For creating a region:
LBitmapRgn::SetRgnColorHSVRange
LBitmapRgn::SetRgnColorRGBRange
For working with the current region:
LBitmap::GetRgnPerimeterLength
LBitmapRgn::CreateMaskFromBitmapRgn
LBitmapRgn::GetClipSegmentsMax
Raster .NET | C API | C++ Class Library | JavaScript HTML5
Document .NET | C API | C++ Class Library | JavaScript HTML5
Medical .NET | C API | C++ Class Library | JavaScript HTML5
Medical Web Viewer .NET