title: How to increase the size of the graph while maintaining the relative scale of its elements
body: <p>I am required to produce publication graphs for a publication, however I have trouble scaling up the graphs while maintaining the relative size of its elements. </p>
  
  <p>The publisher requires</p>
  
  <pre><code>Submit the image as TIFF, at one of the following resolutions:
  Color: 300 dpi
  Grayscale: 600 dpi
  Line art: 1200 dpi
  Text-based graphics should be provided as 300 dpi, close-cropped TIFFs, sized to match print.
  To maximize the size of the figures on the PDF/reprint, figures should be submitted at the width of 2 columns (about 6.75 inches, 40 picas wide).
  </code></pre>
  
  <p>For example</p>
  
  <pre><code>tiff(filename="Test1.tiff",width=400,height=400)
  plot(c(2,2,4,4), c(2,4,2,4),xlim=c(0,5), ylim=c(0,10), xlab="Text xlab", ylab="Test ylab", pch=16, cex=1.5)
  polygon(c(2,2,4,4),c(2,4,4,2), col="darkblue")
  text(1,8,"Test")
  dev.off()
  
  tiff(filename="Test2.tiff",width=1200, height=1200)
  plot(c(2,2,4,4), c(2,4,2,4),xlim=c(0,5), ylim=c(0,10), xlab="Text xlab", ylab="Test ylab", pch=16, cex=1.5)
  polygon(c(2,2,4,4),c(2,4,4,2), col="darkblue")
  text(1,8,"Test")
  dev.off()
  </code></pre>
  
  <p>In this example Test 2 is larger (as graph area) however the axis and labels appear much much smaller. How can I correct this?</p>
  
  <p>Many thanks</p>