more on extraction
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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