Optimization
A no-optimization and two optimization modes are offered

1.NO OPTIMIZATION:
A single global rectangle is used for every frame. The global rectangle is defined in the 'define global rectangle' setting. This can obviously be used in all cases, but no optimization will be achieved. The animated gif filesize can be much larger than it needs to be. The only situation in which optimization is not possible is when every frame is completely different from the previous and fills the entire global rectangle area. Transparency =checked, will cause areas to become transparent. Dispose=checked will cause previous frames to be disposed. If dispose is off, then if transparency is also used, you will get a trail where previous frames remain and show through.

2.BOUNDARIES OPTIMIZATION: (normal setting: transp=checked, dispose=checked)
This should be used if you have a varying object moving over a clean background field. You will probably use transparency=checked so that the background field is transparent, and use dispose=checked so that you do not get a trail of the moving object. However, unlike regular Cloanto saveanimgif, you are able to choose transparency and dispose to be off (no checkmark). If transparency is off, you will get rectangles of various sizes, tightly surrounding your moving object. If dispose is off, you will get a trail (new frames will build on top of previous frames). There are many situations in which the use of a trail is powerful (for example, if you want to build up a picture from small pieces--the animated gif will consist of only those small pieces and filesize will be only a little larger than the full unanimated picture file

3.DELTAS OPTIMIZATION: Normal setting: transp=off, dispose=off)
This should be used when you have an object moving over a background that is NOT a clean field. It could be a constant picture-say a picture of a forest-with a bunny hopping through it. This mode will identify changes from frame to frame. The first frame will contain the whole picture of the forest, but the remaining frames will be rectangles only around the (bunny) areas that change (ie the delta) from frame to frame. In this case, you want the first frame (ie the forest background) to be preserved as changes are played over top of it. The default settings to use (as in saveanimgif) are transparency=off and dispose=off. W.A.D. allows you to create more complex animated gifs if you use transparency=checked. For example, you may want the forest picture to be irregular, and not a rectangle. If this is done, you should make sure you don't get transperent holes where you don't want it. Thus you should start by doing a LessColors operation that provides you with one palette color that is not in the original picture, that you can use wherever you want transparency.