Storing images in OpenCV
OpenCV stores images as a custom object called Mat. This object stores the information such as rows, columns, data, and so on that can be used to uniquely identify and recreate the image when required. Different images contain different amounts of data. For example, a colored image contains more data than a grayscale version of the same image. This is because a colored image is a 3-channel image when using the RGB model, and a grayscale image is a 1-channel image. The following figures show how 1-channel and multichannel (here, RGB) images are stored (these images are taken from docs.opencv.org).
A 1-channel representation of an image is shown as follows:
A grayscale (1-channel) image representation:
A more elaborate form ...
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