week 3 -Facilitator

Vector and Bitmaps

The follwing links are the answers for week 3 assessment

The differences between bitmap and vector graphics
http://www.prepressure.com/image/bitmapvector.htm
http://www.prepressure.com/image/bitmapvector2.htm
http://www.eastbywest.com/pub/vectorbitmap/

Four different graphic elements

Background-Bitmap files are more suitable for photo-realistic images that require complex color variations, and it shows more details.

Buttons- For web buttons, vector files are more suitable. It is because of the size of vector graphic is much more smaller compare to bitmap graphics.

Icons-Vector files are easy to be create and it is scalable without losing its quality.

Text-Vector files are more suitable for text illustrations that require precise measurements (lines, curves, boxes and shapes)


Extra notes (From "Multimedia:Making It Work" 6th edition, by Tay Vaughan)

The capabilities and limitations of bitmap images

1. Bitmaps are an image type most appropriate for photo-realistic images and complex drawings requiring fine details
2. Limitation of bitmapped images include large files sizes and the inability to scale or resize the image easily while maintaining quality
3. A bitmap is a simple information matrix describing the individual dots of an image, called pixels
4. The image’s bit-depth determines the number of colors that can be displayed by an individual pixel
5. You can grab a bitmap image from a screen, scan it with a scanner, download it from a website, or capture it from a video capture device
6. You can then manipulate and adjust many of its properties, and cut and paste among many bitmaps using specialized image-editing programs
7. When you import a color or gray-scale bitmap from the Macintosh to Windows, the colors will seem darker and richer

The capabilities and the limitations of vector images

1. Vector images are most appropriate for lines, boxes, circles, polygons, and other graphic shapes that can be mathematically expressed in angles, coordinates, and distances
2. A vector object can be filled with color and patterns, and you can select it as a single object
3. Vector-drawn objects use a fraction of the memory space required to describe and store the same object in bitmap form
4. For the Web, pages that use vector graphics in plug-ins such as Flash download faster and, when used for animation, draw faster than bitmaps
5. Most drawing programs can export a vector drawing as a bitmap
6. Converting bitmaps to vector-drawn objects is difficult; however, autotracing programs can compute the bounds of shapes and colors in bitmapped images and then derive the polygon object that describes those bounds
7. Vector images require a plug-in (such as a Flash player) for display on a web page
8. Vector images cannot be used for photo-realistic images