Primary Lasso Tool
The
primary lasso tool is used by clicking and dragging around the required area.
Selection is completed when you return to your starting point. To cancel press
escape.
Pros:
- Allows for the utmost precision especially when used on a high
definition monitor, and with a high DPI mouse
Cons:
- A small movement can undo a lot of time and effort forcing you to
start again.
Polygonal Lasso Tool
The
polygonal lasso tool is used by clicking on the edge of your intended selection
then clicking along various points. A straight line will be drawn between the
two points, if an error is made pressing backspace will revert to the previous
point.
Pros:
- Very quick and easy to use
- Easy to correct a mistake
Cons:
- Not useful for round selection
Magnetic Lasso Tool
To
use the magnetic lasso tool click on the edge of your image and move your
cursor around the area you wish to select. The line will attempt to stick to
the edge of the image placing markers at various intervals, these indicate the
edge of your selection. This tool works best when there is a strong contrast
between the edge and the background, whilst moving the mouse slowly and
accurately. If a check point isn't made when you want one, click and one will
be placed. If a marker is placed in error, press backspace until you are back
to the checkpoint you wish to resume from. To finish selecting, move your mouse
to the starting checkpoint, ensure there is a circle beneath the lasso icon and
click.
Pros:
- Easy to use
- Accurate
- Easy to undo selection errors
Cons:
- May have trouble defining an edge where there is low contrast.
If
you have finished editing and wish to add a layer to the original image,
confirm that your two layers are beneath one an another *screen* Right click
the upper of the two layers and click merge below (If this option is greyed out
ensure that both layers are unlocked)
Please view my accompanying video guide
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