Channel (digital image)

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Color digital images are made of pixels, and pixels are made of combinations of primary colors represented by a series of code. A channel in this context is the grayscale image of the same size as a color image,^{[citation needed]} made of just one of these primary colors. For instance, an image from a standard digital camera will have a red, green and blue channel. A grayscale image has just one channel.

In geographic information systems, channels are often referred to as raster bands.^[1] Another closely related concept is feature maps, which are used in convolutional neural networks.