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This 17-minute video takes a geeky deep-dive into film camera communication and automation

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One of my favourite channels to watch on YouTube is Technology Connections. In each video, our host takes us on a journey through the histories of different technologies, explaining where they came from and how they work. It covers all kinds of technologies, but occasionally, the topic becomes somewhat related to photography or video. We’ve featured the channel here on DIYP before, to explain why cameras and our eyes see in RGB.

Now, he’s back to explain film. But it’s not a complete overview of how film is made, how it captures an image, how you can develop it or turn it into a print. Oh no, this super geeky video goes in-depth into one very specific aspect of 35mm film and that’s DX encoding – Or Digital IndeX). What is it? Why does it even exist? What does it do? And does it really matter?

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This brain-melting video explains why our cameras see in RGB – just like our eyes

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When we’re kids, in school, we’re taught that the primary colours are red, yellow and blue. But this isn’t entirely accurate when it comes to light. Pure white sunlight is made up of a whole spectrum of colours, with the primaries actually being red, green and blue. Our cameras with Bayer filter arrays on the sensor see RGB. Our monitors also display RGB.

But have you ever wondered how we’re able to get so many different colours from just three? And why just blasting red, green and blue LEDs at an object doesn’t always give you true white light? This fascinating video from Technology Connections isn’t really specific to photography, but light in general, and how red, green and blue affects our (and our camera’s) perception of colour.

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