Most camera sensors use a single layer of photosites (pixels). These are only sensitive to light, not colour, so a mosaic of red, green and blue filters (the ‘bayer pattern’) is placed on top of the sensor’s photosites so that individually they capture red, green or blue light. When the camera processes the sensor data […]
This the picture’s proportions as width versus height. DSLR sensors have a 3:2 ratio, so that photographs are 3 units wide to 2 units high. Most compact camera sensors have a slightly squarer 4:3 aspect ratio. It doesn’t matter what the units are – the ratio stays the same, so a photo could measure 3 […]
Another name for the ‘low pass’ filter fitted in front of most camera sensors. It’s designed to prevent digital artefacts such as moiré patterns and colour fringing caused by interaction between fine linear or rectangular patterns in real-world subjects and the camera’s rectangular grid of photosites.