More on extraction

Using the magnetic edges feature

Consider this picture

• Suppose I want to extract the red circle

The picture in PhotoPlus

The picture in the extraction window

Drawing the outline with brush size 4

Drawing the outline with brush size 4

• It is quite hard to draw an accurate line when drawing freehand

Drawing the outline with brush size 4

• It is quite hard to draw an accurate line when drawing freehand

• One’s hand slips

Drawing the outline with brush size 4

• It is quite hard to draw an accurate line when drawing freehand

• One’s hand slips

And one does not get an exact extraction

Let’s try using brush size 40

Let’s try using brush size 40

Even if our hand wanders, …

… our line covers the edge of the circle …

… and we manage to get the exact circle

But …

But …

• Suppose we want to extract the girl on the right-hand side of this picture

But …

• Suppose we want to extract the girl on the right-hand side of this picture

Suppose we use brush size 40

Our outline looks like this

And the filled-in area looks like

And we get this result

Zooming in, we see how bad this

Zooming in, we see how bad this

Magnetic edges

Magnetic edges

• The extraction window provides an option called Magnetic Edges

Magnetic edges

• The extraction window provides an option called Magnetic Edges

Magnetic edges

• The extraction window provides an option called Magnetic Edges

• Let’s use it

Using it on the circle picture

Using it on the circle picture

Using it on the circle picture

• Even though our brush size is 40

Using it on the circle picture

• Even though our brush size is 40

• The outline is much thinner

Using it on the circle picture

• Even though our brush size is 40

• The outline is much thinner

• Because the software tries to attach the line to the edge that our brush covers as it moves along