PRESENTED BYE.SANDHYA RANI
07611A0429
GRAPHIC TABLET
A graphics tablet (or digitizer, digitizing tablet, graphics
pad, drawing tablet) is a computer input device that allows one to
hand-draw images and graphics, similar to the way one draws
images with a pencil and paper
These tablets may also be used to capture data or
handwritten signatures.
It can also be used to trace an image from a piece of
paper which is taped or otherwise secured to the surface.
Capturing data in this way, either by tracing or entering the
corners of linear poly-lines or shapes is called digitizing.
A graphics tablet (also called pen pad or digitizer)
consists of a flat surface upon which the user may "draw" or
trace an image using an attached stylus, a pen-like drawing
apparatus
EVOLUTION PATH TO GRAPHIC TABLET
o Telautograph by Elisha Gray in 1888.
o Stylator in 1957
o Grafacon (for Graphic Converter) in 1964
o RAND Tablet
o Other graphics tablets are spark or acoustic
tablets
DESIGN CONSIDERATIONS OF GRAPHIC
TABLET
i. Size
ii. Interface
iii. Pen/stylus
iv. Accessories
v. Pressure sensitivity
SIZE Size is one of the first factors you'll need to consider in choosing a tablet.
Bigger is not necessarily better.
The larger your tablet surface is, the more you will need to move your
arms.
The price escalates as the size increases.
the most common sizes are 4" by 5" and 6" by 8“.
The actual footprint of the tablet can be as much as 4 to 5 inches larger
than the input area.
INTERFACEo The interface is how your tablet connects to your computer.
o Most tablets these days have a USB interface which is ideal since
most computers in use today support USB.
o USB devices are hot swapable so you'll be ale to move the tablet
more easily for use on multiple computers.
o If you have a very old computer that does not support USB, you'll
need to choose a tablet with a serial interface.
o Bluetooth is another option for connecting a graphics tablet to your
computer without the use of wires.
o Bluetooth is a wireless protocol frequently used for connecting
electronics devices.
PEN/STYLUS
Tablet should come with a pen that feels comfortable and natural
in your hand.
Many pens will also have a switch or buttons built onto the pen,
and some pens have an erasing end.
This is an excellent feature because the buttons can be
programmed for specific functions such as a right-click or double-
click, and the erasing tip can perform a delete function in one
swipe, or automatically activate the eraser tool in your graphics
software.
ACCESSORIES
Some tablet manufacturers offer additional pens and
other pointing tools that you can program independently.
When using these optional accessories, your tablet
should recognize it as a new tool and use the customized
preferences you have specified for that specific tool.
PRESSURE SENSITIVITY
Pressure level refers to the sensitivity to pressure on the
surface of the tablet.
Most tablets have either 256, 512, or 1024 pressure
levels. The pressure-sensitivity can control line
thickness, transparency, and/or color.
The higher the pressure-sensitivity, the more responsive
and natural your tablet will feel and the more control you
will have.
TYPES OF GRAPHIC TABLET
1) Passive Tablet
2) Active Tablet
3) Optical Tablet
4) Acoustic Tablet
5) ElectroMagnetic Tablet
6) Capacitive Tablet
USAGE OF PEN ON GRAPHIC TABLET
a) Holding the penb) Positioningc) Single clickd) Double clicke) Draggingf) Pressure sensitive painting
g) Touch key & touch strip
HOLDING THE PEN The pen will take effect when it comes within 7mm above the
tablet. While using the pen, be sure that your thumb or index finger
can easily control the button on the pen, which acts as the right-click key of a mouse.
SINGLE CLICK
One slight touch of the pen on the tablet has the same
effect as a single left-click of the mouse
DOUBLE CLICK TECHNIQUE When the cursor is positioned, press the tablet twice immediately with the
pen tip, making sure that you do not move the pen tip.
The response for the double click can be slow for beginners. You can solve
this problem by adjusting the double click speed from the normal setting of
the tablet.
DRAGGING
Select a target by pressing the pen down on it, and do not release the
pen till you have moved the target to the new position you want.
POSITIONING Moving the pen in the active area of the tablet will control the cursor’s position on
the computer screen. This means the active area of the tablet represents the entire computer screen.
Moving the pen on the tablet creates a corresponding movement of the cursor on the screen.
Pressure Sensitive Painting In applicable software, you can use the pressure sensitivity of the pen to control the
painting brushwork for different effects such as direction, stroke width, colour and thickness.
The software that supports pressure sensitivity includes Adobe Photoshop, Painter, Flash, Ulead Photo Impact, Art Dabbler etc.
Touch key and Touch Strip Touch keys are programmable for modifier keys, keyboard shortcuts, mouse clicks,
open/run applications, and pop-up menus. The default is Rubber, Alt, Shift and Space.
The touch strip is used for quick scrolling, zooming, controlling brush size, and other functionality by user configuration.
SIMILAR DEVICES Interactive whiteboards offer high resolution wall size graphic
tablets up to 95" along with options for pressure and multiple input.
These are becoming commonplace in schools and meeting rooms
around the world.
Touch screens like those found on some Tablet PCs and the
Nintendo DS are operated in similar ways, but they usually use
either optical grids or a pressure sensitive film instead, and therefore
they do not need a special pointing device.
Audio Haptic products where blind or visually impaired people
touch swelled graphics on a graphic tablet and get audio feedback
from that.[18] The product that is using this technology is called
Tactile Talking Tablet or T3.
Thank you