How to Select Images with the Magic Wand Tool in Photoshop CS6
The Magic Wand tool in Photoshop CS6 works best when you have high-contrast images or images that have a limited number of colors. For example, a blue and white umbrella is a perfect example of something that the Magic Wand tool effectively selects.
Just click the top of a blue portion of the stripe, and the Magic Wand tool picks up all the other surrounding blue pixels. You can now easily change the color of the blue squares to red or yellow in one fell swoop.
Some images are poor candidates for the Magic Wand tool. This image contains a ton of colors — and no definitive contrast between the glass, the wine, and the background.
Although it takes only one click to select the blue stripe on the umbrella, other high-contrast candidates may take a few clicks. And some images may need you to make a tweak or two to the Tolerance setting to achieve the modifications you are seeking to make in that picture.