Key to this technique is the use of Opacity and Layer Blend Modes to merge the color data with the drawing.

Layer Blend Modes:

Offers precise control of the blending of a pixel with the composite pixel below (every pixel in a straight line beneath it.) Controls offer the power of a mask, a filter, and a color map combined in a temporary (undoable) solution. Results are logical but unpredictable. Experimentation is highly recommended.

 

 

 

 

 

 

 

 

 
Mouse over the croc to see the final rendering. Note how much of the pencil work is actually visible in the final.
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