Leopard seems to have helped with uneven gradients

[SaSaSushi]

I too concur that every 20" iMac I have seen has a slight but noticeable vertical gradient, that I wonder if it is caused by viewing angles on a low-quality panel.

And since we are talking about photographic memories here, here is the conveniently forgotten about side-by-side of left/right screen edges of Leon's supposedly perfect, "upgraded" white iMac from his web photos. Folks - give this man no credibility. He is hell-bent on bashing the iMac and making false claims that every single iMac is defective, even based on evidence of gradients in photos that shows up in his own self-proclaimed perfect iMac. At what point is it fair to conclude that a perfect screen *just might* photograph less than perfectly, when even the main scrutinizer of these photos has a gradient in his own photo of his own perfect screen????

Nevermind that small fact but the images he is using as the perfect example of a MASSIVELY gradient-affected display are from pictures I offered of my own 24" alumimac.

That photo was taken in the daylight in a room with the shades drawn and just coincidentally the much lighter left hand side of the screen is on the side of the Mac closest to a window through which bright sunshine was shining through the curtains. The side that is darker is next to nothing but a wall.

I suggest Leon and all others who might be buying his BS refer to the photos submitted of the blank white wall. He refuses to accept that other factors might account for gradient-effects that appear on displays captured in digital photography and is still recommending that measuring said photos with DigitalColor Meter.app is a scientific way to prove display "defects". Don't believe his crap.

Let your own eyes be the judge. If any prospective 24" aluminum iMac buyers in here are believing the horse manure Leon and others like him shovel in here without actually viewing one for themselves then they deserve not to own one.

My screen has no gradient issues anywhere near what gets captured on the digital photographs. I'm not saying it's 100% perfect but it's close.

 

[psonice]

As clearly stated in every post I've made on the subject, my only claim WRT my 20" iMac is that its MAX:MIN brightness differences are no larger than 20% -- according to direct, screen-contact light meter readings.

The comedy continues... you ridiculed my photo of my (fine looking) 24" alu imac screen that showed a strong gradient, and chose to ignore the gradient in EXACTLY the same position on the aluminium itself. And what were my actual measurements of the screen gradient? The MAX:MIN brightness differences are no larger than 20% -- according to direct, screen-contact light meter readings.

Yes, your white imac is just as "defective" as my aluminium one.

 

[czachorski]

Still tryin' to sell that same ol' lame ol' "perfection" straw man? That's a smokescreen entirely of your own invention. As clearly stated in every post I've made on the subject, my only claim WRT my 20" iMac is that its MAX:MIN brightness differences are no larger than 20% -- according to direct, screen-contact light meter readings. Your side-by-side slices from my picasaweb photos strongly support the 20% claim, and if anything, suggest that it was overly conservative. Feel free to analyze any of the photos -- by any means you wish.

http://picasaweb.google.com/TheLooby

A brightness difference of 20% is well within Apple's (TCO'03) spec for the 20" Cinema Display (which uses exactly the same LCD panel as my iMac) -- or any other ACD, for that matter. All displays are "imperfect," but all "imperfections" are not created equal...

...tune-in Sesame Street for a refresher course on "big" and "little,"

LK

And these tolerances are also met by my 24" iMac, my 20" ACD, and my white wall. If "perfect" is my strawman, then why do you keep criticizing photos that clearly fall within your own stated tolerances? You criticize them and claim gradient issues, when they meet the same specs, and look the same as your own white iMac, and then get all defensive when the word "perfect" is used. It is coming from your own points and your own argument.

pechspilz - read my posts more carefully - I too concur that every single 20" iMac has a slight but obvious vertical gradient issue, and I wonder if it is caused by low quality panel viewing angles. I have said that all along. When talking about horizontal brightness, and my reference to percentages, we are talking about the 24" iMacs. My apologies if I did not state that with every single sentence where I mention a percentage.

 

[Kuska]

Just try this - You'll soon know if you have a problem with your screen - not very technical but it does show up the gradient and/or backlighting issues fairly clearly. If there is a reason why this test would be the wrong way to perceive gradients, please let me know.

"OK, best way I've discovered to tell is to set to the Grey background.

Position your pointer at one point of the screen - click and drag a rectangle or letterbox shaped box, - you'll soon see if you have a gradient issue - just compare left to right or up to down. - To be clear the issue will be noticeable inside the box you've just dragged. "

 

[qom]

Not sure if this should go here.
But got my second replace mac the day before yesterday, had problem before with stuck/dead pixels.

This machine seems better in that sense.
But I have discovered that when the screen is dark/black there's some white/yellowish at the very bottom of the screen.

Pretty annoying when you know it's there.
Not sure if I should return this one too, would you?

 

[mavis]

I too concur that every 20" iMac I have seen has a slight but noticeable vertical gradient, that I wonder if it is caused by viewing angles on a low-quality panel.

And since we are talking about photographic memories here, here is the conveniently forgotten about side-by-side of left/right screen edges of Leon's supposedly perfect, "upgraded" white iMac from his web photos. Folks - give this man no credibility. He is hell-bent on bashing the iMac and making false claims that every single iMac is defective, even based on evidence of gradients in photos that shows up in his own self-proclaimed perfect iMac. At what point is it fair to conclude that a perfect screen *just might* photograph less than perfectly, when even the main scrutinizer of these photos has a gradient in his own photo of his own perfect screen????

hahaha ... Oh, man - that's classic!!

I'm so sick of this Leon character carrying on and on about uneven lighting, I mean he's like a broken record. It's just kind of irritating, like a mosquito buzzing around your ear when you're trying to sleep at night ... To find that his own 'perfect' screen looks as bad or worse than the iMacs he's bent on trashing is just too funny. Thank you for posting that!!