madhuras,

It would help a lot if you could provide an example image. In MEP you can do 'File' >> 'Export movie' >> 'Single frame as JPEG'. There are limits as to what can be done with chroma key particularly if what you want save has similar colors to the background or has a lot of fine detail shapes.

Also please note my previous suggestion -- continue a thread by clicking on the 'Answer' button under your original question to add to the discussion, rather than start an appently new topic. See: http://www.magix.info/us/chroma-key.knowledge.1111369.html for my comment WRT your thank you notes.

Regards,

Carl