What is a layer ?

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Images are usually considered to be two dimensional. That is, when images get printed on a piece of paper or displayed on a screen, they have a height and width only. Although there may be an appearence of depth, there is no actual depth. The images are flat, and they lack that thrd dimension.


Whenever you view images fresh from a digital camera, the images is flat and dimensional on your screen. This is true, even though the color image is actually stored as seperate red, green, and blue (RGB) grayscale components in the file.

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