computer graphics using “ adobe photoshop ” introduction to e-learning center, dad presents...
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Computer Graphics Using
“Adobe Photoshop”
Introduction to
E-Learning Center, DAD presentsWorkshop on
Instructor: Mazhar
The creation, display, editing and storage of Images, Illustrations and
Typography with a computer.
What is Computer Graphics ? CG
Graphics technology & Images Editing Design Principals
Composition and Layout Color Theory and Principals
Typography Image Format and Optimization
Computer Graphics demands knowledge of
Bitmap /Raster graphics
Image are broken up into a grid recorded individually ,as Sequence of pixel
Works well for complex variations
Not flexible
Might need a lot of memory
Problems when scaled
Formats: BMP, GIF, JPEG, TIFF
vector graphics
Image are described as a series of lines or shapes
Works well for line art (CAD applications) and images with simple shapes and are flexible
Typically needs less memory
Data: Instructions for drawing lines and filling shapes Example: <line startcoord="x,01 y,01"
endcoord="x, 20 y, 20" thickness="3"
Scalable, versatile
Image Resolution
18 DPI 35 DPI 72 DPI
The number of pixels along the height and width of a bitmap image is called the pixel dimensions of an
image.
The resolution of an image is determined by the number of pixels per inch (dpi, ppi).
Red, Green, Blue
Additive synthesis
Color monitors, Projectors
Perceived color is white when each
component has full intensity, perceived color is black when
each component has no intensity
Color Theory RGB Mode
Cyan, Magenta, Yellow Black
Subtractive synthesis
Color printers
Perceived color is white when each component has no
intensity, perceived color is black when each component
has full intensity
Printing press use four-color printing
Color Theory CMYK Mode
Color Theory HSV mode
Hue, Saturation, Value User oriented, previous ones
were hardware oriented Use color perception quantities:
hue, saturation and value
Hue defines color Saturation refers how far
color is from a gray of equal intensity
Value defines the lightness/brightness of the
color
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