Bit depth - confusion about it

Bit depth or color depth is kind of color image quality. It tells about possible palette of colors or number of colors I should say. Higher bit depth makes image more "colorful/deep" namely it can store more unique colors (rather more information about color) and tones ( so that's why I used quotes writing colorful ) For a grayscale image, the bit depth quantifies how many unique shades are available.

More technically image bitDepth- number of bits used to represent color/value of single arbitrary pixel in an image.

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