Change map contrast/brightness

Question

Hi all, 
I have a project using latest version of ArcGIS SL client API that connects to an ArcGIS Server .net 10. I'm using ArcGISImageServiceLayer and ArcGISDynamicMapServiceLayer classes to shows some map layers.
Is there a way to allow users change at runtime contrast/brightness of resulting images? They need to identify some objects on these maps and this functuonality would be very useful.

Thanks,
Adolfo Marinucci

SomeGISGuy · Answer

There's an effect property on the layer that you can use for this. There are effects out there that allows you to control contrast and/or brightness.
You can for instance use this effects library: http://wpffx.codeplex.com/ 
 
Note that these effects often comes with a big performance penalty, so use them wisely.

AdolfoMarinucci · Answer

Thanks for your answer, but what I'm looking for is how to change the contrast/brightness  of the image downloaded not the opacity of the layer. We're working with aereal photos and improving their contrast/brighteness could help our users to identity objects present on the map.

Adolfo

AliMirzabeigi · Answer

Hi Adolfo, You can use the following code snippet to change the opacity of an image service layer based upon the value of a Slider control: And in the code-behind: public MainPage() { InitializeComponent(); MyMap.Layers.LayersInitialized += new LayerCollection.LayersInitializedHandler(Layers_LayersInitialized); } void Layers_LayersInitialized(object sender, EventArgs args) { MySlider.ValueChanged += MySlider_ValueChanged; } private void MySlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs e) { (MyMap.Layers[1] as ArcGISImageServiceLayer).Opacity = MySlider.Value; }