To color in Procreate without going over the line follow these steps:
- Select the layer that hold the object to be colored.
- Make sure that the object you are using is enclosed, otherwise the color would spill all over the canvas.
- Set the Selection tool to automatic.
- Pick the color from the color palette or if you want to pick and drop the color from a specifi area you could choose the eyedropper tool.
- Then finally tap within the object. And you are good to go.