SaveAS() not generating better quality images

Hi
I created jpegs of a pdf, however the quality is bad.
Is there a way to improve the quality?
jsObj.saveAs("FILENAME.PDF" & ".jpg", "com.adobe.acrobat.jpeg")

how do i get to that, thru the menu?
which mensu commands?
also is there a way to directly write code to make this setting so it will be done automaticlly thru code than have to change it manually?
thanks

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