In the old day the manipulation is not a easy thing and artist of manipulationist charge a lot of money for little change in the picture now in these day technology give us a great number of manipulating software which operating is so easy and we can do any thing we change the background we can change the hairs colors and also we remove bad things on the face. I should inculcated more tutorial which is best and easy to learn. Lets start to change hair colors.

Open the picture
Open the picture you wish to change the hair colour and you know very well that only hairs colors change whole face look. Opening mathod is either by clicking File > Open or by using keyboard shortcut Ctrl + O.

Picture by Tibchris

The picture we selected is that of a pretty model. We will change the hair colour to dark red.
Mask the hair
First we need to work on masking the hair, either click the icon or press Q to enter Quick Mask mode.

Press B to select the Brush tool. Adjust the brush properties to suit your image and paint over her hair.

Painting need not be precise; even if you go over the edges we will clear it in later stages.

Once you finish painting the hair, press Q again. This will make a selection excluding the area you painted. Either use Select > Inverse or use keyboard shortcut Shift + Ctrl + I to inverse the selection. Now the area you painted over is the selected.

Create a New Layer
Create a new layer above the current layer. Either click on the icon or use keyboard shortcut Shift + Ctrl + N to create the layer. Rename the new layer Hair. With Hair as the active layer; fill the selection with the colour you wish to use for the hair, in this case we used dark brown. You can either do Edit > Fill or press G to use paint bucket to fill.

Blending the Colour
In the layers palette right click on the Hair layer, in blending options select the blend mode to soft light.

Erase the spill over’s
Click icon or press E to select the eraser tool, adjust the opacity, size and hardness of the eraser as per your preference and erase the colour cast from the areas you may have overlapped like forehead, ears etc.

Darkening the Shade
If you would wish to darken the hair colour a bit more; duplicate the Hair layer; either by right clicking on layer 1 and selecting duplicate layer in the layers palette or by using the keyboard shortcut Ctrl + J. Now you have an even darker shade for the hair. Right click the new layer and in blending options and choose colour burn. Adjust the opacity as per your taste. If you feel you have over done certain portions of the hair, select the eraser tool and set it to a low opacity and erase as much as necessary to give it a natural feel.

You may even switch between the two layers while working with the eraser tool to give the appearance of highlights and shadows.

Conclusion: Congratulations, you have now successfully changed the colour of your models hair. Now you can try your own and other friends pictures and give a sweet shock.