Bitmap vs Vector Graphics Computer graphics falls into two main categories Bitmap images Vector images Bitmap images Created using a square or rectangular grid of colored squares called pixels ID: 814522
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Slide1
Bitmap vs. Vector
Objective 1
Slide2Bitmap vs. Vector Graphics
Computer graphics falls into two main categories:
Bitmap images
Vector images
Slide3Bitmap images
Created using a square or rectangular grid of colored squares called pixels.
Pixels: tiny dots of individual color that makes up what you see on your screen. Tiny dots come together in the form of the images you see.
When the image is enlarged, you can see each individual square dot of color
.
The number of pixels in a given inch are referred to as the image’s resolution.
Slide4Bitmap images
Bitmap images are resolution dependent.
Resolution: # of pixels in an image.
Stated in:
Dpi (dots per image)
Ppi
(pixels per image)
Its difficult to increase or decrease the size of an image without sacrificing a degree of image quality.
Reducing the image: throws away pixels.
Increasing the image: creates new pixels.
Slide5Common Bitmap formats
.
bmg
.gif
.jpg
.tiff
.
psd
Slide6Popular Bitmap imaging software
Microsoft Paint
Abobe
Photoshop
Corel Photo-Paint
Slide7Bitmap images
All scanned images are bitmap
Digital camera images are bitmap
Images can be converted from one format to another.
Slide8Vector images
Graphics created in Adobe Illustrator are vector graphics.
Made
up of many individual, scalable objects.
Objects indentified by mathematical
objects
rather than pixels.
Always render the highest quality.
Objects consist of:
Lines
Curves
Anchor points/paths
Shapes with editable attributes: such as color, fill, and outlines.
Slide9Vector images
Changing the attributes of a vector object does not affect the object itself.
Freely change any # of object attributes without destroying the basic object.
Vector images are resolution independent.
Increase or decrease the size to any degree and your lines will remain crisp and sharp on screen and print.
Slide10Vector images
Fonts are a type of vector object.
Vector images are not restricted to a rectangular shape like bitmap images
.
Used to create logos
Disadvantage of vector images: unsuitable for producing photo-realistic imagery
.
Vector graphics are termed resolution-independent
This means that any graphic tha
t you create in Illustrator can be output to fit on a postage stamp or on
a billboard.
Slide11Vector image formats:
AI (Adobe Illustrator)
CDR
CMX
Slide12Popular Vector Drawing Software
Adobe Illustrator
CorelDRAW
Xara
Xtreme
Serif
DrawPlus
Slide13Two categories of Graphic Software
Image editors (pixel/bitmap based)
Illustration software (vector-based)
Slide14Image Editors
Most popular type of graphics software
Also known as paint applications
Allows you to create bitmap-based images from scratch using a variety of painting tools intended to mimic natural painting tools.
Most image editors include features for photo enhancement and retouching
Advantage: you can get a great deal of detail, as much as a photograph.
Disadvantage: confined by the pixel resolution of the image.
Slide15Illustration software
Because they consist of points and objects rather than pixels on a grid, they are free from the confines of pixel resolution.
Cannot contain the high level of detail as bitmapped images so they often have a cartoon-like appearance.
Most often used to create stylized, cartoon-like images, logos, maps, and other design elements that need to be output at any size.