This is what I mean by yellow color:
The lamp bulb I look doesn't look very yellow. Let's assume that I cannot change the lamp color. The lamp must be the origin of the yellowness though.
I use a windows 10 laptop
I use a galaxy s6 to take the pictures
I have a bunch of pictures from a book on my computer that are yellow tinted
What are the best free software to make the yellowness turn white for a group of many (say 100) images? And still after the image editing have crisp/clear pictures on book pages with mainly text and some math/diagrams?