21.5-inch iMac with Retina 4K display

The introduction of the Retina display into the 21.5-inch iMac fills out the Retina iMac line that formerly featured only a pair of 27-inch models with Retina 5K displays.

The Retina 4K display sports a resolution of 4096 by 2304 resolution—that’s over 9.4 million pixels on the screen, which is 4.5 times the number of pixels that appear on the standard 21.5-inch iMac and its 2 million pixels.

The Retina 4K display also features a P3-based colour gamut that Apple says provides a 25 per cent larger colour space, leading to better image detail and colour accuracy. P3 is a colour output standard for digital cinema – and Apple hasn't revealed how much of the common standard for professional creative tools it can output – Adobe RGB, as used by Creative Cloud tools such as Photoshop or After Effects.

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