MT-Lecture4

Introduction to Image in Multimedia




Course Name: MULTIMEDIA TECHNOLOGY (INT207)Chapter: 3 - Image in MultimediaLecture: 4 - Image Fundamentals and CreationInstructor: Dr. Sumera Ahmad


Fundamentals of Image Creation - slide 4

Resolution:

  • Defined as the sharpness of an image.

  • Determined by the number of pixels an image holds.

Color and Pixelation:

  • All pixels contribute to the image.

  • High pixel density results in clear, high-resolution images with accurate colors.

Configuring the Computer Workspace - slide 8

Workspace Definition:

  • Contains source files, output files, and simulation results.

Creating Workspaces:

  • Use the New Workspace Wizard for creating new workspaces.

Components Management:

  • Manage various components of the workspace efficiently.


slide 9 is missing but needed..


Types of Images - slide 10

Major Types:

  • Vector Images: Digital art rendered with mathematical formulas.

  • Raster Images: Comprised of pixels containing color and tonal information; resolution dependent.

CREATION OF IMAGES: SLIDE 11

-TYPE OF STILL IMAGES:

-3-D DRAWING AND RENDERING..

Ways to Create Images - slide 12

Image Creation Methods:

image is created in two ways:

  • Bitmaps and Vector-drawn graphics.

slide 9, 13, 14, 16, 19, 21 missing..

Subtractive Color Method - SLIDE 18

Color Creation in Media:

  • Combines colored media like paints/inks.

Absorption Process:

  • Colored media absorbs parts of light spectrum and reflects others.

Printing Process:

  • Utilizes halftone dots of cyan, magenta, and yellow (CMY).

Dithering Process - SLIDE 21

Definition:

  • Adjusts color values of pixels to create to the closest matching color value in the target palette.

Purpose:

ØDithering is the process by which we create illusions of the color that are not present actually. It is done by the random arrangement of pixels.

  • Creates color illusions that aren’t present, using pixel arrangements.

Implementation:

  • Achieved through mathematical algorithms.

Full-Color Images and Dithering - SLIDE 22

Color Range:

  • Full-color photographs contain a vast range of color values.

Function of Dithering:

  • Approximate unavailable colors by mixing existing ones, especially under 256 color conditions.

Dithering Techniques SLIDE 23

  • Focuses on methods and techniques used in dithering images.

Dithering Patterns SLIDE 24

Methodology:

  • Randomized patterns to reduce color transition harshness.

Impact on Image Quality:

  • Can introduce graininess and reduce sharpness, particularly visible in downsampled images.