The Clone Stamp tool (also called the Rubber Stamp tool) "clones" one area of an image, enabling you to paint it into another area. It can be useful for filling in an open area with a pattern or a color or for duplicating or repeating an object. The basic process for using the Clone Stamp tool requires you to set a source point (the point from which the pixel values come) in the image and then to paint that value into another area of the image.
Select the Clone Stamp Tool
Open the image file you want to modify and select the Clone Stamp tool from the toolbox.
Set the Opacity
In the Options bar for the Clone Stamp tool, click and drag the Opacity slider to set the transparency of the effect. For example, if you want to select a part of the image and apply it to another area on the image at the same intensity as the original, set the Opacity slider to 100. Set the slider to 50 if you want the copied area to appear more transparent (lighter) than the original area.
Set the Aligned Option
Enable the Aligned check box if you want the reference point to move when you move the brush. For example, if you place the reference point to the left and down 50 pixels from the current brush position, the reference point will always be to the left and down 50 pixels as you paint with the brush. Leave this option disabled if you want the reference point to sample the same area every time you click the brush (the size of the area depends on the brush size you select).
Select a Brush
Select a brush size and feather appropriate for the image. For the angel image example, you want to clone the entire face. A medium-sized brush with a slight feathered edge is your best choice for copying the face while blending it into the background. To set the feather, modify the Flow slider.
Set the Reference Point
Move the brush into the image window and position it at the desired reference point. Press and hold the Option key (Mac users) or the Alt key (Windows users) and click to set the reference point. The reference point is the starting point for the area you will clone.
Stamp the Image
With the reference point set, click and drag in a new location (away from the original area) in the image. Notice that a crosshair (the reference point) effectively paints a copy of the original area in the new location. If the Aligned check box was not enabled, the specific area you referenced in Step 5 is the starting point, regardless of where you click.
Sampling All Layers
Enable the Use All Layers check box on the Options bar for the Clone Stamp tool if you want the tool to sample all the layers as it paints. This is a good way to selectively consolidate material from multiple layers into one layer.
You can also paint a predefined pattern into an image with the Pattern Stamp tool, located in the Clone Stamp pop-out menu. With the Pattern Stamp tool selected, choose a pattern from the Pattern palette in the Options bar, select a brush size and other paint options, and paint the pattern into the image.