Provide Access to Spectral RTI Images

The SpectralRTI_Toolkit has options to create three types of output (in addition to intermediate files that facilitate changing some settings without redoing the entire process). Each type of output has its own advantages and disadvantages.

Contents

  1. What is Spectral RTI and do I need it? (LINK)
    1. Cost/benefit of adding RTI (LINK)
    2. Cost/benefit of adding spectral (LINK)
    3. How does the integration work? (LINK)
  2. Capture hardware (LINK)
    1. Spectral imaging hardware (LINK)
    2. Fixed dome for RTI capture (LINK)
    3. Swinging arc for RTI capture (LINK)
    4. Hand-held flash for RTI capture (LINK)
  3. Capture procedures (LINK)
    1. Light position capture and calibration (LINK)
    2. Hemisphere captures for RTI (LINK)
    3. Preprocessing typically done at capture (LINK)
  4. Processing with the SpectralRTI_Toolkit (LINK)
    1. Software installation (LINK)
    2. Managing input data (LINK)
    3. Running for the first time (LINK)
    4. Select tasks (LINK)
    5. Adjust brightness (LINK)
    6. Static raking option (LINK)
    7. Options for Extended Spectrum (LINK)
    8. Identify region of interest (for Extended Spectrum and Pseudocolor) (LINK)
    9. Options for PCA Pseudocolor (LINK)
    10. Options for custom processes (LINK)
    11. Light position data (LINK)
    12. Additional prompts (LINK)
    13. Tips for frequent use (LINK)
  5. Make the images accessible to users
    1. RTI files (LINK)
    2. WebRTI (LINK)
    3. Tiled and layered Jpeg2000 files for IIIF (LINK)
  6. Help make Spectral RTI better (LINK)
  7. Glossary (LINK)

RTI files

The Toolkit creates folders in the project directory that end in "RTI" (e.g., AccurateColorRTI). One RTI file (and 56 or so intermediate jpeg files) can be found in the folder for each color process (Accurate Color, Extended Spectrum, PCA Pseudocolor, Custom). The files can be distributed through external drives or the Internet, but they are large and require a specialized viewer to open, such as RTIViewer (http://culturalheritageimaging.org/What_We_Offer/Downloads/View/) or InscriptiFact Standalone Viewer (http://ruth.usc.edu/ISFStandaloneViewer/).

Advantages

Disadvantages

WebRTI

If WebRTI is selected from "Select Tasks" the folders ending in RTI contain an html file and sub-folder containing many small images files. For example: AccurateColorRTI/Ambrosiana_H190inf_036v_AccurateColorRTI_20170710_0816_wrti.html and AccurateColorRTI/Ambrosiana_H190inf_036v_AccurateColorRTI_20170710_0816. These files can be copied to a webserver, along with the JavaScript and stylesheets for WebRTI (http://vcg.isti.cnr.it/rti/webviewer.php), and viewed in any web browser.

Advantages

Disadvantages

Tiled and layered Jpeg2000 images for IIIF repositories

If Static Raking is selected from "Select Tasks" a folder named "StaticRaking" will be created in the project directory. The folder contains jpeg2000 (jp2) files for diffuse lighting (numbered 00) and for each light position selected. The color processes are abbreviated Ac for Accurate Color, Xs for Extended Spectrum, Ps for PCA Pseudocolor, and custom processes are unabbreviated. Once you have a IIIF Image server, it is a simple matter to copy the jp2 files to the appropriate directory.

Advantages

Disadvantages