Apple combines high-resolution 5K imaging on its sleek 5mm-thick, Mid-2017 27-inch iMac with Retina 5K display. With a screen resolution of 5120 x 2880, this iMac provides 1 billion colors and 500 nits of brightness, which is 43% brighter than the previous model. The Retina 5K display also features a wider color gamut. Using a P3-based color gamut, the Retina 5K display provides a larger color space that more equally represents red, green and blue, compared to standard sRGB displays. And with more colors available, images will appear more vivid and reveal greater detail, with more balance and precision.