iMac Retina 5K Display changes tones when waking from sleep -- Is this normal?

Same thing happening on my custom i7 4.0. The yellow tint was/is still a shocker. i am also struggling to accept the noice of the fans when running any game. Bioshock kicks them in even on the Menu page. I am comparing the color shift with my iMac 2012 which is very bluish compare to retina and also has much stronger backlight - almost 2 bars better. On the other hand, retina iMac has much better contrast. . Unfortunatelly the black is not black and when restarting iMac retina I even see some light leaking on edges of the display,

How many times do we have to learn not buying first gen product ((. I thought rock solid iMac design and retina on macbooks already fined tumed . . this can't go wrong. I am on my 2nd day and really considering of sending this machine back. Only if Apple can assure us, the colloring will improve during time and fans will be switch on only when temperatures are higher, I might reconsider.

I just heard back from Apple Care, and they think the color change might be an issue connected to having either Creative Cloud, battle.net or Chrome installed. I've got all three, so yeah. I'm gonna try to install OS X on a external hard drive to see if that removes the issue and if it does, then it's obviously a software issue. If not, well – back to square one.

No luck. Tried, but nothing changed, really. Same thing occurred. I emailed Apple Care about it just now. I guess I'll just have to wait and see what they say.

This is hardly a well taken photo, but yeah. It's a comparison between a few seconds before the color adjustment and right after.

To be quite honest though, I'm thinking that the adjustment might actually improve the colors, heh.

Does the same on mine i7, 4.0. But I have to be honest - I pretty like the color tones of those 2seconds before the profile gets applied. And comparing my late 2012 iMac and my iPhone 5s screen, thats exactly what those machines are set to. More cooler and bluish tone. I wish I could fine tune the color calibration to my liking, but I can adjust the colors, not overall feel - which in our case is sepia/tint.

One thing it does is brighten up the image a bit. Shadowy parts become more visible after the tone change.

Anything new, anyone?

I have this same issue with my iMac 5K. I was wondering if anyone ever figured it out?

I actually exchanged my iMac to a new one with a flash drive instead of a fusion drive. The issue remains, so I'm beginning to think that it's quite normal.

I just received my iMac 5K display and when waking up from sleep mode, it does a weird thing that I never seen on a mac before. When waking up from sleep the display takes a longer time to wake up first of all then my other macs, and then when it finally starts to light up it seems to pause slightly half way thru and then continues on to light up the whole way thru and then it seems to pause again and then adds the calibration to change the colors of the display. I brought it to an apple certified technicien at Jump + which is an Apple premium reseller and he saw the problem but didn't have an explanation, so he tried the demo iMac 5K display that they have on the sales flore and it did the same thing. Do you any of you have the same issue.

My iMac has the 4Ghz processor and the 4GB Radion video card with 24GB RAM with a 512 SSD

Thanks for your help.

iMac, OS X Yosemite (10.10.1), iMac 5K display upgraded model.

Same issue here on a 4GHz/R295/512SSD. It's a little bit annoying for the price we paid...