Here's really quickly made script for it... it may be ugly, but at least you get started

This converts pic0001.jpg to newpic0001.jpg etc in defined directory (path).
Save following text to file (don't forget the first commentline) and run it with rx when Photogenics is running:
/* photogenics test */
options results
/* ======config====== */
path="ram:"
verbose=1
jpegquality=80
/* ===end of config== */
address PHOTOGENICS.1
DO i=1 TO 9999
num=RIGHT(i,4,'0')
IF EXISTS(path'pic'num'.jpg') THEN DO
LOADHIDE path"pic"num".jpg"
image=result
/* put the wanted effect here */
PAINTMODE image "Brightness"
MODEOPTS image 150
FILLIMAGE image
FIX image
/* end of effect */
SAVE image "JPEG" path'newpic'num'.jpg' jpegquality
CLOSE image
END
ELSE EXIT
IF verbose=1 THEN say 'Image 'path'pic'num'.jpg done.'
END
EXIT