Remove Background Color from Scan

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hello.  i'm scanning acrobat 9 pro, , paper being scanned light-green in color.  scanning students' homework pages on pre-printed worksheets, there printing on light-green paper, students' hand-written answers.  scanning b&w or greyscale doesn't work because pencil doesn't have enough contrast background show up. 

 

==> easiest way remove background color , change images greyscale or @ least white background <==

 

i've tried optmize pdf / background removal, no luck that.

 

my current workflow use touch-up object tool, select each portion of scan (there 3 image objects per page), choose "edit image" (which brings photoshop), perform sequence of steps in photoshop select color of background, delete it, desaturate image, , return acrobat.  fortunately, able automate steps photoshop action.  still, having click on 3 objects on every page real hassle.

 

is there better way remove background scan when comes colored piece of paper?

 

prefilght seems promising, have no experience that.

 

any advice helpful.

 

thanks!

 

-- curt.



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