ABSTRACT
Many of the mechanical and optical components of digital cameras may be similar to their analogue equivalents, especially in digital single-lens reflex cameras (SLRs). A few high-end digital SLRs and medium-format backs have this equivalent sensor size, whereas the majority of digital cameras rely on sensors that are smaller than the corresponding film format. The option to output unrendered image data has been a more recent development in digital cameras. The equivalent process in digital cameras is white balance, to estimate the white point of the light source and adjust the image accordingly. In drum scanners the original hard-copy material is mounted around a clear drum. A limitation of drum scanners is the requirement that the original is flexible and can be mounted around the scanner's cylinder. The original primary function of flatbed scanners was to scan reflective materials, but many currently available models also scan transparent materials.
