The time may come when you want to share your images with the internet. Fortunately, Acorn comes with a Web Export panel that will help you choose which image format to use, along with an easy way to compare formats. You can bring up Acorn's Web Export panel via the File ▸ Web Export menu.
To toggle between a preview of your exported image and the original, click on either the "Preview" or "Original" labels in the top left of the window. You can also click on the image to toggle back and forth.
Choosing a format to export your image is as easy as selecting from the list of formats on the left. Some options, such as JPEG and JPEG 2000, will allow you to set how much compression to use via the Quality slider. The higher the quality setting, the bigger the file size. Adjust the quality slider to find the best setting for you. The file size of the current preview is available in the bottom window bar.
If your image has transparent edges that you'd like to minimize, click on the Trim option. This will allow your image to be as small as possible.
If your image has transparent pixels, and you would rather not have them changed to white when exporting as JPEG, you can alter the matte color with the Matte option.
The script icon in the bottom left of the window contains the same entries found in the File Actions menu. Choosing one of these will send your web optimized image to the selected application in the list.