Hi guys,
I have a solution for this! hope this will be useful to you
all.
1) Go to C:\Program Files\Adobe\Adobe Captivate
3\Gallery\Captions, and make a copy of the .bmp file, which is your
caption graphic
2) Go to a graphic editing tool like photoshop to open the
copied .bmp file. Select and delete all the color elements so it's
just a transparent layer.
3) Save it as .bmp in the same location.
4) Finally, when you insert a transparent caption, apply the
caption image that you just created and you will get a transparent
and crystal clear text!