title: Number of columns in "full-width" PSD design
body: <p>I have one PSD design, which 1980px (full-width), and I need to convert it to HTML, using Bootstrap 3. </p>
  
  <p>I do know that Bootstrap 3 has an option to fluid grids, but my question is **how can I count number of columns needed for each section on website? **</p>
  
  <p>If this is that, 1980px design: </p>
  
  <p><img src="https://i.stack.imgur.com/iTCgI.jpg" alt="enter image description here"></p>
  
  <p>How can I know how many columns to set for the black, red, and blue section?</p>