Modifying greyscale options in Acrobat

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Hello, I am wondering if there are any ways of changing settings in Acrobat to adjust how bright a PDF is when converted to greyscale. When I convert images to greyscale in Acrobat, they appear too dark. Is there a way to increase the gamma or exposure to make the PDF look brighter? 

The images are pictures of documents. I try to increase the exposure on them pre-PDF creation but after greyscaling them it appears very dark.

[try67 · Accepted solution]

Have a look at the Convert Colors tool in Acrobat. It has multiple profiles you can use, including several "Gray Gamma x.x" ones. If you can't find one that works for you then try the Preflight tool.