To generate
a JPEG (.jpg, *.jpeg) file, it is necessary to set the output format properly.
For that open
the "Profile Settings" dialog window (or make use of the "Properties"
window). In the Main section select "JPEG, Joint Photographic Experts
Group" from the "Output
Format" list:
Image encoding parameters.
Quality - the quality
of the produced image. This parameter can take values from 0 (minimum
quality) to 100 (maximum quality).