How are photosynthesis and cellular respiration opposite in terms of carbon dioxide

Photosynthesis is the process by which plants take in (use) Carbon-dioxide and water to make food (starch). 
                                  Photosynthesis: 

                                                
Cellular respiration is the process in which cells use oxygen to break down starch into energy molecules and give out Carbon-dioxide.
                                Cellular respiration:
 

So, in Photosynthesis, carbon-dioxide is taken in (used) and in cellular respiration, carbon-dioxide is thrown out (waste product)