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Chapter 4 by Mind Map: Chapter 4

1. Macintosh formats

1.1. PICT is a versatile format developed by Apple.

2. Natural light and color models

2.1. Additive color

2.1.1. In the additive color method, a color is created by combining colored light sources in three primary colors-red, green, and blue (RGB)

2.2. Subtractive color

2.2.1. In the substrate color method , color is created by combining colored media such as painted or ink.

2.3. Dithering

2.3.1. Usually, digitized images are 24 bit, 16 million color depth.

3. JPEG(Joint photographic Expert Group)

3.1. Commonly used standard method of compression for photographic images

4. Cross-platform formats

4.1. JPEG, GIF, and PNG- Most commonly used format on the Web

5. GIF

5.1. 8-bit per pixel, bitmap image format commonly used by the world wide web

6. PNG

6.1. Support more than 16.7 million colors.

6.2. Use lossless compression technique

7. Image file compression

7.1. Lossless compression

7.1.1. Every single bit of data that was originally in the file is uncompressed. All of the information is completely restored

7.2. Lossy compression

7.2.1. Reduces a file by permanently eliminating certain information, especially redundant information.

8. Vector graphics

8.1. Advantages

8.1.1. Vector images use less memory space

8.2. Disadvantages

8.2.1. Object/drawing cannot have texture

8.2.2. Cannot be used for photorealistic images

9. Windows formats

9.1. The most commonly used image file format on Window is DIB, also known as BMP

10. Still image

10.1. Bitmaps(raster)

10.1.1. Bitmap is a simple matrix of the tiny dots that form an image and are displayed on a screen or printed

11. Bitmaps

11.1. Advantages

11.1.1. Can have different textures on the drawing ; detailed and comprehensive

11.2. Disadvantages

11.2.1. Large file size

11.2.2. Not easy to make modification to objects/drawings

11.2.3. Resizing a bit mapped image requires either duplicating pixels

11.2.4. Graphics become "blocky" when the size is increased.

12. Vector drawing

12.1. Vector-drawn graphics

12.1.1. Applications of vector-drawn object

12.1.2. How vector-drawn images work

12.1.3. Vector-drawn image versus bitmaps

12.2. Vector-drawn images are used in the following areas

12.2.1. Computer-aided design (CAD) programs needed by architects and engineers

12.2.2. graphic artist designing for the print media