title: Crop an image in C#
body: <p>I am doing sort of a limited graphics editor in a desktop application in c# 3.5 GDI. the user first selects an image which is shown in a picturebox control which is smaller in size so image resizing is done to fit the picture. </p>
  
  <p>For cropping, the user selects the area to crop. there are a number of example on the net that explains how to crop the image but none of them explains the case when the area is selected on a thumbnail but the cropping is done on the original image i.e. some kind of mapping is done between the two images. </p>
  
  <p>all the graphic editor provide similar functionality. can you direct me to a link which explains how to do this?</p>