sanju ppt

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.

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