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# Gammit! An easy to use application for desktop gamma correction

, 21 Jul 2006 CPOL
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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.

## Introduction

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;
Ccount++;
}
}

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

## Conclusions

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

## Share

 Synved Ltd. Ireland

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 Dual Monitors srboisvert27-Jul-06 3:56 srboisvert 27-Jul-06 3:56
 Just out of curiosity does anybody know how to do gamma corrections programmatically on dual monitor systems? With a single window stretched across two screens? I have seperate colour calibration info for each monitor.
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