Photoshop 8: Selection Tools - Different Ways to Select Part(s) of an Image
There are many ways to select your image or parts of your image. If you want to do specific editing where you select part of an image according to certain needs, there are several different selection tools to choose from: basic ones and the lasso tools. Here's a basic description of what each tool does.
Since selections are not often perfect on the first try, you can add or delete portions of an existing selection by just holding down on the shift (add) or control (delete) key and making another selection.
Here is an example of the Polygonal Lasso Tool
We started with this Arch Picture - #1. Using the Polygonal Lasso Tool we selected part of the arch as seen in picture #2. Then we copied the selection, opened a new image using a 'transparent background' and pasted the selected image as seen in picture #3.
# 1 #2
NOTE: A transparent background, allows for the background color of the web page to surround the image rather than a white box. If you choose transparent background, you have to save your final image as a GIF format.
Note: The following information is associated with an older version of Photoshop, but you might find it useful.