It has been known for a couple of years now that increasing the number of pixels in digital cameras does not lead to better images. The best compromise for a compact camera is a sensor with 6 million pixels or better a sensor with a pixel size of >3µm.

Camera lenses sometimes show an image error, which becomes more and more prominent at higher resolutions: chromatic aberration. It concerns a slightly different image scale for the individual light wavelengths (colors).

The file size of JPG images depends on the number of pixels as well as the selected image quality setting.

If you stop down the aperture more and more, the resolution in the image starts decreasing at some point. The reason is the so-called diffraction that limits the resolution.

The term noise is related to artefacts in digital images caused by the capture and transfer of the signal. It appears as colored or bright spots in the image.

Unlike its typical usage, the resolution of a digital camera doesn’t indicate its pixel count; it rather defines the ability of the camera to reproduce fine details.

The sensitivity describes how a recording medium reacts to light. The fact that sensors are kept small, but get sectioned into more and therefore smaller pixels, leads to problems with sensitivity.