Update README.md

ledoge · Nov 9, 2021 · 6714309 · 6714309
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 # About
-This tool applies 3D LUTs to the Windows desktop by hooking into DWM. It works in both SDR and HDR modes, and uses tetrahedral interpolation. In SDR, ordered dithering is applied to the output to reduce banding.
+This tool applies 3D LUTs to the Windows desktop by hooking into DWM. It works in both SDR and HDR modes, and uses tetrahedral interpolation on the LUT data. In SDR, ordered dithering is applied to the output to reduce banding.
 
 Right now it should work on any 20H2 or 21H1 build of Windows 10, and also the current build of Windows 11, and I'll try to update it whenever a new version breaks it.
 
 # Usage
-Use DisplayCAL or similar to generate .cube LUT files of any size, run `DwmLutGUI.exe`, assign them to monitors and then click Apply.
+Use DisplayCAL or similar to generate .cube LUT files of any size, run `DwmLutGUI.exe`, assign them to monitors and then click Apply. Note that LUTs cannot be applied to monitors that are in "Duplicate" mode.
 
 HDR LUTs must use BT.2020 + SMPTE 2084 values as input and output.