Lesson 7 - Rendering and Scanning

Lesson 7

Rendering and Scanning

Rendering
- Derivative file is fixed until saved
- Rendering engines all have different default settings
- Proxy file - Preview of image : fixed rendering
- RAW file is viewed as line rendering/ JPG Preview

Scanning

Reflective - Printed Material/ Hardcopy
- Line art
- Continuous tone
- Half tone

Transparent - Eg Film
- Negative
- Positive

OCR - Optical Character Recognition
- Scan as a bitmap and it analysis and finds letters and converts to word document


Types of Scanners

Flat bed scanners (low-med cost)
- Reflective originals
- May handle transparent images

Film Scanners (med-high cost)
-35mm/medium format/ large format

Drum Scanners (very high cost)
- Transparency
- other 'Imacon Flextight' high cost

Scanner specifications

Optical resolution
- Scanning above the optical resolution leads to interpolation

Dynamic Range
-Density difference between lightest and darkest part of original that can be captured
-Higher value captures batter highlight and shadow detail




Non Destructive Image Editing 3

1. What model does cataloguing software use?
A library model

2. Where are the images stored in a catalogue based system?
Folders, drivers, databases, store anywhere on computer

3. Where does the catalogue get its initial information about the files?
By reading the meta data

4. Where does the cataloguing software store this information?
In a central database or cache

5. What is the main organising principle of browser based systems?
The user organises it not the system

6. How do cataloguing systems organise the images?
By recording meta data in the database

7. How does a cataloguing system make changes to an image?
By editing meta data then saving it to the database

8. Can other programs see these changes?
no

9. How does a cataloguing system make changes to an image available to other programs?
Saving metadata as sidecar file or saving a dirivative file

10. List 5 advantages of cataloguing based PIE software
- Associates all the info with only one file
- Can create groups of images
- Can work with offline images
- Eases back up and restoration tasks
- Creates multiple output types from one source

11. Give two examples of software that combine image cataloguing and image editing functions
- Adobe Lightroom
- Adobe Aperture