Apple Sales Person Acknowledges Yellow Tint - Says Fix Has Been Implemented

[lexvo]

The hue of each area can be measured using photometric sensor (similar principle of operation to the one used for the screen calibration).

I run some tests and present yellow tinge is caused by 5% to 10% blue deficiency, while 2% of yellow tinge wedge is practically unnoticeable.

I'd say that +/-0.5%, or +/-1% uniformity for each color component across the panel would be a good starting point.


Tom B.

Thanks for the reply. I was also thinking about a sensor on the screen. This would mean that every owner with yellow tinge has to take their iMac to a shop or Apple to check the tolerance.

Would it be usable if I take a photo of the screen (with my DSLR) and then measure the hue difference in Photoshop? This would be no exact measurement of course but just an indication how severe the yellow tinge is.

 

[Btom]

Thanks for the reply. I was also thinking about a sensor on the screen. This would mean that every owner with yellow tinge has to take their iMac to a shop or Apple to check the tolerance.

Would it be usable if I take a photo of the screen (with my DSLR) and then measure the hue difference in Photoshop? This would be no exact measurement of course but just an indication how severe the yellow tinge is.

I think it would work. Take a picture of a white sheet of paper (in some uniform, soft light) for comparison. I'd use a quality, medium focal length lens and would place white page and then the screen just in the center of the picture (10% - 20% center area surface, for better uniformity). You could also experiment with slightly de-focusing the lens to avoid moire pattern.

Why you are in Photoshop you can play with saturation and other parameters to amplify the effect and see what else happens on the screen. And let us know.

Tom B.

 

[BelowTheBelt]

I've spoken to an Apple sales person over the phone and was told that the yellow tint had to do with a bad batch of defective screens from the manufacturer. Something about the "chemicals" being used in the screens were bad. States that all new iMacs being shipped will be defect-free.

So...

1) Apple is aware of the problem

2) Apple has found a solution to the problem

3) Apple claims that the new shipments will be yellow-tint free

As far as the delays go, he wouldn't exactly say why, other than its a very popular model. I imagine that the retooling plays a part in the delay.

Hopefully, we'll start hearing reports of the new iMacs being defect-free. Be sure to post if you get a good or bad screen over the next several weeks.

So where is the Apple press release that acknowledges this mate ?
I looked over your post and could only find hearsay from a CSR with Apple.

 

[annk]

The thread title has now been changed...

Carry on.

 

[IndustrialSpace]

The thread title has now been changed...

Carry on.

Thanks.