Well, firstly it's an intricate process to do the hair selection, because it depends upon the situation of the image source which technique should be applied, and which shouldn't. However I will give you the outline and a hint to achieve this type of selection.
First condition, if the image has fairly uniform or highly contrasting background like green or white which doesn't match with the subject image and you can go with the Color Range tool to select that particular color, where as it if has all different kinds of background in it, then here are the processes
1st go to Image>Calculations
2nd attempt to silhouette the image as much as you can, and play with different channels. Especially the combination of green and blue work best, most of the time. Applying the blending mode to either Add or Subtract you will get the maximum amount of flexibility. After you are happy with the result, make sure that Result is set to the New channel, and click on OK.
Note: try to make the subject white as much as possible and the background black.
3rd After the applying the calculation command, attempt to silhouette the image completely in the Alpha 1 channel i.e. color the subject with white and the background with black.
4th Ctrl+click on the thumbnail on the alpha 1 channel and then go to the layers palettes and change the image from background to layer, then click on the add layer mask icon
Well here were the hints, rest is all up to you..
However I will be happy to help with the selection, if you have that work for me.
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