Color is not, contrary to popular belief, a guarantee
that a document will be appealing. In fact, some documents look better
without color. As a general rule, color should be used on no more than
one-third of a page – and almost never for text.
Color works best as a separator. Using color for thick lines and small
artistic elements works well, without over-powering readers. Learning
to balance the use of color comes with experience.
Even if you plan to send a document to a full-color commercial printer,
there is no need for every photograph to be in color. If you have ever
looked at an Ansel Adams or Scott Mutter photo, then you understand that
black and white can have a strong impact on viewers. Photographs that
highlight textures and patterns are often more effective in black and
white.
Give a lot more detail….