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More on extraction

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.

benjamin-morton
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More on extraction

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  1. More on extraction Using the magnetic edges feature

  2. Consider this picture • Suppose I want to extract the red circle

  3. The picture in PhotoPlus

  4. The picture in the extraction window

  5. Drawing the outline with brush size 4

  6. Drawing the outline with brush size 4 • It is quite hard to draw an accurate line when drawing freehand

  7. Drawing the outline with brush size 4 • It is quite hard to draw an accurate line when drawing freehand • One’s hand slips

  8. Drawing the outline with brush size 4 • It is quite hard to draw an accurate line when drawing freehand • One’s hand slips

  9. And one does not get an exact extraction

  10. Let’s try using brush size 40

  11. Let’s try using brush size 40

  12. Even if our hand wanders, …

  13. … our line covers the edge of the circle …

  14. … and we manage to get the exact circle

  15. But …

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

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

  18. Suppose we use brush size 40

  19. Our outline looks like this

  20. And the filled-in area looks like

  21. And we get this result

  22. Zooming in, we see how bad this

  23. Zooming in, we see how bad this

  24. Magnetic edges

  25. Magnetic edges • The extraction window provides an option called Magnetic Edges

  26. Magnetic edges • The extraction window provides an option called Magnetic Edges

  27. Magnetic edges • The extraction window provides an option called Magnetic Edges

  28. Let’s use it

  29. Using it on the circle picture

  30. Using it on the circle picture

  31. Using it on the circle picture • Even though our brush size is 40

  32. Using it on the circle picture • Even though our brush size is 40 • The outline is much thinner

  33. 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

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