darkening a scanned pdf

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i have pdf made of scanned pages , have text recognition [ocr has been done on them]. pages bright , light, therefore little hard read. whenever need print pages of pdf file extract jpg, darken in photoshop , print it. there way pdf has images darkened , ocr preserved within acrobat x don’t have darken pages individually 1 one taking hours , enhanced pdf in short period of time? im using windows 7 64 bit

usually type of correction best done during scanning process scanning software. there 4 filters in acrobat when using in optimize scanned pdf command in document processing panel. deskew, background removal, descreen, , text sharpening. try using backround removal filter. filter increase contrast between letters , background clarity gary , color input not black , white. make white pages areas white.



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