title: How to capture website screenshot in high resolution?
body: <p>I want to capture screenshot of a website in high resolution to recognize text  or simply to save high quality images. I tried this code in Python 2.7. The website <a href="http://www.flaticon.com/" rel="noreferrer">http://www.flaticon.com/</a> has been taken merely as example.</p>
  
  <pre><code>from selenium import webdriver
  import time
  driver = webdriver.PhantomJS()
  #Setting large window size doesn`t resolve the problem
  driver.set_window_size(16000, 12000)
  driver.get('http://www.flaticon.com/')
  time.sleep(3)
  #set resolution 640 dots per inch for this image 
  #???
  driver.save_screenshot('./downloaded/img/welcome_icons.png') # save a screenshot to disk
  driver.close()
  </code></pre>
  
  <p>It captures screenshot, but the resolution is not enough for me. Enlarging window size doesn`t resolve the problem. The picture from webside reside only on the part of the image. It seems that image resolution is not affected.
  Is there some way to explicitly set image resolution before saving it?</p>