Plot an image without any pixel resampling

plot_pixels.py

def plot_pixels(D, zoom=1, dpi=64, x0=0, y0=0, **args):
    ny, nx = D.shape
    width, height = zoom * nx, zoom * ny
    fig = plt.figure(figsize=(width / dpi, height / dpi), dpi=dpi, frameon=False)
    ax = plt.axes((0, 0, 1, zoom * ny / height))
    extent = [x0 - 0.5, x0 + nx - 0.5, y0 - 0.5, y0 + ny - 0.5]
    ax.imshow(D, extent=extent, **args)
    ax.axis('off')
    return fig, ax