The addition of The Petra Project section to eclipse posed another series of technical challenges. The information in Petra Project proved to be the most image focused work yet in the project and required close attention be payed to the quality of images produced for the site. However, bandwidth and resolution concerns often times forced us to make sacrifices in quality. The images were archived and then derived as follows:

Scanner: Used for manuscripts, correspondence, newspaper clippings (black & white) and for the actual book, and a poster
Resolution done at 600 dpi (32-bit color)
For manuscripts etc. output type: Black & White bitmap - Black & White threshold was set at 160
For the Book and the One Poster all the archival files are saved as uncompressed TIFF files.

For the web all the text files (manuscripts, correspondence, newspaper clipping, & the poster) were saved as JPEG files with an image size of 800 pixels across.
For the actual book the files were saved as JPEG files in 3 different sizes:

• Large size 750 pixels across with the Quality set at 100%
• Medium size 300 pixels across with the Quality set at 60%
• Small size 125 pixels across with the Quality set at 30%

Original Artwork

Photographed: ISO = 80 with the Aperture Priority set to 8.0
All the artwork was photographed and saved as uncompressed TIFF files.
For the artwork the files were saved as JPEG files in 3 different size:

• Large size 750 pixels across with the Quality set at 100%
• Medium size 300 pixels across with the Quality set at 60%
• Small size 125 pixels across with the Quality set at 30%

Another question related to the Petra Project, was how to most effectively represent the book's wide format pages as images without stretching the page to far to the side. The original manuscripts were written on standard letter sized pages and lent very well to a full page display with vertical scrolling only at 800 pixels wide. The pages of the book itself were not as easy of a task. The book has an elongated aspect ratio much different than the 4:3 ratio common on most computer monitors today. So, showing a single page at a medium resolution fit on the screen without pushing too far off the side (some side scrolling was accepted as necessary), but the site's researchers thought it important to display pages side by side as they are when reading book. This would make a single frame of reference more than 1600 pixels wide, far wider than even many of the larger screen sizes used today. While the details would be visible to the user, the amount of image off screen at any one time would not allow the 2 pages to be seen in perspective to one another, defeating the purpose of showing them side by side to begin with. Instead a smaller resolution was used to show the effect of the book as it would be seen in person, and each page is clickable to open a larger version.