Chapter 4 - Making & Manipulating Selections.

Marquee tools -

There is 4 marquee tool in the Adobe Photoshop which is:
1 - Rectangular Marquee tool for make a rectangle selections.
2 - Elliptical Marquee tool for make a circle selections.
3 - Single Row Marquee tool for make only one row of selection. (-----row------)
4 - Single Column Marquee tool for make a one column selection

            |

            |  

            | (column)

Lasso tools - 

There is 3 lasso tool in Adobe Photoshop which is; 

1- Lasso tool - free hand selection but must connect the point to the point.

2 - Polygonal lasso tool - a polygon selection tool must have more than two surface in order to                connect the point (for example triangle have 3 surface , hexagon 6 surfaces.)  

3 - Magnetic lasso tool - tracks the edges of an object by clicking the object edges.

Transforming Selections -

1. Scale - change size of selection
2. Rotate - Spin selection
3. Skew/Distort - stretch and pull selection
4. Perspective - simulates object meet at horizontal line
5. Flipping - turn selection horizontal to vertical axis.

Return/Enter key to commit selections
Esc to remove transformation.

Saving and load with Alpha Channels
save a image so you can load back the same image in other tabs.

How??
Select > save selection
save as alpha channels

Also contain specific image data;
black and white - one colour channel
RGB - 4 colour channel
CYMK - 5 colour channel.