Super noob about optics, so forgive me if I make any mistakes. But I have   
   images from smartphones which have a color checker in them. I wish to   
   calculate the opto electronic function(can i use color checker for this?) so   
   that I can map my processed RGB    
   values onto linear scale ( rgb values before smartphone camera applies   
   processing).   
      
   any advice/answer to clear what this is would tremendously help me out. thanks!   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)