need a small software can adjust brightness constrast of pdf - repost

I need a small software can adjust brightness-contrast of a multi-page pdf file. It makes the pdf file become more "clear" and it must work directly on pdf without extracting to image. please show me some software can do that. I will check and pay maximum 7$ for this ( please don't tell: imagemagik, photoshop, or other "big" software). thanks!

Compétences : OCR, PDF

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Concernant l'employeur :
( 8 commentaires ) HCM, Vietnam

Nº du projet : #4639593