The "layers" Metaphor is fundamental to many software applications, such as desktop publishing video animation and digital photography. The idea is that images are "laid" on top of each other, though the order is interchangeable. Think of layers as stack of acetate sheets with images; where the layer is transparent, you see through to the one below. However, not all software layers have the same resolution, start with the same number of channels, or have the same image mode. The final image depends on how layers blend or merge when they are "flattened", or combined for the final output. Before then, however, they allow to make changes without altering the original data, while each remains independent of the others.
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