how to combine R,G,B values into a color value for setPixel

Hello again,

I had some trouble generating a proper color value for g.setPixel. My current experiments have led to some weird results:

• R,G,B parts have a range of 0...31
  
• the color value may be composed as follows R << 11 | G << 6 | B
  
  

But the shifts look strange - can they be correct?