I am interested what is the total area of a book page that is occupied by text. Basically, how much ink do I need to spend to print a page with text.
I have experimented with different fonts like
PT Sans and
PT Sans Extra Condensed:
Bodoni is a "modern" font, so it looks less dense than PT Serif and Helvetica. I have used some online tools to measure percentage of black color in the picture and it seems that Bodoni occupies 12% of the page, while PT Serif, PT Sans and Helvetica -- around 15%. PT Sans Extra Condensed -- around 22%.
If I switch to
black series, PT Serif Black occupies approximately 20%, Helvetica Black -- around 25%. PT Sans Extra Condensed -- 40% (barely readable).
Are there any guidelines on how "dense" and "black" should the text be for the most comfortable reading? Very dense texts (printed with a condensed of bold font) are hard to read, while if a text is very "light", it is also hard to read it.