https://resources.arcgis.com/en/help/arcobjects-net/componentHelp/001q/001q00000896000000.htm
IPixelFilter.GetSize Method (ArcObjects .NET 10.1 SDK)
getsizemethodsdk
https://resources.arcgis.com/en/help/arcobjects-net/componentHelp/001q/001q00000889000000.htm
IPixelFilter.Filter Method (ArcObjects .NET 10.1 SDK)
filtermethodsdk