title: Matplotlib - unable to save image in same resolution as original image
body: <p>I am unable to save the image without the white borders and at the initial resolution (<code>1037x627</code>)</p>
  
  <pre><code>import numpy as np
  import matplotlib.pyplot as plt
  from matplotlib import pyplot, lines
  import matplotlib.image as mpimg
  from matplotlib.patches import Ellipse
  x=[0,0,0,0,0]
  y=[0,0,0,0,0]
  a=10**1.3*15
  inc=25
  b=np.cos(np.radians(inc))*a
  x[0],y[0]=516.667,313.021
  x[1],y[1]=x[0]-a,y[0]
  x[2],y[2]=x[0]+a,y[0]
  x[3],y[3]=x[0],y[0]+b
  x[4],y[4]=x[0],y[0]-b
  for pa in range(0,10,5):
      fig, ax = plt.subplots()
      img=mpimg.imread('IC342.png')
      imgplot = plt.imshow(img)
      x[1],y[1]=x[0]-a/2*np.cos(np.radians(pa)),y[0]-a/2*np.sin(np.radians(pa))
      x[2],y[2]=x[0]+a/2*np.cos(np.radians(pa)),y[0]+a/2*np.sin(np.radians(pa))
      x[3],y[3]=x[0]+b/2*np.cos(np.radians(pa+90)),y[0]+b/2*np.sin(np.radians(pa+90))
      x[4],y[4]=x[0]-b/2*np.cos(np.radians(pa+90)),y[0]-b/2*np.sin(np.radians(pa+90))
      ell = Ellipse(xy=[516.667,313.021], width=a, height=b, angle=pa, edgecolor='b',lw=4, alpha=0.5, facecolor='none')
      name='plt'+str(pa)+'.png'
      leg='PA='+str(pa)
      #ax.text(10, 10, leg, fontsize=15,color='white')
      ax.add_artist(ell)
      xn=[x[1],x[2],x[0]]
      yn=[y[1],y[2],y[0]]
      xnw=[x[3],x[4],x[0]]
      ynw=[y[3],y[4],y[0]]
      line = lines.Line2D(xn, yn, linestyle='-.',lw=5., color='r', alpha=0.4)
      line1 = lines.Line2D(xnw, ynw, linestyle='-.',lw=5., color='g', alpha=0.4)
      ax.add_line(line)
      ax.add_line(line1)
      plt.axis('off')
      fig.savefig(name, transparent=True, bbox_inches='tight', pad_inches=0,dpi=150 )
  </code></pre>
  
  <p>initial image</p>
  
  <p><a href="https://i.stack.imgur.com/2HqPv.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/2HqPv.jpg" alt="Initial img"></a></p>
  
  <p>Result  </p>
  
  <p><a href="https://i.stack.imgur.com/fYvwj.png" rel="noreferrer"><img src="https://i.stack.imgur.com/fYvwj.png" alt="Resulting img"></a></p>
  
  <p>Also I need the white text <code>PA=something</code> to be on the image without changing the resolution. From what I understand adding another figure like text might automatically change the resolution.</p>
  
  <p>Thank you for your time!</p>