A graphics tablet is a computer input device which replace hand-drawing. User can draw directly to computer like if he was drawing on a paper or any other material. These tablets are also used to subscribe some documents or in East Asia to capture local handwriting.
Another thing that tablets can do is digitizing. It´s process which trace an image from piece of paper.
Parts of hardware[change | edit source]
Surface[change | edit source]
Tablet itself consist flat surface on which can user draw. This surface has many size or shapes. Images drawn on tablet are not shown on surface itself but they appears on the monitor. However there are screen hybrids which allow user to see drawing right on the drawing surface. These hybrids are combination of an ordinary tablet and touch screen (unlike touch screen, they offer pressure sensitivity and higher resolution).
Stylus[change | edit source]
Stylus is a pen-like device (often powered by battery) that allow transmitting user action to the tablet. It detect different degrees of pressure, e.g. for use in a drawing program to differentiate line thickness or color density.
Puck[change | edit source]
After stylus, pucks are the most commonly used tablet accessory. A puck is a mouse-like device that can detect its absolute position and rotation. Professional pucks often have loupe for greater precision
Category[change | edit source]
Passive tablets[change | edit source]
These make use of electromagnetic induction technology. The tablet generates an electromagnetic signal, which is received by the circuit in the stylus. The wires in the tablet then change to a receiving mode and read the signal generated by the stylus.
Active tablets[change | edit source]
Stylus use self-powered electronics that generate and transmit a signal to the tablet. Tablets may listen for pen signals constantly, so it eliminate inaccuracy of transmission.
Optical tablets[change | edit source]
Optical tablets operate by a very small digital camera in the stylus.
Acoustic tablets[change | edit source]
These were early models. A small sound generator was mounted in the stylus, and the acoustic signal picked up by two microphones placed near the writing surface.
Electromagnetic tablets[change | edit source]
Electromagnetic tablets work by generating and detecting an electromagnetic signal.
Use[change | edit source]
Since stylus can sense a pressure, tilts and other attributes, its great for computer graphic usage (especially two dimensional). These attributes can make differences between brush size, opacity, shape, color, etc. in certain graphic programs.
Graphics tablets are very welcome in the artistic world and also for technical drawing and Computer-aided design.
They are also used for online teaching, e. g. live tutorials or lessons where visual information is needed.
Manufacturers[change | edit source]