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Chapter 4 by Mind Map: Chapter 4

1. Windows formats

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

2. Still image

2.1. Bitmaps(raster)

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

3. Bitmaps

3.1. Advantages

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

3.2. Disadvantages

3.2.1. Large file size

3.2.2. Not easy to make modification to objects/drawings

3.2.3. Resizing a bit mapped image requires either duplicating pixels

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

4. Macintosh formats

4.1. PICT is a versatile format developed by Apple.

5. Natural light and color models

5.1. Additive color

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

5.2. Subtractive color

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

5.3. Dithering

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

6. Vector drawing

6.1. Vector-drawn graphics

6.1.1. Applications of vector-drawn object

6.1.2. How vector-drawn images work

6.1.3. Vector-drawn image versus bitmaps

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

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

6.2.2. graphic artist designing for the print media

7. JPEG(Joint photographic Expert Group)

7.1. Commonly used standard method of compression for photographic images

8. Cross-platform formats

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

9. GIF

9.1. 8-bit per pixel, bitmap image format commonly used by the world wide web

10. PNG

10.1. Support more than 16.7 million colors.

10.2. Use lossless compression technique

11. Image file compression

11.1. Lossless compression

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

11.2. Lossy compression

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

12. Vector graphics

12.1. Advantages

12.1.1. Vector images use less memory space

12.2. Disadvantages

12.2.1. Object/drawing cannot have texture

12.2.2. Cannot be used for photorealistic images