C# Signature:

    [DllImport("dwmapi.dll", EntryPoint = "#131", PreserveSig = false)]
    private static extern void DwmSetColorizationParameters(ref DWM_COLORIZATION_PARAMS parameters,bool unknown);

Alternative Managed API:

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Notes:

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Please note that this is an undocumented API and as such is not supported by Microsoft and can be changed or removed in the future without futher notice.

Tips & Tricks:

A more reliable approach to set the colorization parameters would be to implement your own method that tries to set each parameter directly in the Windows registry and sends the WM_DWMCOLORIZATIONCOLORCHANGED message to notify all top-level windows about the change, with proper exception handling in the case a value cannot be set. The colorization parameters can be found under the key "HKEY_CURRENT_USER\Software\Microsoft\Windows\DWM". Please note that these are also undocumented and as such can also be changed or removed in the future.

Sample Code:

C# Sample

    [DllImport("dwmapi.dll", EntryPoint = "#131", PreserveSig = false)]
    private static extern void DwmSetColorizationParameters(ref DWM_COLORIZATION_PARAMS parameters,bool unknown);

    private struct DWM_COLORIZATION_PARAMS
    {
        public uint clrColor;
        public uint clrAfterGlow;
        public uint nIntensity;
        public uint clrAfterGlowBalance;
        public uint clrBlurBalance;
        public uint clrGlassReflectionIntensity;
        public bool fOpaque;
    }

    public void SetParameters(object sender, EventArgs e)
    {
        DWM_COLORIZATION_PARAMS temp = new DWM_COLORIZATION_PARAMS();
        temp.clrColor = 1802811644;
        temp.clrAfterGlow = 1802811644;
        temp.nIntensity = 8;
        temp.clrAfterGlowBalance = 43;
        temp.clrBlurBalance = 49;
        temp.clrGlassReflectionIntensity = 50;
        temp.fOpaque = false;

        DwmSetColorizationParameters(ref temp, false);

    }

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