Apple has updated its macOS operating system to improve support for **HDR (High Dynamic Range)** screens, a technology that allows for greater contrast and a wider range of colors. Previously, using HDR on devices other than Apple laptops and two specific monitors — the **Pro Display XDR** and the **Studio Display XDR** — often resulted in a less vibrant image. With the release of macOS 27, the operating system now properly renders its interface in **SDR (Standard Dynamic Range)** mode while still allowing HDR content to be viewed with the correct dynamic range. The effectiveness of these changes can vary depending on the monitor being used. In addition to this improvement, Apple has made two other changes to the operating system. The first allows users to switch to HDR mode even when a "pseudo-resolution" is selected in the settings — a resolution that uses a non-integer multiplier. For years, Apple has provided different display modes on **Retina** screens, with a default 2x mode (an integer multiplier) where four physical pixels correspond to one logical pixel (often equivalent to a 1920 x 1080 display on a 4K monitor). Other modes offer different scaling options that may not align perfectly with logical and physical pixels (using a non-integer multiplier). Previously, selecting one of these other modes would prevent HDR from activating, but that is no longer the case with macOS 27. The second change improves a feature introduced with **macOS Sequoia**, which allows users to adjust brightness using a slider when HDR mode is enabled. Since it's now (almost) possible to remain in HDR mode permanently, this feature allows brightness to be adjusted both through software and via Apple keyboard keys. However, the company notes that this adjustment is more of an approximation and may not always be perfectly accurate. These updates reflect Apple’s ongoing efforts to enhance the visual experience on a broader range of displays while addressing technical limitations that previously hindered the use of HDR outside of its own ecosystem. The changes aim to provide users with greater flexibility and control over their display settings, even if some aspects remain imperfect.