C++ coding that processes any arbitrary image?

[leah89]

I am completely lost on how to even approach this. I have to somehow produce a new satirical image in the same style as Fairey's poster (i.e. Obama's hope poster).

So basically, the code would have to be able to make any picture use the same colors as the barack obama's Hope poster (using colors red, navy blue, beige and a cream color) AND display the word "Hope" on it. I can't believe this is an entry level computer science class -__-

Here is a better visual. I have to make any picture use these same colors:
http://files.wizardstower.co.uk/wordpress/wp-content/uploads/2009/01/obama-hope.jpg


I also have to use a prototype that says the following:
void rectangle (int x, int y, int width, int height, double red, double green, double blue)

And I have to apply a posterize filter using four specific colors etc etc!

HELPP!!

[helios]

So which part are you having difficulties with?