Gradient direction not consistent (X vs Y) for an image
In order to correct for the y-axis being reversed, the quiver plot needs a negative in front of the Iy term.plt.quiver(X,Y, Ix2,-Iy2, color='r')
In order to correct for the y-axis being reversed, the quiver plot needs a negative in front of the Iy term.plt.quiver(X,Y, Ix2,-Iy2, color='r')