halloz,
just take a look on TANZANIA flag,and i want to write a word AMERICA,so it must have those four colors of the flag,is it possible?

Assuming that I understand what you are wanting....

I think what you want to achieve can be done using the masking technique in Photoshop. Here is a good tutorial on masking if you want to learn how.


http://www.webreference.com/graphics/column23/