RGB
Analog
film and Traditional VHS style video tape are analogue systems that record continuously varying colors an signals you have infinite changes when you zoom in you don't lose detail so you can enlarge the image and not lose detail.
Digital
digital film and digital video are digital signals the cameras have sensors that scan the image and take values of red green and blue and records the values of each signal
you get snapshots of the image that make up the image by splitting it up into pixels these values are recorded of a binary system when you zoom into a digital image you lose quality as the signal is not a varying signal and the video cannot work out what the colours would be between the pixels.
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