hello,
i would like to know if it is possible to read pixels,
from an minimized application.
And show them on a picture box in my app.
If somebody know this, please tell me how, where to start or give me an example.
Thank you very much
Chris 
Read pixel from other application?
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Read pixel from other application?
xRuntime
You can get The pixel from another application with help of some API call
There are two approach
First Method:
Capture forground window Then Create Bitmap from it then use
Managed Bitmap class to read pixel from it some thing like
Bitmap bmp=etDesktopWindow();
Color color=bmp.GetPixel(Cursor.Position.X,Cursor.Position.Y);
For an example for this method look at
How to use Visual C# to obtain the color of the pixel that is referenced by the mouse pointer
Seconed Method :
Calling GetPixel() API For an example for how to do it in C++ you can easly convert it to c# with help with
www.PInvoke.net look at
A method to get the pixel color under the mouse pointer