HOW SCANNERS WORK
Scanners operate by shining light at the object or document being digitized and directing the reflected light (usually through a series of mirrors and lenses) onto a photosensitive element. In most scanners, the sensing medium is an electronic, light-sensing integrated circuit known as a charged coupled device (CCD). Anything that can fit on a scanner can be scanned in and directly imported into Photoshop for manipulation.
HOW DIGITALCAMERAS WORK
The digital camera has all the same physical parts as the analogue camera, such as lens, shutter and focusing mechanism, but rather than simply having film to react to the light that makes up the image, the camera must have internally all of the electronics necessary to capture the light and change it into a digital image file. In most cameras, the sensing medium is an electronic, light-sensing integrated circuit known as a charged coupled device (CCD). Cameras are connected to a computer and opened in Photoshop for manipulation.
HOW DIGITAL DRAWING TABLETS WORK
The tablet consists of two parts, a flat surface for drawing, and a pen that is programmed to work with the tablet surface. Artists and illustrators use this as an ergonomic method of input into Photoshop
