On the photos above we are going to Superimpose
the balloon onto the field image.
First rezise the balloon pic so that it is much smaller than the
field pic.
There are two ways of doing this, you can cut
freehand with the lasoo tool, or you can use the magic wand tool.
Here is an ideal opportunity to use the magic wand tool because
the background of the balloon pic is of the same color.
Selecting
the balloon
1. Using the freehand tool.
Select the freehand tool and on the tool options menu chose point
to point.
Now click on the balloon pic on where you want to start cutting
out the image. Move on a bit and click and so on until all the
baloon is selected.
In Photoshop hold the mouse over the freehand
tool to get more
options for that tool.
2. Using the magic wand tool.
First get the dropper tool and click somewhere on the sky behind
the balloon. This picks the right color. Then get the magic wand
tool and click the sky, to click more of the sky hold down the
shift key and click again. The amount of sky it selects on one
click depends on the tolerance. A tolerance of
30 is fine for this. Then with all the sky selected go to the
selections menu (or select in photoshop) and invert the selection,
to select the balloon and not the sky.
With the balloon selected.
Go to edit menu and copy (or CTRL & C on the keyboard) It
is then a good idea to pick the arrow or pointer tool. Then highlight
the field pic and paste the balloon into the image. You can select
the move tool to position the balloon where you want or select
the deformation to resize the balloon.

Superimposed image