A common principle in Photoshop "select the object" to "edit the object".
The tools can be divided into 2 categories manual and automatic.
It is necessary for the learner to identity which technique should be used.
They can be added to, subtracted from and intersection made on them.
Once the selection has been made if can then be modified using the refine edge command.
1 - lasso tool One of the first selection tools and the most difficult to achieve a detailed result.
The lasso tool has specific use and this is generally to add or subtract from existing selections.
The selection is made by drawing over the required area with the lasso tool selected.
When the mouse is released the selection is made.
2- polygonal Lasso Tool One of the original tools this is the most common manual technique.
Selections are made by clicking and dragging with the tool active.
The user will select the required shape by working around the object.
To delete unwanted points the user will press the back space key.
The selection is completed by either pressing the enter key, double clicking or clicking once when you hover the last point over the first point, a small circle will appear then click once to complete.
3 - Magnetic Lasso Tool This feature a combination between the manual and automatic section tool.
The user can either work around the object similar to the Polygonal Lasso Tool or let the Magnetic lasso detect the edge of the image automatically.
The selection range is defined by the frequency.
The greater the frequency the greater the range of colour Photoshop will select.
Unwanted elements can be removed by pressing the back space key.
4 - Magic Wand Tool This is an automatic selection tool.
When used in the right circumstances it can be extremely powerful and effective.
The user will make an initial choice.
They can modify the selection as you would any other selection using add, subtract or intersect.
The range of colours selected is based on tolerance.
The great the tolerance the greater the range of colours it will choose.
The maximum tolerance will be 255.
To achieved optimum results the user should photograph the object against a solid background.
Green is the preferred colour, then inverse the selection to select the required area.
5 - Quick Selection Tool This is an automatic colour selection tool where Photoshop will select colour based on spacing.
The lower the spacing the greater the range of colours will be selected, the maximum spacing is 100%.
To apply the effect the user will effectively paint the selection onto the object using a quick selection brush.
The user must ensure at no time do they exceed the edge of the required area.
If so the required area will be over-selected.
The active area can be modified by using the adding and deleting function of the quick selection brush.
Selections are an important element in Adobe Photoshop.
The most effective method of selection making is to use the quick selection tool and to modify the result using a suitable lasso.
The primary emphasis is to make a detailed but quick selection.