I need to design a pdf document that can be both readable on a computer and on a paper printed using a "black & white" (i.e. greyscale) printer. Notably I want:
- to ensure that some text printed using some colors are still easy to read once printed
- to find a green and a red color that can be easy to distinguish, not only for color-blind people, but also once the color is printed on a greyscale printer (ideally the green color should look quite close to white, and the red should look more black)
However, I guess that there are many different ways to turn a RGB color into a grey color. Is there a universal conversion that is done by printers (for instance like taking the V component of HSV or similar)? Is there some tools that exists to tell me how easy to colors are to distinguish, for both color blind and for greyscale printers?