Digital Multimedia

Agenda

• Bitmapped images
  • Resolution
  • Resampling
  • Manipulation

Resolution

• Device resolution
• Image resolution

\[ \text{Physical dimension} = \frac{\text{Pixel dimension}}{\text{Pixel density}} \]

Resampling

• scaling
• Interpolation schemes
  • Nearest neighbour
  • Bilinear
  • Bicubic

Compression

• Lossless
• JPEG as lossy compression

Image manipulation

• Layers
• Selection
• Masks
• Pixel point processing
• Pixel group prosessing