The 4K iMac came out. When this resolution was originally mentioned in the rumors, I was a little confused. 4096 x 2304 is not what all the TV people call 4K, or even what the iPhone 6s and 6s Plus shoot. That 4K is the UHD resolution of 3840×2160. Apple doesn’t ship any display, on any device, that is 3840x2160.
We all watch scaled video, all the time, and that’s no sin. But it would be nice if Apple would ship something that was 1:1. If you watch “4K” video on your “4K” iMac, every pixel is being resampled to scale up by 1.0666.
I am excited about the updates to the range of colors that can be displayed. From Jason Snell’s review for Macworld:
Apple says that the display in this 4K iMac, as well as the revision to the 5K iMac that was announced the same day, offers an expanded color space. Thanks to new red-green phosphor LEDs, the displays can display a wider range of red and green light than before, allowing them to display 25 percent more colors.
In a demo at Apple, I was able to detect subtle differences. The new displays can offer more color detail and more vibrancy than the display on the older 5K iMac models. I’m a little red-green color blind, and even I could detect the differences. If you work in graphics or video, you’ll probably be happy to have access to a display that’s capable of displaying 99 percent of the P3 color space.