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we have used them to identify names on vessels, details of rigging and hardware placement, and occasionally the expression of folks on deck. The scanned images in the collection come in several versions, with varying levels of image compression. File Type

File Size

Size in Pixels

Resolution (dpi)

JPEG

55kb

640 x 505

72

JPEG

149kb

1024 x 808

72

TIFF

19mb

5106 x 4027

490

TIFF

156mb

10194 x 8114

980

File size and size in pixels for individual photographs varies, but only slightly. Your selection of which file to download depends upon the purpose for which you wish to put the image in question. The most detailed information is clearly in the largest TIFF image, but some of these are massive files (larger than 150MB) and the trade-off is a longer downloading time and the space it takes up on your computer. For

“The photographer’s assistants,” ca. 1873, from the William Henry Jackson photographs in the Detroit Publishing Co. Collection, Library of Congress. The number of digitized photochrom images is a very small percentage of the total in the DPC collection—less than one percent. “The Captain Visger in Lost Channel, Thousand Islands,” (below) was taken around 1901. Captain Visger was built as a yacht in 1895 for W. L. Visger, who ran boat tours throughout the Thousand Islands.

SEA HISTORY 172, AUTUMN 2020 23

Sea History 172 - Autumn 2020  

Pg. 10 NMHS Annual Awards Dinner—A Virtual Celebration! • Pg. 16 Freedom and Whaling on Nantucket, by Skip Finley • Pg. 22 Discovering Sea H...

Sea History 172 - Autumn 2020  

Pg. 10 NMHS Annual Awards Dinner—A Virtual Celebration! • Pg. 16 Freedom and Whaling on Nantucket, by Skip Finley • Pg. 22 Discovering Sea H...

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