Advance Digital Image Enhancement Method
Selections Techniques:
Reading
:
Chapter 2 "Selection Primer" - Studio Techniques
by Ben Wilmore
Lesson 1: Review Adding and Subtracting Selections:
Keystrokes are for Windows... For lesson with Macintosh keystrokes Click here
Objective: To learn how to add and subtract selections.
Reminder:
  [Shift+tool] adds to selection; [Alt+tool] subtracts from selection
[While selecting: Hold down "Spacebar" to move the selection… release it to resize the selection] [Ctrl+Z] will revert to last selection
[Double click] any tool to see "Alt" settings

1. Open "Selection.psd" file.
2. Make the "Background" layer active
3. Using the "Rectangle Marquee" tool:
 

- Form a "T" shape selection over the mushroom by "adding" two selection:

a) Select the top half
b) With the [Shift] key down, add the bottom 1/2 to the selection

{when done, press [Ctrl+D] to deselect the selection}
 

- Form a "T" shape selection over the mushroom by "subtracting" two selection:

a) Select the entire mushroom
b) With the [Alt] key down, subtract the bottom right of selection
c) With the [Alt] key down, subtract the bottom left of selection