title: plot Intensity profile row by row for an image
body: <p>I know how to extract intensity profile along a particular line of an image using <code>profile_line</code> function in skimage module. For example I have an image having dimensions 1024X1024, I simply use the following code to extract intensity profile along pixel corresponding to 500th row.</p>
  <pre><code> from skimage.measure import profile_line
   image=io.imread('sample.jpg') #read sample image
   profile = profile_line(image,(500,2),(500,image.shape([1])) # intensity profile at row corresponding to pixel position 500 
   plt.plot(profile) #plot of intensity profile
  </code></pre>
  <p>Now, I want to plot intensity profile at each row and save maximum value of intensity profile at each row in a variable called max_I. I have written a sample code, but I have to change index every time to get intenstity profile for each row, which means i have to type 0 - 1024 to get intensity profile at each pixel row. Can this code be improved, so that I don't have to physically type in the rows.</p>
  <pre><code>array=[list(range,Image.shape[0])] #create an array having entries from 1 to 1024 (height of image)
  for sublist in array:
      intensity_profile=profile_line(I,(sublist[0],2),(sublist[0],I.shape[1])) # intensity profile at first pixel row
      plt.plot(intensity_profile)
      plt.show()
  </code></pre>