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Computer Graphics Computer Graphics Bitmap v Vector Graphics Bitmap v Vector Graphics

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Page 1: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

Computer GraphicsComputer Graphics

Bitmap v Vector GraphicsBitmap v Vector Graphics

Page 2: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

Learning Objectives:Learning Objectives:By the end of this topic you should be able to:By the end of this topic you should be able to:

Page 3: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

Learning Objectives:Learning Objectives:By the end of this topic you should be able to:By the end of this topic you should be able to:

describe the describe the difference between difference between VectorVector and and BitmapBitmap graphicsgraphics

Page 4: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

Learning Objectives:Learning Objectives:By the end of this topic you should be able to:By the end of this topic you should be able to:

describe the describe the difference between difference between VectorVector and and BitmapBitmap graphicsgraphics

evaluate their evaluate their suitability for given applicationssuitability for given applications

Page 5: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

Bitmap v Vector GraphicsBitmap v Vector Graphics

Page 6: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

Bitmap v Vector GraphicsBitmap v Vector Graphics

Page 7: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

Bitmap v Vector GraphicsBitmap v Vector Graphics

Page 8: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

Bitmap v Vector GraphicsBitmap v Vector Graphics

Page 9: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

Features of Bitmap GraphicsFeatures of Bitmap Graphics• photographic images photographic images

‒ usually produced by usually produced by scannerscanner or or digital cameradigital camera

• images stored as images stored as pixelspixels‒ ‘‘dots’ on the screendots’ on the screen

• higher number of pixels = better higher number of pixels = better resolution resolution (quality)(quality)

• subtle changes can be made to an image subtle changes can be made to an image ‒ since each pixel is an individually addressable unitsince each pixel is an individually addressable unit‒ e.g. photo editinge.g. photo editing

• bitmap editing software:bitmap editing software:- Photoshop, Paint Shop Pro, Picasa, Paint, Fireworks ….Photoshop, Paint Shop Pro, Picasa, Paint, Fireworks ….

Page 10: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

Bitmap GraphicsBitmap Graphics

Suitability:Suitability: images can be ofimages can be of photographic quality photographic quality images are images are not as precise as vector drawingsnot as precise as vector drawings large amount of disk spacelarge amount of disk space taken up taken up large images take a large images take a long time to load, display & sendlong time to load, display & send images images can be compressedcan be compressed

- take up take up less storage space less storage space & take & take less time to sendless time to send- e.g. e.g. JPEGJPEG image files image files

resizingresizing images can cause distortion images can cause distortion - pixellationpixellation

Page 11: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

Vector ImagesVector ImagesFeatures:Features:• used in used in technical drawingstechnical drawings

– architectural, CAD, 3D modelling/animationarchitectural, CAD, 3D modelling/animation

• object-basedobject-based– shapes: line, circle, rectangle ……shapes: line, circle, rectangle ……

• created by created by mathematical equationsmathematical equations – points described by a relative distance from the origin points described by a relative distance from the origin

• lines/shapes described by features:lines/shapes described by features:– length, thickness, colour …length, thickness, colour …

• vector editing software:vector editing software:- e.g. CorelDraw, AutoCAD, Flash, Fireworks, Illustrator, Freehand, ….e.g. CorelDraw, AutoCAD, Flash, Fireworks, Illustrator, Freehand, ….

Page 12: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

Vector ImagesVector ImagesSuitability:Suitability:

more more accurate drawingsaccurate drawings can be made can be made objects can be objects can be resized without losing clarityresized without losing clarity images take up images take up less memoryless memory and and less disk spaceless disk space 3D images can be created3D images can be created

more powerful computermore powerful computer required required- software needs to recalculate when redrawing/zoomingsoftware needs to recalculate when redrawing/zooming- greater demand on CPUgreater demand on CPU

can’t display photographic imagescan’t display photographic images

Page 13: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

QuestionQuestion

An architect has the choice between saving his plans as a vector or a bitmap graphic.

Giving reasons, identify which he should use. [4]

Page 14: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

Exam QuestionsExam Questions

Page 15: Computer Graphics Bitmap v Vector Graphics. Learning Objectives: By the end of this topic you should be able to:

Exam QuestionsExam Questions


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