title: How to increase the size of labels of a legend for a raster and make them bold?
body: <p>I want to plot a raster file.</p>
  
  <pre><code>library(colorRamps) 
  library(raster) 
  
  r &lt;- raster(nrows=5, ncols=5, vals=1:25)
  plot(r, col =  matlab.like(8))
  </code></pre>
  
  <p>This produces
  <img src="https://i.stack.imgur.com/tVANd.png" alt="enter image description here"></p>
  
  <p>As you can see, the legend has numbers from 5 to 25. These numbers are not so clear so I want to increase the size of them to be clear and make them bold. Thanks</p>