APPENDIX B

image

Graphics Refresher

It is assumed throughout this book that the reader has a basic understanding of 3D graphics but we will refresh memories of some relevant topics in this appendix.

Pixels

When we digitally represent an image on a computer screen, it is composed of a rectangular grid of individual points of color known as pixels. This type of a representation is known as a raster graphic or bitmap. How true to the original image the displayed image appears depends on the number of pixels on the screen: the resolution. In Figure B-1, we show an input image on the left, a 4 × 4 pixel grid representation in the center and a 16 × 16 grid ...

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