Setting Transition is to set transition for the images in your ScreenSaver.
There are some options in the window that you can select.
Don't clear the image There are two options below you can set if this option is not checked..
Select Transition In
The transition is set to show the image;
Select Transition Out The transition is set to clear the image;
If it is checked, there is only one option.
Select Transition
The transition is set to show the image since the image is not to be cleared; If your are not to make a ScreenSaver with your images flying in screen, the image will remain in your screen until it is covered by another one.
Random transition at run time
Check this option to let your ScreenSaver select a transition randomly at run time. You can select a special one in the samples group if it is unchecked. You can also double click a sample to select it and this option will be unchecked automatically.
Speed
This is to adjust the speed. Moving the bar to the right makes the transition faster but less smooth.
Delay
This changes the delay time between two frames of the transition. Moving the bar to the right makes the transition delays longer thus it is much slower.
Apply to all
This option is to apply the settings to all the images in your ScreenSaver. It is invisible when setting transition in the New Wizard since the transition is to be set as a default one for new images.