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Digitization

The materials in the John and Selma Appel collection represent a variety of media--political cartoons, postcards, sheet music covers, trade cards and stereo photographs. The digital images in this online collection have been produced through a variety of means.

Slides were scanned at an optical resolution of 1350 dpi using the Nikon LS-2000 Film Scanner.  Small format media was scanned using a flat bed scanner.  Large format media was photographed on a copy stand using a digital SLR. The captured images were then processed to create a set of three images for each item: a high-resolution archival copy, a good-quality reference copy (as seen in the exhibit), and a small, low resolution thumbnail copy.

The following technical standards apply to the digital images in the collection:

Archival Images: Spatial resolution of approximately 1800 pixels on the long side of the image, with the short side falling where it may. Pixel depth of 24 bits/pixel. Tagged Image File Format (TIFF), with no compression, sharpening, or other processing other than color correction.

Reference Images: Spatial resolution of approximately 640 pixels on the long side of the image, with the short side falling where it may. Pixel depth of 24 bits/pixel (color images) or 8 bits/pixel (greyscale). Images are compressed at an average ratio of 10:1 in the JPEG format. Reference images have been digitally "sharpened" to compensate for the loss of resolution required for a web-based presentation.

Thumbnail Images: Spatial resolution of approximately 150 pixels on the long side of the image, with the short side falling where it may. Pixel depth of 8 bits/pixel with an adaptive color palette. GIF-native compression is used, and images are sharpened to improve appearance.



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