What is the Coloring? How can I use this feature in Galaxy Note8?

You can colors images provided by PENUP. Using the advanced S Pen and various colors, add your own colors to images. When you are finished, save the image to Gallery or post it to PENUP 
 

Open Air-command → Add Shortcut → Add Coloring → Tap Coloring → Select image → Start Coloring → SAVE

Pictorial representation of the above settings are as follows :  

 
1. Select Add shortcut.

2. Tap a Coloring icon and confirm Coloring icon is added on air command.

3. Open the Air command panel, tap Coloring.

4. Select an image.

5. Start coloring the image.

 
6. When you are finished, save the image to Gallery or post it to PENUP.  

CLICK HERE to know about PENUP and it's usage in Galaxy Note8 (SM-N950FD).