If you are going to create complex selections this way then really you are often better off using the quick selection tool or choose the Select Color Range option, which can also be used to create selections based on color values. However, you can use the smoothing options in the Select menu to tidy up a magic wand selection. I find the magic wand tool works OK on low resolution images but that is about the limit of its usefulness. That’s what most people expect the magic wand tool to do but in reality it does not always perform that reliable a job. For example, if you have a picture of a landscape with a blue sky and click in the sky area with the magic wand tool, it should just select the sky. The magic wand tool can be used to select pixels on the basis of their luminosity values within the individual color channels that make up the composite image.
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