Page 236 - Webapplication11_C11_Flipbook
P. 236

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.
                     Replace: It will cause existing selection is replaced by new selection.
                     Add: It will cause new selection to be added to existing selection.

                     Subtract: It will remove the new selection from existing selection.
                     Intersection: 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 clicking
                           Selection Tool  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 and drag to
                           Tool            make an elliptical selection. When you let go of the mouse, the selection is made.

                           Free Select Tool   Enables you to use your mouse pointer to freely draw a selection. When you let go of the
                           (Lasso Tool)    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 the
                           Select Tool     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 spectrum. The
                           (Magic Wand)    location at which you click and the Threshold value determine the colour range (within the
                                           Tool Options dialog).

                           Select by Color   Enables you to pick areas of an image that have a similar spectrum of colours. This tool and
                           Tool            the Fuzzy Select tool are different in that the latter only selects continuous pixels, or those
                                           that are close to one another. On the other hand, the By Color Select tool selects every pixel
                                           that falls within the colour range, regardless of where it is on the image.
                           Intelligent     When attempting to select an area with prominent colour changes at the boundaries, this
                           Scissors Tool   tool can be helpful. To utilise the Intelligent Scissors, click the edges of the zone you want to
                                           pick in order to generate a collection of “control nodes,” also known as anchors or control
                                           points. Following any high-contrast edges it can locate, the tool creates a continuous curve
                                           that passes through these control nodes.
                                           Note that a good, smooth path is not always produced by this tool. Instead, the Path tool is
                                           more frequently used by knowledgeable GIMP users.

              Perform the following steps to use selection tools on images:
              Step 1:  Open the image on which you want to apply selection tool.
              Step 2:  In the GIMP toolbox, click on the selection tool icon. The selection tool can also be chosen by clicking the
                       desired Selection tools after choosing Tools from the program’s menu. To pick the desired area, the tool of
                       choice is dragged over the visible portion of the image.

                234     Touchpad Web Applications-XI
   231   232   233   234   235   236   237   238   239   240   241