Printed Text

Pictorial Materials

Oversized Materials

Manuscripts

Library of Congress

400-500 pixels horizontal, 4-bit gray, 8-bit color, GIF

thumbnail: 200x200, 8-bit, GIF

reference: 640 x 480, 8-bit gray, 24-bit color, JPEG, 10:1 gray, 20:1 color

[Map service image]
300 dpi, 24-bit, MrSID wavelet format  (Viewer available from LizardTech)

See printed text

NARA

access: 90 dpi, 4-bit gray, 8-bit color, GIF

thumbnails: 200 pixels—long dimension, 72 dpi, 4-bit for gray, 8-bit, custom palette for color, GIF

[Photographs]
access:  600 pixels—long dimension; 540—square images; 72 dpi, 4-bit gray, 8-bit color, GIF

thumbnails: 200 pixels—long dimension, 72 dpi, 4-bit gray or 8-bit color, GIF

[Textual]
access: 90 dpi, 8-bit gray; 24-bit color, JPEG low quality compression

Columbia

120-200 dpi, 4-bit, GIF

Multiple resolution, 24-bit, JPEG Quality Level 50

[Large format transparency]
Multiple 24-bit, JPEG, Quality Level 50

See pictorial materials

Colorado Digitization Project

access: Scale to fit monitors or from 1000-5000 pixels (long dimension) for higher-resolution version, 8-bit gray/24-bit color, JPEG (avg. 20:1 compression)

thumbnail: 150-200 pixels (+/-) across the long dimension, 72 dpi, 4-bit gray/8-bit color, GIF,

access: Scale to fit monitors and/or quality needs, 8-bit gray/24-bit color, JPEG (compr. factor 7:1-10:1 gray/10:1, 20:1 color)

thumbnail: resize to 150-200 pixels (+/-) across the long dimension, 72 dpi, 4-bit gray/8-bit color, GIF (or JPEG),

access: 1200 pixels—long dimension or from 1000-5000 pixels for higher-resolution version, 8-bit gray/24-bit color, JPEG (avg. compr. factor 20:1)

thumbnail: 4-bit gray/8-bit color, GIF or JPEG, resize to 150-200 pixels (+/-) across the long dimension, 72 dpi

California Digital Library

600 or 1200 pixels on long dimension, 8-bit gray, GIF or JPEG

300, 800, 1500 and/or 3000 pixels on long dimension, 24-bit color, JPEG/JFIF medium quality

see pictorial materials

See pictorial materials