Change brightness or contrast

I have some pdf files to show which are too white, I'd like to know if its possible to adjust the brightness or contrast of these pdf files for showing with WPDF.

Thanks!

Zitat von wpsupport

Hi,

I assume you mean WPViewPDF but -no, there are no such options.

Julian

Yeah thats what I mean.. I saw a software made with dot net which have such options, but I cant seen to find which component was used :(