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Selection Tools
With the use of selection tools, you may choose precisely the area
of the image you wish to work with. Everything you do after making
a selection only affects that region (the area that the selection
covers). This is crucial when creating shapes or choosing objects
from photographs. When you choose something, the selection is
performed in relation to the active layer.
There are seven selection tools as shown in the figure. Each has
unique characteristics, but they all share few properties:
Ð ÐMode: The selection’s creation method, including whether it
will be mixed with other choices, is determined by the mode.
Replace, Add, Subtract, and Intersection are different modes of
selection tools.
ÐReplace: It will cause existing selection is replaced by new selection.
ÐAdd: It will cause new selection to be added to existing selection.
ÐSubtract: It will remove the new selection from existing selection.
ÐIntersection: It will overlap the new selection with existing selection i.e. final selection
contains the area common to both the selections.
Ð ÐAntialiasing: It makes the selection’s boundaries more smoothly drawn.
Ð ÐFeather edges: This results in a fuzzy selection boundary.
Let us have a look at the various selection tools.
Icon Tool Description
Rectangle Makes a rectangle-shaped area selection. Making a rectangular selection is as easy as
Selection Tool clicking and dragging. When you let go of the mouse, the selection is made.
Ellipse Selection Selects an area with an elliptical shape (a circular shape). All you have to do is click
Tool and drag to make an elliptical selection. When you let go of the mouse, the selection
is made.
Free Selection Enables you to use your mouse pointer to freely draw a selection. When you let go of
Tool the mouse button, a straight line is drawn from the pointer’s present location to the
selection’s beginning point. You have the option to leave the image display’s edge and
then return.
Foreground Foreground select tool usage involves two steps. You first create a selection that includes
Select the entire object. You then use a brush to paint over the chosen region while remaining
inside the bounds of the object. When you’re finished, let go of the mouse button and
check your objects to see if they have any dark blue spots. If there are any, paint over
them once again with the brush before letting go to narrow the selection. Press Enter,
and your object will be picked once there are no more blue patches inside the object.
Fuzzy Select Tool Allows you to make a selection depending on adjacent areas of a similar colour
(Magic Wand) spectrum. The location at which you click and the Threshold value determine the
colour range (within the Tool Options dialog).
216 Touchpad Web Applications-XI

