Wide used method for making selections of large areas is to select part of the background that contains most of
the colors that appear within that background or the layer where you are active. Then you can go under the Select
menu and choose Similar as seen on the image. Photoshop will then select all the similar colors in your image. Very
cool and fast. Do you know how many pixels out the Similar command selects? Note number in the eliptical
markings of the attached image. The higher the setting, the more pixels it selects. When you use Similar, and it
doesn't select enough colors, take again Magic Wand tool, shortcut is W, increase the Tolerance setting, and then
try running Similar again.