Create a selected area using Magic Wand
Activate Magic Wand. Click on any pixel. The adjacent pixels of the same tint, or of the same level of transparency, will be selected. Then nonadjacent pixels of similar color can be added to the selected area.
Turn on the flag "All Layers" on the Tools Panel, so that pixels from all areas shown on your monitor can be taken into the selected area. Turn off the flag "All Layers" on the Tools Panel if you wish to take pixels only from the active layer.
Turn on the flag Antialiasing to make the border of the selected area smoother.
To change the range of colors available for the Magic Wand, insert a number from 0 to 255 into the field "Tolerance" on the Tools Panel, and then click again on the image. Insert 0 to select only one color. To gradually increase or reduce the range of colors, change the delay between mouse clicks. The higher this value, the bigger the range of colors that are available for selection.