How do I convert a color jpg to a pure black and white jpg with no grey/shading?

how do I convert a color jpg to a pure black and white jpg with no grey/shading using Automator?

Hi mns579,
Thanks for your swift reply.
I'm afraid that sequence leads to a burn-out of some of the black text, making it unreadable.
To clarify, what I did was photograph pages from a book. The interior lighting of the room where I photographed these pages leads to a jpg image with slight graying or shading of parts of the page. So when I simply convert it to B/W, I get a washing out of some areas of the page where there is text, and this makes it unreadable.
I know that some software programs have a feature that allows a color jpg to be converted to b/w such that the text is made pure black and any surrounding areas of the text are made pure white (ie, all color is removed from the non-black areas), which makes for an easily readable b/w text page. Am I able to do this with my Mac, and if so, how using the Automator feature?
(I have more than 50 jpgs that I would like to clean up in this manner, hence the ability to do so through Automator is important.)
Thanks for your attention to this.

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How do I convert a color jpg to a pure black and white jpg with no grey/shading?

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