Multimedia Chapter 3

What is the purpose of surface definition in 3-D graphics?

• Translate 3-D information to a 2-D image

• Create a diorama with 3D objects, lights, and cameras

• Specify the shape of the 3-D object

• Apply lighting and shaders to the object

Which technique is used to create objects with soft edges in 3-D graphics?

• Metaball modeling

• Polygon modeling

• Formula modeling

• Spline modeling

What is the main advantage of vector graphics over bitmapped graphics?

• Large file sizes

• Precise editing control

• Easily scaled objects

• High-quality, realistic surfaces

What is the main disadvantage of bitmapped images?

• Device-independent

• Inaccurate representation of complex contone images

• Loss of precise shapes when scaled or rotated

• No photo-editing capability

Which file format is commonly used for lossy compression of graphic files?

• PICT

• BMP

• TIFF

• JPEG

What is the process of adding samples to a file to increase its resolution?

• Upsampling

• Downsampling

• Resampling

• Indexing

Which type of graphics uses a series of four-color dots of transparent inks?

• Vector graphics

• Line art

• Color images

• Bitmapped graphics

What is the main advantage of line art in bitmapped images?

• Excellent representation of black and white photos

• Small file size

• Lower printing costs than color

• Clear, crisp image

Which step in creating 3-D images involves specifying the shape of the 3-D object?

• Modeling

• Scene composition

• Rendering

• Surface definition

What is the main challenge of computer images related to large file sizes and slow downloads?

• Device-dependence

• File format compatibility

• Color banding

• Quantization