HueShift

A small native macOS utility that applies a true hue rotation to the entire captured display.

Requirements

• Apple Silicon Mac
• macOS 15 or later
• Xcode Command Line Tools (xcode-select --install)

Build

From Terminal:

cd /path/to/HueShift
./build.sh

The app asks for Screen Recording permission. Enable it in:

System Settings > Privacy & Security > Screen Recording

Then quit and relaunch HueShift.

Use

The utility captures each display, applies Core Image's CIHueAdjust filter, and displays the result in a full-screen window. The control window provides a -180° to +180° slider.

Important limitations

This is a software display filter, not a WindowServer or GPU display-pipeline hook.

• Screen Recording permission is required.
• There is capture/render latency.
• Protected content that macOS does not expose to ScreenCaptureKit cannot be transformed.
• HDR and wide-gamut behavior can differ from the native display pipeline.
• The mouse cursor is captured and transformed as part of the frame.
• The output window ignores mouse events, so normal mouse input passes through to applications underneath.
• The app can consume significant GPU bandwidth at high-resolution 60 Hz capture.

Core Image's CIHueAdjust performs the desired color-cube rotation. Apple documents its angle parameter in radians.