Multimedia Outline … 

Media and Data  Streams

Media 

Media means to distribute and present information
- text
- Graphics
- Pictures
- Voice
- Music

It is delivered from the Latin  word Medium
Attributes of media
- perception media- seeing and hearing
- representation media – ASCI , PCM and MPEG
- presentation media – output paper, loudspeaker , keyboard, and camera
- storage media – hard disc , CD
- transmission media –radio, coaxial cable
- information exchange media –electric magnetic wave
- presentation spaces and presentation values
- presentation dimensions – 2D,3D and holography 

Type of Data Stream 

1.Asynchronous: communication with no timely restrictions
2.Synchronus : Synchronous communication requires the sending and receiving ends to share timing; each bit will come through in the appointed time slot.
3. isochronous = equal time
eg. video conference = steady data ok / small blips = tolerable / long pause = not tolerable
asynchronous = not sync
eg. email, newsgroups, bbs, forums
synchronous = sync
eg. normal telephone line, chat rooms

Computer Image Processing

1.Image synthesis
    click facilities to allow users to select menu items , icons and objects of the stream
2.Office automation and electronic publishing
    tables and graphs
3.simulation and animation for scientific visualization and Environment
    animated movies , cartoon characters 

Tools in Photo Shop 

       Move tool : enables you to move images or objects
Elliptical marquee tool : Enables you to make a circular or elliptical selection
Single row marquee tool : enables you to make a simple row selection 
Single column marquee tool : enables you to make a single column selection 
Lasso tool : enables you to make a free form selection with a mouse click
Polygonal lasso tool – enables you to make a straight edge selection 
Magnetic lasso tool – enables you to make an automatic free from selection on edges 
Quick selection tool – enables you to make quick selection with a brush tip
Magnetic wand tool – enables you to select similar colors in an image 
Crop tool – enables you to crop an image 
Eraser tool – enables you to erase some region from an image 
Background eraser tool  - enables you to erase pixels from similar colored areas 
Blur tool – enables you to blur an image 

Panels 
          Panels helps us to monitoring and modifying our work

1.layer panel : allows you to arrange and create layers in your drawing 
2.Channel panel : allows you to create and manage channels 
3.color panel : allow you to select a color mode such as RGB CMYK
4. The history panel : allow you to jump to any recent state of an image
5. The brushes panel : numerous options to set brush such as color dynamics, brush shapes 
6.Actions panel  : Displays built-in as well as user defined actions 


working with files 
Name  : Allows you to give an appropriate name to the new document 

Preset : Allows you to create a new document with built –in dimensions and color mode 

Width and height : allows you to specify the width and height of the new file 

Resolutions : allows you to specify the number of pixels per inch in the final printed page


Working with images 

    An image is a representation of a real or imaginary living or non-living object 
Image size : It allows you to specify the user- defined size for the image and change the resolution of the image 
               
Editing images 
There are different ways to edit an image 
1.flopping an image  : flopping and image means  turning over an image horizontally or vertically 

2.Rotating an image : In photo shop you can rotate an image at a predefined angle or at an angle of your choice 

3. cropping an image : cropping  is the process of removing unwanted portions from the image 

Color modes : color mode stands for color model 

1.RGB : It refers to the mode where all the colors used in an image are defined as combination of red, green, and the blue colors 

2.CMYK : It refers to a printer friendly color mode 

3.Indexed : It provides up to 256 colors 
4. Gray scale : It provides a black and white image 

5. bitmap : provides best results for line drawings 

6.LAB : Luminosity measured from 0 to 100 percent 


Selecting foreground and background 

To change the foreground color click the foreground icon to display the color picker dialog box . Then select a new color in the color palette r click any where in an open image window with the eyedropper tool, you can set the foreground color by clicking a swatch in the swatches  palette 


Background color 
                     To change the back ground color click the background color icon by using the color palette , clicking a swatch in the swatches palette or Alt-click any open image window with the eyedropper tool


Making selection 

   What portion of your image or layer that you want to address 

Selection tool in photo shop 
1.Rectangular marquee tool 
                           It is a rectangular tool, it is used for selecting an image or part of an image in rectangular way

2.Elliptical marquee tool 
]                        This tool is used to select portions of an image in the elliptical or circular shapes 
3. single row marquee tool 
                           This tool is used to select a single row of pixels of an image 
4.single column marquee tool 
                         This tool is used to select a single column of pixels of a image
5.lasso tool : These tools are used to make free hand selection in an image/ 

6.magic wand tool : this tool is used to select objects in a document with the same or similar fill color stroke weight, stroke color capacity or blending modes

7.pen tool : It is the most accurate and versatile of the selection tool . you use the pen tool to create a path, which is an object oriented breed of selection outline 

Shape tools
To draw paths in sample geometric shapes – rectangles, polygons and so on – give the shape tools

Painting tools 

       Brush tool, color replacement tool , history brush tool , gradient tool and paint bucket tool 

1.Bush tool
                   The brush tool is used to draw lines of various thickness and colors 

2.Gradient tool: the gradient tool creates a gradual blend between multiple colors

3.Color replacement tool : This color replacement tool works by taking a color sample form the area in which you first click and the then applying the foreground color in any area that matches the sample 

4.History brush tool : This tool to restore the portion of an image to an earlier stage 

Drawing tools : draw elementary shapes such as rectangles , rounded rectangles ,lines ,polygons ,circles, ellipses etc


Layer :
       A layer is simply one image stacked on the top of another image 

layer palette : the layer palette is the grand central station for managing layers 

working with layers 

       when we create a new image with a while background or colored background ,the lower most image in the layer palette is called background . we can work with different layers of an image consisting  of multiple layers through the layer palette 

hiding layer 
          This layer and every thing contained within it will be accessible, but the layer will not show until you choose the unhide it , this is a good solution for testing changes to your image without deleting or losing image elements

Showing layer 
    You can temporarily hide or show a layer by clicking on its icon on the left of the layer in the layer palette 

Deleting layer 
       Layers are essentially separate images unto themselves . if something on a layer does not work and you want to delete it 

Repositioning layers
    Layers would be rather limited in terms of enabling you to rearrange your image content if your could not change their stacking order 

Flattering images 
           When you are creating images that share with another person , file size and compatibility become issues that you need to deal with, but it your image is completed and your intended recipient requests a flattered file you can use flattering image