After installing you should be able to open "Example RLE.rsrc" with ResEdit.
It will show the RLE# resources with icons and a preview picker.
Opening a resource will create a window of the correct size.
Copy and paste should then be enabled, to export and import pictures.
Adding frames
At the bottom you have a scrollbar to change frames, as well as indicator of current frame.
Use menu item "Add Frame +" to get more frames,
and "Delete Frame -" to remove the current one.
Pasting uses the current screen depth to determine which depth to make the new RLE in.
Transparent color
The currently set background color is used when copying or pasting (for transparency).
You can set background color either with the normal system color picker,
or by choosing a pixel from the current image with the eyedropper tool.
New Versions
New versions of this editor may be provided more frequently than new versions of SpriteWorld are made available. The latest version will always be available here: