CMOS sensors are semiconductor light sensors like CCDs. They have much the same structure as the CMOS memory chips used in computers, but whereas memory chips use rows and rows of transistors to record data, CMOS sensors contain rows of photodiodes coupled with individual amplifiers to amplify the electric signal from the photodiodes. This structure not only enables CMOS sensors to run on less electrical power than CCDs, but also enables speedier and easier reading of electrical charges. This has, in turn, enabled Canon to develop full-size 35mm digital SLR cameras capable of the high-speed processing of very high-resolution images. Moreover, unlike CCDs, the manufacture of which involves complicated processes that make them costly, CMOS sensors can be manufactured by modifying the relatively low-cost processes used to turn out computer microprocessors and other chips.