In the "Formats" section add the "Keep original format option"
Assume I have 100 pictures (in several formats) and I only want to rotate them (or rename, resize etc.) I am also forced to change their formats to one of the below listed formats:
To Jpeg
To Bmp
To Png
To Pdf
To Tga
To Tiff
To Gif
ToPsd
To Pcx
To Ico