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v1 Color Temperature Control#1828

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claycantrell wants to merge 1 commit intoMonitorControl:mainfrom
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Open

v1 Color Temperature Control#1828
claycantrell wants to merge 1 commit intoMonitorControl:mainfrom
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@claycantrell
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@claycantrell claycantrell commented Jan 7, 2026

Add Color Temperature Control via DDC

Summary

  • Adds a new Color Temperature slider to MonitorControl that adjusts display warmth/coolness via DDC commands
  • Implements color temperature by modulating Video Gain Red and Video Gain Blue DDC values
  • Adds UI toggle in App Menu preferences to show/hide the Color Temperature slider
  • Includes groundwork for per-display advanced settings for Color Temperature (DDC min/max overrides, curve, invert, remap)

How It Works

The color temperature control uses a simplified Kelvin-to-RGB approach:

  • Slider at 0 (Cool/~9300K): Red gain = 40, Blue gain = 70
  • Slider at 0.5 (Neutral/~6500K): Red gain = 50, Blue gain = 50
  • Slider at 1 (Warm/~2700K): Red gain = 60, Blue gain = 30

This creates an asymmetric adjustment where blue changes more dramatically than red, mimicking real color temperature behavior.

Files Changed

File Changes
MonitorControl/Enums/PrefKey.swift Added showColorTemperature preference key
MonitorControl/Support/MenuHandler.swift Added Color Temperature slider to menu (between Volume and Contrast)
MonitorControl/Support/SliderHandler.swift Implemented DDC write logic using videoGainRed/videoGainBlue
MonitorControl/View Controllers/Preferences/MenuslidersPrefsViewController.swift Added checkbox to toggle Color Temperature slider visibility
MonitorControl/UI/Base.lproj/Main.storyboard Added "Show color temperature slider" checkbox in App Menu preferences
MonitorControl/View Controllers/Preferences/DisplaysPrefsCellView.swift Added IBOutlets for per-display Color Temperature advanced settings
MonitorControl/View Controllers/Preferences/DisplaysPrefsViewController.swift Added enable/disable logic for Color Temperature controls
MonitorControl/Model/OtherDisplay.swift Fixed edge case where maxDDC ≤ minDDC would cause division issues
MonitorControl/UI/en.lproj/Localizable.strings Added "Color Temperature" localization string

Known Limitations

  • Per-display advanced settings UI (DDC min/max, curve, invert, remap) for Color Temperature not yet wired in storyboard - IBOutlets are ready but UI elements need to be added in Interface Builder
  • Color temperature uses Video Gain Red/Blue which may not be supported on all monitors

@waydabber
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waydabber commented Feb 9, 2026

Hi there,

thanks for creating this PR and contributing to improve the app!

for some reason I get a validation failed: Couldn't parse property list because the input data was in an invalid format error in ./UI/cs.lproj/Localizable.strings

As you mention, the solution is not yet complete. I recommend wiring everything in properly - and by default these features should be disabled (as many displays don't properly support it and many don't need it, so the app's simple basic brightness/contrast/volume focused profile should not change too much).

@waydabber waydabber added the in progress Issue currently being worked on label Feb 9, 2026
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@claycantrell @waydabber