private Bitmap GetBitmapForMiddle(ISegyFile segy, Func <ITrace, int> numberSelector)
{
var imageWriter = new ImageWriter {
SetNullValuesToTransparent = false
};
var numbers = segy.Traces.Select(numberSelector).Distinct();
var index = numbers.Count() / 2;
int middleNumber = numbers.ElementAt(index);
Console.WriteLine("line num: " + middleNumber);
Console.WriteLine("line index: " + index);
var inlineTraces = segy.Traces.Where(t => numberSelector(t) == middleNumber).ToList();
var bitmapPath = Path.GetTempFileName() + ".png";
var bitmap = imageWriter.GetBitmap(inlineTraces);
bitmap.Save(bitmapPath, ImageFormat.Png);
TestContext.AddResultFile(bitmapPath);
return(bitmap);
}