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Use this program to change unwanted color outside actual image to transparent while removing excess edging from the image.
For those users of Greenfoot that do not have a graphics editor that handle transparency:
I have included an already created executable jar file that can be extracted from the download.
If you decide not to trust it, you can download, open in Greenfoot, check the codes and create a jar application yourself (make sure to restore all commented lines in the Pix class, first).
You may have to make some changes due to the version of greenfoot you are using (I use an older version).
This is a basic working scenario; but has restricted use on the site.
Outer transparent edges are automatically removed when the image is loaded.
Click on the color of the image you wish to make transparent; then click the 'Make transparent' button. All matching color pixels in the image will be turned transparent and all new excess edging will be removed from the image.
Loading and saving of image files can be done from and to anywhere in your file directory.