Creating blocker using color

Hi friends, am new to scirra, in my game, am having a background with red and blue, if my object moves on red, object can move freely. if on blue, object should not move into blue areas(means blue should act as blocker and red as path way).. I know I can achieve it with an solid object but is this possible by identifying color and making object not to move on it ... please help me if so. Thanks in advance.

Well yes you can. However you would be needing to manually determine movement controls yourself. You can use on collision and then set your movement back a little so that you can't move on blue or a sensor sprite to just stop moving forward.

Unless your doing somekind of inversion of colour movement I see this as just complicating your work.

I cant get it clearly... jayderyu... no options available for this, so how to control it manually ..