We've added a new plugin, and it's one that's been requested by a lot of users.
Let's take a look at a screen shot.
The image is roughly 4x6 proportion and the user has selected and 8x10 print. The masks are applied to show them an approximation of what their image will look like after cropping.
You can either install the Show Crop plugin through the plugin browser or manually download and upload using your favorite FTP program. (We like FileZilla)
Once you've gotten Show Crop onto your server you will need to active it. Click on the Options -> Plug-Ins tab and the Activate link next to the Show Crop plugin.
Once activated, the Show Crop plugin will add two new options to the Options -> Images tab. Crop Opacity is a number between 0 and 100 that is the percentage opacity of the mask. Crop Color is the color of the mask and can be any string that works as a CSS color. Literal colors (black, white, etc), hex colors (#cccccc, #123123), or rgb codes all work.