This can be done in Crazytalk 6 Pro (not Standard) by using the SFX Swap track of the Timeline. You will need to first create a background mask for your characters(s) as described
HERE.
For example:
Double click on the SFX Swap track of the Timeline at the desired frame.
The Special Effects panel will open.
Select an effect such as Image Overlay - Full Screen (from dropdown) - A_Full
Then switch to Modify and select Image Import. Choose your desired background.
On the SFX Swap track drag the newly added background effect to the desired length.
Now repeat the above to add further backgrounds along the timeline at the required frames.
You can find out in detail how to use the SFX tracks in the Help Guide HERE.
Peter
Forum Administrator
www.reallusion.com