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Posted 21 Jul 2006

Gammit! An easy to use application for desktop gamma correction

, 21 Jul 2006
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It's a simple application to save the gamma correction level and reset the saved value with only one click. Values are stored in the registry. Some options are available as well.

Gammit! Dialog Shot


I own an LCD monitor, and the default CRT gamma level makes it too bright for me. For various reasons, some application or situation can set the gamma level of my monitor to this value, ignoring my settings, and each time I must open Catalyst (which needs time to start, and consumes a huge quantity of memory) to readjust the settings. So I decided to find something to save my gamma correction level and which would let me restore the saved value with only a click (on the taskbar area would be perfect). Searching on CodeProject for some solution took me to this article: Gamma correction slider by Dany Cantin. Yes, it did the work but not as I wanted. First, I tried to edit the code, but then I found that a from-0 solution would be easier. So I did it.

The Code

I made the application in .NET 2.0, using C#. It was very easy and fast, and the program did its dirty work well. As you can see, in the code, I re-used the Dany routine to calculate the SetGammaRamp argument, starting from the gamma level. I know it isn't a long or hard code, but I've used it because it works and so it would be stupid to rewrite it and waste time.

For seting the value..

for (int i = 0; i < 256; i++)
    ramp[i] = ramp[i + 256] = ramp[i + 512] =
    (UInt16)Math.Min(65535, Math.Max(0, 
            Math.Pow((float)((i + 1) / 256.0), 
            (float)Gamma) * 65535 + 0.5));

and to get it:

float[] rgb = { 1.0f, 1.0f, 1.0f };

for (int i = 0; i < 3; i++)
    float Csum = 0.0f;
    int Ccount = 0;
    int min = 256 * i;
    int max = min + 256;

    for (int j = min; j < max; j++)
        if (j != 0 && _RampSaved[j] != 0)
            double B = (j % 256) / 256.0;
            double A = _RampSaved[j] / 65536.0;
            float C = (float)(Math.Log(A) / Math.Log(B));

            Csum += C;

    rgb[i] = Csum / Ccount;
return rgb[0];


So, that's all, I think. I hope you'll find it useful, bye!


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Elia Sarti
Synved Ltd.
Ireland Ireland

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GeneralDual Monitors Pin
srboisvert27-Jul-06 3:56
membersrboisvert27-Jul-06 3:56 

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