3. An Image is a picture that depict some real world situation typically captured by a camera.An image can be Continuous Tone, Half-Tone or Bitone. Graphics implies a synthetic pictorial representation.Graphics can be categorized into Raster Graphic and Vector Graphic.
23. Color corrections such as brightness and contrast adjustments, quantization, or conversion to a different color space
24. Intensity Masking: Multiplying Two Images Digital compositing or optical compositing (combination of two or more images). Used in filmmaking to make a "matte"