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Digital Reformatting of Photographic Formats -2-. Aaron Choate Digital Library Production Services The University of Texas Libraries. Quality Control. quality control Prerequisites. Identify your products and goals. quality control Prerequisites. Agree on your standards

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digital reformatting of photographic formats 2

Digital Reformatting of Photographic Formats-2-

Aaron Choate

Digital Library Production Services

The University of Texas Libraries

quality control prerequisites
quality controlPrerequisites
  • Identify your products and goals
quality control prerequisites1
quality controlPrerequisites
  • Agree on your standards
  • Determine a reference point
  • Understand the limitations of current knowledge, practice and technology
quality control setting up your qc program
quality controlSetting up your QC program
  • Identify Scope
    • Whole collection or a sample of images?
quality control setting up your qc program1
quality controlSetting up your QC program
  • Determine methods
    • View the image at 100%
    • Use grayscale and color targets to evaluate color visually
    • Use histograms
    • Examine printouts
quality control setting up your qc program2
quality control Setting up your QC program
  • Control the QC environment
    • Hardware configuration
      • Sufficient RAM
      • Fast enough processor
      • Large enough monitor
        • (CRT vs LCD)
quality control setting up your qc program3
quality control Setting up your QC program
  • Control the QC environment
    • Image-display software
      • Choose a software package that is known to display images accurately
        • (Photoshop is a good bet… )
quality control setting up your qc program4
quality control Setting up your QC program
  • Control the QC environment
    • Monitor set-up
      • Calibrate your monitors regularly
      • Gamma should be set to 2.2
      • White point temperature should be set to 5,000 kelvin (noon day sun)
    • Let the monitor warm up for at least 30 minutes
    • Reduce the room’s lighting levels if possible
    • Clean your screens …
    • Avoid turning the monitors on and off often if possible
quality control setting up your qc program5
quality control Setting up your QC program
  • Control the QC environment
    • Color quality control instruments and software
      • Monitor calibrators
      • Densitometers
      • Colorimeters
quality control setting up your qc program6
quality control Setting up your QC program
  • Control the QC environment
    • Color management
quality control setting up your qc program7
quality control Setting up your QC program
  • Control the QC environment
    • Viewing conditions
      • Keep windows shaded
      • Reduce overhead lighting
      • Reduce glare on the monitors (face walls, not windows…)
      • Try to shield the viewing space for the original from the monitor
      • Inspect images against a neutral gray background (turn off your desktop patterns)
quality control setting up your qc program8
quality control Setting up your QC program
  • Control the QC environment
    • Human characteristics
      • Because each person sees color differently, it would be ideal to have one person do all the QC for a batch of images.
      • Otherwise, come up with an effective way to communicate about color
quality control setting up your qc program9
quality control Setting up your QC program
  • Evaluate system performance
    • System tests prior to conversion –
      • Resolution
      • Linearity (dynamic range)
      • Flare
      • Scanner noise
      • Artifacts
      • Color reproduction
quality control setting up your qc program10
quality control Setting up your QC program
  • Codify your inspection procedures
questions to ask
Questions to ask
  • Is the stroke adequately reproduced?
  • Is the significant detail adequately reproduced?
  • Is fine detail in the darkest and lightest portions retained?
  • Are there even gradations across the image?
  • Is the image free of moire effect?
  • Is the significant informational content adequately reproduced?
  • Is the document fully reproduced?
  • Is the image too light or too dark?
quality control assessing image quality1
quality controlAssessing Image Quality
  • Evaluate:
    • Color and tone
      • Histograms
        • Avoid clipping
      • Color and Grayscale targets
      • Measuring RGB values
slide19
Tips
  • Decide on whether you want to include the target in every image or if you want to image the target once during a scanning session
  • Choose a place in the scan range that will maximize your ability to capture data
  • Replace your targets on a regular basis
  • Sample scans of targets should be captured with your project metadata
questions grayscale
Questions … grayscale
  • Are the details in the sections of the document captured?
  • Is the image too light or too dark overall?
  • Use your grayscale bar to test:
    • How many bars can you identify?
    • Where do you cease to discern distinct shades
    • Do you see a color shift?
    • How do the RGB values compare to the reference values?
    • Are all digital levels (0 – 255) used? Is there any clipping?
questions color
Questions … color
  • Do you observe a color shift?
  • Is the image light or dark overall?
  • Compare the grayscale values as before.
  • Compare the color values to the color target.
  • Is the color satisfactory?
quality control assessing image quality2
quality controlAssessing Image Quality
  • Evaluate:
    • Overall evaluation
      • Does the image convey all of the significant information
      • How would you rate the image as compared to the original? (unacceptable, adequate but diminished, comparable, improved)
      • Will the potential user be satisfied with the image as a surrogate?
      • Is the image’s dynamic range adequate?
      • Are you satisfied with the color appearance?
aaa spanish colonial arch
AAA – Spanish Colonial Arch.

http://www.lib.utexas.edu/photodraw/missions/

blac sanchez
BLAC – Sanchez

http://www.lib.utexas.edu/photodraw/sanchez/

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