There are three tools available that are most commonly used when manipulating photographs:
Color PickerYou can use this tool to pick up a color from the active layer and set it as the current primary or secondary color. For greater discussion of how to use this tool, please visit the Color Picker Tool section.
Clone StampThis tool is useful for copying regions of pixels between layers, or within the same layer. For greater discussion of how to use this tool, please visit the Clone Stamp Tool section.
Recolor ToolThis tool is useful for replacing one color with another. For greater discussion of how to use this tool, please visit the Recolor Tool section.