The processing was direct PDF-to-PDF file without extracting the images in the file, as originally requested. I then ran the file through XnConvert to apply that levels adjustment automatically to each page, and save the resulting output file as a PDF. But there are a number of practical considerations, starting with the fact that a little knowledge of image processing would be quite helpful, and including the fundamental issues that apply to creating multi-page PDF image files in terms of the output file size.įor my test I opened the downloaded colour file with the yellow tint in an image editor, and then applied a fairly aggressive levels adjustment to a typical page, to determine white and black points that effectively removed the yellow tint without causing too much collateral damage to the text.
Out of interest, I did a quick test using the above freeware program - which can be run on a Mac - and obtained a proof of concept result, although as stated above if searchability is needed the output file would have to be run through OCR software.
Xnconvert multipage how to#
And as there is no or minimal documentation other than the XnView forum, the easiest way to learn how to use the program is to explore the interface fully and to do some tests. Note that you will also need to install the freeware utility Ghostscript and to set a DPI value in XnConvert to obtain suitable image quality. Cday wrote:I think that it may be possible to do what you want directly using the cross-platform freeware software XnConvert, based on a quick test, although you would still need to OCR the resulting file if you need searchability.
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