This tool is used to copy regions of pixels from one location to another. The source and destination can be on the same layer or different layers within the same image.
To use the Clone Stamp, first set the source point where the pixels will be copied from.
Do this by clicking an area of the image while holding down the Ctrl key.
Set the source point by holding down the Ctrl key and clicking on the source image.
Repeating Ctrl + Click sequence resets the source to the newly clicked location.
Navigate to the destination location (where you want the pixels to be copied to). The source location will remain where it was set. Click and drag to copy from the source to the destination.
Note that the source point moves in the same path as the tool when cloning starts. This results in the tool path being copied as a stripe rather than just the source point.
The relationship between the source and destination is fixed once the actual cloning is started.
Once the relationship is set, the points remain locked together.
This relationship will persist through tool changes and other editing operations.
To break the link, set a new source point by holding down the Ctrl key and clicking at a different location.
Tool Bar Options
Clone Stamp inherits the Brush Width, Hardness and Antialiasing settings from the Tool Bar.
Reducing the Hardness setting has the effect of softening the edge of the stamp.
In this respect, Hardness can be considered the strength of the antialiasing used to soften edges.
Because of the relationship between Hardness and Antialiasing the Hardness setting is ignored if Antialiasing is disabled.
A low Hardness value can be used to make stamped regions less obvious.
A Blend Mode can also be applied, much like a layer blend only specific to the tool path. See Blend Modes for more information.
In the picture below, the orange has been cloned to appear as part of the apple.
Example - Clone Stamp Tool
While cloning, circles are drawn to indicate the location of the source and destination.
Adjusting the Opacity of the Stamp
Clone Stamp inherits the opacity of the Primary color if the Left mouse button is used to perform the cloning action.
Using the Right mouse button makes the Clone Stamp inherit the opacity of the Secondary color.
If the opacity is lowered the stamp will copy a partially transparent copy of the source.
In the following image the opacity of the Primary color has been reduced to 100.
The result of cloning using this setting sees the copied pixels having reduced opacity compared to the source.