2.1. Introduction2.2. What Is Different about Multimedia Data?2.3. Multimedia Metadata2.4. Image Data2.4.1. History of the Pixel and Digital Images2.5. Multimedia Data Acquisition2.6. Multimedia Data Transformation2.6.1. ResolutionColor DepthImage ChannelsContrast CorrectionDitheringLayers2.6.2. DeliveryInternet and ICT ApplicationsMIME Types2.6.3. Compression2.7. Color Perception2.7.1. CIE_XYZ Color-space2.7.2. RGB Additive Color from Glowing Bodies, Lights, TVs, and Monitors2.7.3. CMYK: Subtractive Color from Reflecting Objects—Color Printing2.7.4. HSB System (Hue, Saturation, and Brightness)2.7.5. RYB (Red, Yellow, and Blue)2.7.6. Comparing the Four Models2.8. Real-time Media2.8.1. Seeing Video2.8.2. Audio2.8.3. Video and Audio Streaming2.8.4. What Is Available?2.8.5. 3GP Standards2.9. What Is Metadata?2.9.1. Generating and Extracting Metadata2.9.2. Image MetadataResource Description Framework (RDF)2.9.3. Image Metadata Format2.10. Summary