Page 218 - Web Applications (803) Class 11
P. 218

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
   213   214   215   216   217   218   219   220   221   222   223