I know how to change the size of the canvas in the Snagit editor itself. But when using the Windows version, I could copy and paste the canvas into Outlook (or other email program) and THEN still change the size by grabbing a corner. The aspect ratio was also maintained. This helped reduce the size of the image to the viewers and also helped in formatting if I had written text above or below the pasted canvas. On my Mac, however, once I copy and paste the Snagit into Outlook, there is no way for me to change the size of the pasted canvas. It pastes VERY large and I want to be able to reduce it while maintaining the aspect ratio.