darkening a scanned pdf

[dzgnr89]

I have a pdf that is made of scanned pages and have text recognition [ocr has been done on them]. The pages are too bright and light, therefore a little hard to read. Whenever I need to print some pages of my pdf file I extract the jpg, darken it in Photoshop and then print it. Is there a way so that the pdf has all the images darkened and OCR preserved within Acrobat X so that I don’t have to darken pages individually one by one taking hours and get enhanced pdf in a short period of time? Im using windows 7 64 bit

[Allta Media]

Usually this type of correction is best done during the scanning process with your scanning software. There are only four filters in Acrobat when using in the Optimize Scanned PDF command in the Document Processing panel. Deskew, background removal, descreen, and text sharpening. You could try using the backround removal filter. This filter will increase the contrast between letters and background for clarity for gary and color input but not black and white. It will also make nearly white pages areas white.