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imgs -> arrays that support variety of data types (dtypes)

Data type	Range
uint8	0 to 255
uint16	0 to 65535
uint32	0 to 232
float	-1 to 1 or 0 to 1
int8	-128 to 127
int16	-32768 to 32767
int32	-231 to 231 - 1

OpenCV uses BGR for color images and its dtype is uint 8 by default.
Converting BGR to RGB or vice versa

OpenCV has three dimensions: width, height and color. 
>>> image = image[:, :, ::-1]