Change color handwritten notes for printing

[Marnix5CDB]

I have some handwritten notes in white and greyish black. I would like to print these in pure black text and pure white background. The handwritten text can be selected (see below). 

Printing to pdf in greyscale with inverting colors leaves a grey tint.

The only way I got this to be actual white and black was through accesibility 'replace color' settings, which won't show up while printing. An example page is attached.

[Luke Jennings3]

One way would be to open your PDF in Photoshop and do 3 adjustments;

Image> Mode> Greyscale, 

Image> Adjustments> Invert, 

Image> Adjustments> Curves, (-15% in the lights, +5% in the darks), save as a PDF from Photoshop.

If you're doing this frequently, you could create a set of Photoshop actions.

Note, your sample PDF is not viewing correctly in Acrobat for me, but looks OK in Reader and Preview. I don't know what the issue is, but saving from Photoshop fixes this issue as well.

[Marnix5CDB]

While I appreciate the suggestion, I don't have acces to photoshop. I was hoping acrobat pro had an option to do this. It's kind of frustating that the accesibility option does exactly what I need and yet it doesn't print that way.

I might have to live with the grey hue left behind by this.

[external link removed by moderator]

[Luke Jennings3]

You might be able to adjust your scanner settings, as Gary suggests. Scanning as a bitmap (line art) will produce only white and black. Acrobat does have a preflight fixup that lets you adjust the midtones of a PDF, so you can make it lighter or darker, but you want to effectively adjust the contrast. There are many other image editors other than Photoshop, that can adjust the contrast of your scan, Macs come with the application "Photos" that can do it.

[gary_sc]

I do provide some guidelines for the scanning to help capture better scans that might be of assistance. 

http://photosbycoyne.com/Gary's_Help/Scanning/clean-scanning.html

Basically, you can either fix this before making the page a PDF (in the scanner) or after you've made the PDF (as Luke shows how in Photoshop) but you cannot fix this IN Acrobat.

[Marnix5CDB]

The problem is that these aren't made by me. My lecturer made these and insist that changing the colours is possible, so here's me trying to figure out a way.

[Marnix5CDB · Accepted solution]

The easiest way I eventually found was seperately saving each page as an image. Converting the image to pure black and white using the following site.

https://online-photo-converter.com/pure-black-and-white-photo

Combining these converted images to a pdf file. And inverting the pdf file using the following site.

https://invert-pdf.club/

[Strange05]

Thanks a lot, i also had the same problem. Although the "invert pdf" site is very very slow and gives result 1 out of 10 times, but its okay. Thanks a lot for your help.