The last piece of the puzzle which completes the picture…get it…picture? Anyway it is the ISP or Image Signal Processor. Bad ones make everything look hazy or cloudy when the sun shines on them. Good sunglasses are ones that make your eyes see clearly even when you are facing the direction of the sun. Think of the CMOS sensor as your eye and the bayer filter as some sunglasses. The filter needs to be able to map colors as accurately as possible and also allow as much light as possible through it for the CMOS sensor to get the clearest and most detailed image of whatever it’s looking at. This filter and the CMOS sensor need to be carefully made so that they work together to recreate the best possible image. The same way you get them snapchat and insta filters. This then maps the greyscale pic to the RGB filter and you have some colour. Basically what it means is that the sensor sees things in thousands or even millions of shades of grey and not just the 50 that you see in movies.įor the picture to be turned into colour, there is a colour filter put on top of the sensor called a Bayer filter. And in its pure form it can only see images in greyscale. The camera sensor is also referred to as a CMOS sensor. But this is just the surface of it so we are going to go even deeper into how the sensor works. Each pixel is split into 3 with each pixel creating a colour on that part of the image by mixing different amounts of red, blue and green.
Lighter and darker shades of any of these 3 primary colours will make any shade of any colour. Later on I understood that red, green and blue are called primary colours because they are the colours that are used as building blocks for every other colour. How does a pixel work? How do pixels produce the exact colour at that part of the image? I remember in primary school we were taught that the primary colours are Red, Green and Blue. Now that we all know what a pixel is and what megapixel means let’s go a bit deeper. In maths it’s the area that the image covers. Mega is a word describing one million and so 1 megapixel is one million of these boxes on one page. This is where the word Megapixels comes from. And we can colour each box differently until a collection of all these boxes makes up an image. So each box on this page is equivalent to a pixel. Don’t worry we won’t be doing any math right now. Think of an image as a page within a maths exercise book. So just a disclaimer, I’ll be going into the weeds a bit on the technical bits behind what makes a good camera but I promise I’ll try my best to explain it as simply and clearly as possible.
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