I WILL RETRACT IT. I AM ONLY TRYING TO HELP.
4) If you have an obvious discoloration, don't waste your time. I think that I was lucky and have a good screen (so far). So this procedure is for people who are not 100% sure what they have.
5) If possible, calibration your screen first with one of those sensors that attaches to the front of your screen.
Steps to Procedure:
1) Get the gray bars on your screen as explained in the first post of the thread starter. Or you can use any solid color or all white.
2) Take a screen shoot of your screen. Use Command+Shift+4 and you will get a cursor that will allow you to select only the pertinent part of your screen as shown here:
http://att.macrumors.com/attachment.php?attachmentid=209382&stc=1&d=1262447694
3) Open the screen shoot in Photoshop and make sure you turn on the info palette under the window drop down menu. Then select the eyedropper tool.
4) Move the eyedropper tool around. If your red, green, and blue numbers are the same, it means that you have no tint. If they are not the same, then you have a tint. See below:
http://att.macrumors.com/attachment.php?attachmentid=209383&stc=1&d=1262448070
Upon previewing this post, I can see that the numbers in the info palate did not transfer into this post. I assure you that they are on my screen. BTW, if your RGB is 0,0,0, that is 100% black. If 255, 255, 255, that is 100% white.
I really am not sure this procedure is sound. If anyone with an obvious tint could try this and let me (everyone) know your results. This would verify if it works.
Thanks for your time.
SORRY GUYS, THIS METHOD DOES NOT WORK. DO NOT READ
I have an i7 and have been reading this thread for weeks. I believe that the following procedure accurately measures any discoloration of the screen.
1) If this method has already been presented, please accept my apology and read no further.
2) You need Photoshop to do this procedure.
3) IF SOMEONE SEES A FLAW IN MY PROCEDURE, PLEASE LET ME KNOW AND I WILL RETRACT IT. I AM ONLY TRYING TO HELP.
4) If you have an obvious discoloration, don't waste your time. I think that I was lucky and have a good screen (so far). So this procedure is for people who are not 100% sure what they have.
5) If possible, calibration your screen first with one of those sensors that attaches to the front of your screen.
Steps to Procedure:
1) Get the gray bars on your screen as explained in the first post of the thread starter. Or you can use any solid color or all white.
2) Take a screen shoot of your screen. Use Command+Shift+4 and you will get a cursor that will allow you to select only the pertinent part of your screen as shown here:
http://att.macrumors.com/attachment.php?attachmentid=209382&stc=1&d=1262447694
3) Open the screen shoot in Photoshop and make sure you turn on the info palette under the window drop down menu. Then select the eyedropper tool.
4) Move the eyedropper tool around. If your red, green, and blue numbers are the same, it means that you have no tint. If they are not the same, then you have a tint. See below:
http://att.macrumors.com/attachment.php?attachmentid=209383&stc=1&d=1262448070
Upon previewing this post, I can see that the numbers in the info palate did not transfer into this post. I assure you that they are on my screen. BTW, if your RGB is 0,0,0, that is 100% black. If 255, 255, 255, that is 100% white.
I really am not sure this procedure is sound. If anyone with an obvious tint could try this and let me (everyone) know your results. This would verify if it works.
Thanks for your time.
Attachments
Bob, I've said this before, so I'm surprised I have to say it again - the yellow tinge is a problem with the physical display. Taking a screen shot is only going to capture what the computer THINKS it is displaying on the screen, which it in turn THINKS is perfect. There will be NO difference between the screenshot and what you opened in photoshop because the screenshot WILL NOT capture what is ACTUALLY PHYSICALLY on the screen, only what is being SENT to the screen.
You actually need to PHOTOGRAPH the screen in order to showcase the issue.
You actually need to PHOTOGRAPH the screen in order to showcase the issue.
Maybe I read this wrong, but your saying screen shot the yellow 'tinge'? If so, surely you would have to use a camera to do this as the problem is with the display and not the actual working of the computer?
**EDIT: What Knewsome said ^^
Err, that wouldn't work. Screenshots rely on taking the digital data that the GPU is outputting, and capturing it. As such, the GPU is telling the display "Be White" at a certain point, and that is what the screenshot gets, and shows via Photoshop.
The tint however, is the display, not the GPU. PS will tell you that the area is white, but the display is changing that to yellow, but in a step after the screenshot is taken. Cameras are the only way to capture it, as they come after the display adds its effect.
I experienced my first flicker last night. It was in the lower left hand corner of the screen and I wouldn't have even noticed it if I wasn't looking directly at that portion of the screen. This one has the yellow tinge as well (as did the first one). Jeez I wonder if my third iMac will have the yellow tinge as well?
I have a week 38 iMac 27-inch Core 2 Duo and never really noticed the yellow tinge for the full almost 2 months I've had the machine but thanks to this thread it is pretty obvious that when looking at the boxes full screen the bottom two have quite a bit of yellow in it.
Is it easy enough to schedule an appointment at the Apple store and get it replaced?
Is it easy enough to schedule an appointment at the Apple store and get it replaced?
Photo of Screen Problem
Well my screen shot method went down in flames. Thanks for your understanding HenryZ. I have been trying to take a photograph of my screen and I keep getting a moire pattern that makes it impossible to measure the color. I have a good Nikon camera set at 1/80 second at f3.5. Any suggestions would be appreciated.
Well my screen shot method went down in flames. Thanks for your understanding HenryZ. I have been trying to take a photograph of my screen and I keep getting a moire pattern that makes it impossible to measure the color. I have a good Nikon camera set at 1/80 second at f3.5. Any suggestions would be appreciated.
Attachments
Won't it help if you change the distance between the camera and the screen?
Or else, try a longer shutterspeed. I don't know about LCD-screens, but with CRT's the shutter had to be slower than 1/50 or so.
Photo of screen problem
Thanks for your response. I just tried 1/15 of a second at 24 mm so I was only 1.5 feet from the screen. I can see the moire pattern in the viewfinder, so I think it is a reaction between the screen and something about this particular camera (Nikon D3). I will borrow a point and shoot camera and try again.
Thanks for your response. I just tried 1/15 of a second at 24 mm so I was only 1.5 feet from the screen. I can see the moire pattern in the viewfinder, so I think it is a reaction between the screen and something about this particular camera (Nikon D3). I will borrow a point and shoot camera and try again.
Photo of Screen Problem
Well, I solved my moire problem by taking the photo out of focus. My eyes and Photoshop both say that I don't have a yellow area, but the bottom is slightly lighter than the top. Good enough to keep my i7, unless things change.
I am new to Macs as of about two years ago. I switched because of Apple's reputation. I hope they make all these iMac problems go away properly. The people on these forums seem to be the core of the serious Mac owners. I believe that they need to be well handled by Apple.
Well, I solved my moire problem by taking the photo out of focus. My eyes and Photoshop both say that I don't have a yellow area, but the bottom is slightly lighter than the top. Good enough to keep my i7, unless things change.
I am new to Macs as of about two years ago. I switched because of Apple's reputation. I hope they make all these iMac problems go away properly. The people on these forums seem to be the core of the serious Mac owners. I believe that they need to be well handled by Apple.
Attachments
BobK, in the picture you posted, it looks to me like the right edge is more yellow than the rest of the image, particularly toward the bottom. Is it possible that it just looks that way because it's darker in those areas?
Are you talking about his second picture? It looks like that one wasn't taken straight on. His first one looks great.
BobK's screen photos
Thanks for the feedback. You are both right. The first photo was taken straight on with the camera on a tripod using a 200mm lens about 15 feet away. But in sharp focus I get an annoying moire effect. If you click on the thumbnail you will see it. It makes it impossible to read it with the Photoshop info tool. The second picture was taken handheld at an angle with a 14mm lens at about 1.5 feet and purposely out of focus to get rid of the moire effect. I am just hoping that someone at Apple takes this forum seriously and sees that we are all trying for the common good. Which would be Apple products that we are proud to own. Even though my screen seems to be good, this thread is loaded with unrefutable evidence that a significant number of people have substandard machines. Although there are far more serious things in life to worry about, owning a Mac is something that gives me a little break from it all.
Thanks for the feedback. You are both right. The first photo was taken straight on with the camera on a tripod using a 200mm lens about 15 feet away. But in sharp focus I get an annoying moire effect. If you click on the thumbnail you will see it. It makes it impossible to read it with the Photoshop info tool. The second picture was taken handheld at an angle with a 14mm lens at about 1.5 feet and purposely out of focus to get rid of the moire effect. I am just hoping that someone at Apple takes this forum seriously and sees that we are all trying for the common good. Which would be Apple products that we are proud to own. Even though my screen seems to be good, this thread is loaded with unrefutable evidence that a significant number of people have substandard machines. Although there are far more serious things in life to worry about, owning a Mac is something that gives me a little break from it all.
Just purchased wk51 i5, yellowed.
Decided to dive into the iMac pool and got dreaded yellow tint, wk51 27" i5 iMac has yellowing most pronounced in the lower right corner.
Plan to visit the store next week to see about an exchange since this is a bit annoying (I'm in the visual effects industry) but wanted to post my pics for the record. First one taken with the GF1 using the 20mm/f1.7, 100iso at 1/500 with no ambient light, screen at full luminosity, unretouched. Second pic only has the saturation cranked.
Decided to dive into the iMac pool and got dreaded yellow tint, wk51 27" i5 iMac has yellowing most pronounced in the lower right corner.
Plan to visit the store next week to see about an exchange since this is a bit annoying (I'm in the visual effects industry) but wanted to post my pics for the record. First one taken with the GF1 using the 20mm/f1.7, 100iso at 1/500 with no ambient light, screen at full luminosity, unretouched. Second pic only has the saturation cranked.
Attachments
Mine is a 21,5" iMac with HD4670 graphics built week 44. The bottom is more yellow and after having done this test I can see it using finder, with single-colored backgrounds etc.
I bought this in november from a Premium Reseller in town (we don't have physical Apple Stores in Sweden). Should I return it to them or give Apple a call? I activated Apple Care for it last week.
I bought this in november from a Premium Reseller in town (we don't have physical Apple Stores in Sweden). Should I return it to them or give Apple a call? I activated Apple Care for it last week.