public SKBitmap combineLightbulbs(SKBitmap outputBmp, SKBitmap lowerImage, SKBitmap upperImage, double pctScale)
{
using (var canvas = new SKCanvas(outputBmp)) {
//canvas.Clear(new SKColor(242,242,242)); // this works.
canvas.Clear(GlobalSingletonHelpers.SKColorFromXamarinColor(GlobalStatusSingleton.backgroundColor));
int y = (int)(pctScale * (double)lowerImage.Height);
SKRect lwrRegion = SKRect.Create(0, 0, lowerImage.Width, y);
canvas.DrawBitmap(lowerImage, lwrRegion, lwrRegion);
SKRect uprRegion = SKRect.Create(0, y + 1, upperImage.Width, upperImage.Height - y);
canvas.DrawBitmap(upperImage, uprRegion, uprRegion);
}
return(outputBmp);
}