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Guidelines for Digital Images

The Maryland Historical Trust, the State Historic Preservation Office (SHPO), will accept digital images for Determination of Eligibility (DOE) forms and other submissions to the Maryland Inventory of Historic Properties (MIHP). Traditional black-and-white photographs are still the preferred format of the MIHP. Traditional black-and-white photographs are processed using chemistry designed exclusively for black-and-white images and do not include negatives processed with C-41 color chemistry or prints on chromogenic papers. The DOE “short” forms that are required for certain ineligible properties are not added to the MIHP and do not require archival photographs. Regular DOE forms are permanently added to the MIHP, and if they are supported by digital images instead of traditional black-and-white photographs, must include archival prints, digital image files, and a photo log that meet the requirements below. These SHPO requirements vary slightly from those of the National Register of Historic Places in the labeling and packaging of prints, the size and naming convention for digital files, and the requirement for additional information in the photo log.

All original images, including digital photographs, in the MIHP are intended to be available to the public for unrestricted use and reproduction, provided appropriate credit is given to editors, creators, and photographers. It is the responsibility of the preparers of DOE forms and other MIHP documentation to secure any necessary permission for unrestricted use and reproduction of digital photographs submitted to the MIHP. DOE forms accompanied by digital photographs without these permissions are not acceptable.

Prints 

Prints must be 5” X 7” and printed in black-and-white using the full color spectrum of an ink and paper combination demonstrated to last seventy-five years or longer before showing significant signs of fading, deterioration, or discoloration.  A non-comprehensive list of ink and paper combinations that have been demonstrated to meet this seventy-five year permanence standard may be found below.  All prints must be produced from digital image files meeting the requirements described below.  All printed digital photos must be packaged in side-loading polypropylene pages and labeled on the back with soft pencil.  In addition to the label information described on pages 36-7 of The Standards and Guidelines for Architectural and Historical Investigations in Maryland, printed digital photos should be labeled with the name of the corresponding digital image file.

Digital Image Files

All prints must be accompanied by a corresponding digital image file.  Digital image files must be in an uncompressed TIF format, named in accordance with Appendix B, and saved on an archival CD-R Gold or DVD-R Gold.  Digital images files must: 

  • be original capture .tif or .tiff (Tagged Image File format) files or raw files converted to .tiff;
  • be named in accordance with File Requirements below;
  • have a pixel array of at least 3000 x 2000;
  • have a resolution of 300 ppi (pixels per inch) or larger;
  • be saved in RGB color mode; and be submitted on a closed and finalized CD-R Gold or DVD-R Gold labeled in permanent archival ink (not a Sharpie) with the MIHP number and date.

Photo Log

A photo log in Microsoft Word format must be included with the DOE form and saved on the archival CD-R Gold or DVD-R Gold.  Each log should include the exact image file name and a description of the view.  The log must also note the ink and paper combination used to create the prints and the brand, make, and dye type of the CD-R Gold or DVD-R Gold.

Ink and Paper Combinations

The SHPO does not endorse any particular commercial product or process, but follows the recommendation for permanence established by the National Register of Historic Places.  The non-comprehensive list below consists of ink and paper combinations demonstrated to meet the seventy-five year permanence standard.  Since the longevity of a print is dependent on the ink and paper combination used to produce it, specific printers are not identified.  More information on the archival properties of inks and digital papers can be found at:  http://www.nps.gov/history/nr/publications/bulletins/photopolicy/index.htm and
http://www.wilhelm-research.com.
 
Epson UltraChrome pigmented inks:

  • Epson Premium Glossy Paper
  • Epson Premium Semigloss Photo Paper
  • Epson Premium Luster Photo Paper
  • Epson Premium Semimatte Photo Paper
  • Epson UntraSmoooth Fine Art
  • PaperSomerset Velvet for Epson
  • Epson Velvet Fine Art Paper
  • Epson Textured Fine Art Paper
  • Epson Enhanced Matte Paper

Epson Picture Mate Inks:

  • Epson Picture Mate Photo Papers

Hewlett-Packard (HP) 84/85 dye-based inkset:

  • HP Premium Plus Photo and Proofing Gloss
  • HP Premium Plus High Gloss Photo Paper
  • HP Premium Plus Soft Gloss Photo Paper
  • HP Premium Photo Paper, Gloss
  • HP Premium Photo Paper, Soft Gloss

HP 59 gray photo cartridge:

  • HP Premium Plus and HP Premium Photo Papers (high gloss, glossy, and soft gloss)

HP 100 gray photo cartridge:

  • HP Premium Plus and HP Premium Photo Papers (high gloss, glossy, and soft gloss)

HP Vivera inks (95 and 97 tri-color cartridges):

  • HP Premium Plus and HP Premium Photo Papers (high gloss, glossy, and soft gloss)

File Requirements

The file naming system for digital image files is based on the Maryland Inventory of Historic Properties (MIHP) number.  The MIHP numbering convention is generally consistent throughout the state, but slight variations by county do exist and therefore the digital naming system will also have slight variations by location.  The basic naming structure for digital image files consists of three elements separated by underscores: 1.  the MIHP number (county code-four digit number); 2.  the eight digit numerical date of creation (yyyy-mm-dd); and 3.  a two digit photo number.  Thus, digital image files of the Maryland State House (MIHP number AA-685) taken on June 3 2007 would be named AA-0685_2007-06-03_01.tif; AA-0685_2007-06-03_02, etc. 

County variations are as follows:

  • Allegany County:  Allegany County MIHP numbers contain district numbers (I-VII) and letters.  Digital images for MIHP number AL-V-A-47 and shot on June 7, 2007 would be labeled:
    AL-V-A-0047_2007-07-03_01.tif, AL-V-A-0047_2007-07-03_02.tif, etc.
  • Frederick County:  Frederick County MIHP numbers contain district numbers (1-8).  Digital images for MIHP number F-7-326 and shot on November 3, 2007 would be labeled:
    F-7-0326_2007-11-03_01.tif, F-7-0326_2007-11-03_02.tif etc.
  • Frederick Historic District MIHP numbers use the code FHD followed by a four digit number: FHD-1234_2007-11-03_01.tif, etc.
  • Garrett County:  Garrett County MIHP numbers contain district numbers (I-VI) and letters.  Digital images for MIHP number G-V-A-261 and shot on March 13, 2007 would be labeled:
    G-V-A-0261_2007-03-13_01.tif, G-V-A-0261_2007-03-13_02.tif, etc.
  • Montgomery County: Montgomery County MIHP numbers include a colon after the county code, followed by a space and a regional number (1-37), follow by a dash and a site number.  In digital file names, the colon is replaced by a semi-colon and the space remains.  Digital images for MIHP number M: 37-44 and shot on August 5, 2007 would be labeled: 
    M; 33-44_2007-08-05_01.tif, M; 37-44_2007-08-05_02.tif, etc.

    Some Montgomery County MIHP numbers have site sub-numbers: M: 37-44-01.  These sub-number are indicated after a dash: M; 37-44-01_2007-08-05_01.tif
  • Prince George’s County: Prince George’s County MIHP numbers include a colon after the county code followed by a regional number (61-87), a dash and a site number.  In digital file names, the colon is replaced by a semi-colon. Digital images for MIHP number PG:60-25 and shot on January 20, 2007 would be labeled: 
    PG;60-25_2007-01-20_01.tif, PG;60-25_2007-01-20_02.tif, etc.
  • Laurel Historic District MIHP numbers use the code LAU- in between the semi-colon and the site number (there are no district numbers): PG;LAU-12_2007-01-20_01.tif, etc.
  • Washington County: Washington County MIHP numbers contain district numbers (I-IV).  Digital images for MIHP number WA-II-313 and shot on October 31, 2007 would be labeled:
    WA-II-0313_2007-10-31_01.tif, WA-II-0313_2007-10-31_02.tif etc.

    Resources in town historic districts in Washington County insert a town code (with dashes) between the county code and site number: Hagerstown: WA-HAG-001_2007-01-01_01.tif, etc; Hancock: WA-HAN-001_2007-01-01_01.tif, etc.; Williamsport: WA-WIL-001_2007-01-01_01.tif, etc.