Imaging Systems Architecture
Same image on different devices
Common imaging model for all applications
Common code for all applications
Applications
Text Editors and Formatters
Illustration Editors
Page Layout
Book Layout
Same Image Different Devices
Workstations
Black/White or Color Monitors
40 spi to 300 spi
Printers
Black/White or Color
Different Technologies
150 spi to 2500 spi
Range of Performance Criteria
Workstations
Interacitive WYSIWYG
Soft Printer
Printers
Mastermaker
Production Printer
Common Imaging Model (HummingBirdSlide.ip)
Device Independent
Uniform Set of Operations
2D with Priority
Graphic Arts Quality
Common code for all Devices (Imager building blocks sequence)
Interface and Implementation (Imager.jam)
Common Interface
Shared Implementation Pieces
Specialized as Needed
Ubiquitous
Extensible
Examples
Printer
Displays
Display List
PDL Recorder
Integration
All Applications use common model
No duplicated effort
No surprises
Encapsulate model for basic interchange
PDL
Augmented PDL
Display list
Imaging Model (ClassicBird.ip)
Color Pressed Through Mask
Mask: Geometric Shape
Color: Constant or Sampled
Makes Image on Page
New Images Overwrite Old Ones
Overview
Shape Specification
Color Specification
Imaging Operators
Special Rendering Issues
Impossible Compromises
Conclusions
Masks (Shapes.jam)
Filled Areas
Strokes (LineParams.jam)
Offset curves
Joints, ends
Dashed patterns (Dashed.jam)
Sampled Mask (BirdBits.ais)
Shape Specification
Segment (CurveDefs.jam)
Trajectory (BirdShape.jam)
Outline (BirdHoles.jam )
Pixel Arrays (RainbowBird)
Text (ShoreBirds.jam)
Fonts: Masks plus Metrics (FontDef.jam)
Show Operator (ShowDef.jam)
Correct
Color Types (ClassicBird.ip)
Constant Color
Pixel Value
Color Operator
[1,0,0] RGBOperator
Sampled Color (SampledColor.jam)
Pixel Array
Transformation
Color Operator
Color Specification
Color Model (ColorDefs.jam)
Parameters + Model
Produces Color Operator
Find Color
Specified by Name
Functional Colors
Other Imaging Operators (ClassicBirdClipped.ip)
Clipping
Any Shape
Affects All Masks
Transformations
All Affine Transformations
Scale, Rotate,Translate, Skew
Imager State Variables
Get and Set Values
Includes
Current Position
Transformation
Font
Color
Clipper
Correct Parameters
Basic Rendering Primitives
Fill Algorithms (Fill.jam)
Parity or Wrap number
Specifying holes
Strokes (LineParams.jam)
Variable Widths
Ends and Joints
Dashes
Sampling
Quality
Speed
Special Rendering Issues
Fonts (FontScan.ip)
Quality Scan-conversion
Proprietary Algorithms
Color
Color Printing
Additive vs. Subtractive
Impossible Compromises
Performance
Caching
Special Case Algorithms
"Interactive" Modes
Resolution too Low
Readable Fonts (jaggy fonts)
Effective Halftoning (quantized gray wedge)
Lack of color
Capture Intent (aic4.ip)
Functional Specification
Conclusions
Effective basis for document preparation systems
Commercially Available
Same Image on Different Printers
Same Image on Printers and Displays
Only in R&D
Common Code for all Applications
Integrated Set of Applications