Chapter 3 Images Yaqoob AlSlaise ITBIS 351 Outline

Chapter 3: Images Yaqoob Al-Slaise ITBIS 351

Outline Work out your graphical approach by planning your approach Organizing your tools Configuring your computer workspace Differentiate among bitmap, vector, and 3 -D images Describe the use of colors and palettes in multimedia Cite the various image file types used in multimedia

Plan your approach

“ The organizing and creative process begins with drawings in pen or pencil on paper. Too many times we are enthused about the color and the computer graphics tools, but they can ” overwhelm the creative design process. - Dennis Woytek, Assistant Professor, Duquesne University

Organize your tools O Many multimedia designers do not limit their toolkits to the features of a single authoring platform. O They employ a variety of applications and tools to accomplish many specialized tasks.

Configure Your Computer Workspace O Have more than one monitor to provide lots of screen real estate (viewing area).

Making Still Images O Still images are generated in two ways: O Bitmaps O Vectors

Bitmaps O Used for photo-realistic images and for complex drawings requiring fine detail. O Uses ‘Painting’ software i. e. Adobe Photoshop, Paint, etc. O Are used in many file formats including: . BMP, . GIF, . JPG, . PNG

Bitmaps

Bitmap sources O Make a bitmap from scratch with a paint or drawing program. O Grab a bitmap from an active computer screen with a screen capture.

Bitmap sources O Capture a bitmap from a photo or other artwork using a scanner to digitize the image. O Once made, a bitmap can be copied, altered, e-mailed, and otherwise used in many creative ways.

Morphing O http: //youtu. be/KVRQ 0 v 15 lrc

Morphing

Vector Drawing O A vector is a line that is described by the location of its two endpoints.

Try @ Home Type the following in Notepad: <svg xmlns="http: //www. w 3. org/2000/svg" xmlns: xlink="http: //www. w 3. org/1999/xlink" width="200" height="200" view. Box="-100 300 300"> <rect x="0" y="0" fill="yellow" stroke="red" width="2002" height="100"/> <text transform="matrix(1 0 0 1 60 60) " font-family=" 'Times. New. Roman. PS-Bold. MT' " fontsize="36">SVG</text> </svg> Save as (. svg) file then open on an HTML 5 compatible browser

SVG O SVG: Scalable Vector Graphic O Small in size and can be scaled without distortion. O Supported by mobile browser as an alternative to Flash.

Converting between Bitmaps and Vectors O From Vector to Bitmap Easy to do with drawing software O Bitmap to Vector Autotracing ( Can cause great inflation of file size!)

3 D Drawing and Rendering

Z axis

Working in 3 D O 3 D applications create scenes. O Scenes consist of numerous objects, the more objects in the scene, the more complex and realistic the scene is. O Objects are created by modeling them.

3 d Modeling

Making models realistic O Texturing: Applying images as a skin to models to make them look real.

Making models realistic O Lighting: Setting the mood of the scene or to simulate the environment in a realistic manner.

Making models realistic O Rendering: When the computer uses intricate algorithms to apply the effects you have specified on the objects you have created.

Computerized Colours

Additive Colours O a color is created by combining colored light sources in three primary colors: red, green, and blue (RGB).

Subtractive Colours O Colour is created by combining colored media such as paints or ink that absorb (or subtract) some parts of the color spectrum of light and reflect the others back to the eye. O Subtractive color is the process used to create color in printing (CYMK).

CMYK

Computer Colour Models O RGB hexidecimal

Computer Colour Models O HSB (Hue, Saturation, Brightness)

Computer Colour Models O HSL (Hue, Saturation, Lightness)

Colour Palettes O Palettes are mathematical tables that define the color of a pixel displayed on the screen Microsoft Macintosh Web Safe

Color Depth

Dithering

Image Formats Forma Color t Depth Compressi on Transparen cy Uses • . JPG 24 bit (16. 7 million colours) Lossy Does not support Rich color photograph s • Gradients • Web images . BMP 24 bit Lossless Does not support • Native format for Windows . PNG 8 bit – 24 bit Lossless Supports • Logos • Free format • Does not support Animation . GIF 8 bit (256 colors) Lossless Supports • • Logos Animation