//*** Get the ADU value at pixel X,Y
public double GetPixelADU(int xPix, int yPix)
{
//get the array height and width
int aHeight = timg.HeightInPixels;
int aWidth = timg.WidthInPixels;
//need to some out of bounds checking here someday
double[] aRow = timg.scanLine(yPix);
double aVal = aRow[xPix];
return(aVal);
}