The reproduction quality of the image depends on the quality of the lens and on various characteristics of the digital camera. In general, photos show the finest and smallest image details with corresponding gradations and color differences. As in the case of viewing by a human being, the viewing angle of the photos can be changed by the focal length of the camera. This changes the scale of the image and the representation becomes wide or narrow-angled. To improve the photo quality of digital cameras and smartphones, there is computational photography, which starts at the camera lens and uses various image processing algorithms to contribute to higher photo quality.
In digital cameras, photos are displayed in a large number of pixels. The number far exceeds the resolution of the human eye. This may well be 10 million pixels and more, located on an image sensor the size of 2/3". Only with extremely high magnification can the pixels be resolved.
The high pixel count, in combination with the color depth, leads to extremely large image files. For example, a photo with a resolution of 10 megapixels( MP) at a color depth of 24 bits in RAW format has a file size of 30 megabytes( MB). Photos in this file size limit the storage capacity and also have the disadvantage of being cumbersome to handle and communicate. For this reason, RAW photo files are already compressed in digital cameras into JPEG, the optimal image compression for photo files, because it reproduces color gradients and the brilliance of the photos well.