Classic image-processing images
=============================================================================================
These are the classic images that have been used for years in signal processing.
They are provided courtesy of the Signal and Image Processing Institute at the
University of Southern California. The copyright status of these images in unclear.

image           dimensions
----------------------------
baboon.png      298-by-298
f16.png         512-by-512
fishingboat.png 512-by-512
peppers.png     512-by-512
pentagon.png    1024-by-1024


Other images
=============================================================================================
sunflowers.png (150-by-92)
Sunflowers in Fargo, North Dakota.
Photo by Bruce Fritz, Agricultural Research Service, USDA.
Copyright: public domain
https://www.ars.usda.gov/oc/images/photos/jan95/k5751-1/

penguins.png (301-by-201)
Adelie penguins on Torgerson Island, near the Antarctic
Photo by Peter Rejcek, National Science Foundation
Copyright: United States Antarctic Photo Library Usage Agreement
https://photolibrary.usap.gov

earth.png (320-by-320)
A Sky View of Earth From Suomi NPP
The image was created by the Ocean Biology Processing Group at NASA's Goddard Space Flight Center in Greenbelt, Maryland.
Copyright: public domain
This composite image of southern Africa and the surrounding oceans was captured by six orbits of the NASA/NOAA Suomi National Polar-orbiting Partnership spacecraft on April 9, 2015, by the Visible Infrared Imaging Radiometer Suite (VIIRS) instrument. 
https://images.nasa.gov/details-a-sky-view-of-earth-from-suomi-npp_16611703184_o.html

shield.png (695-by-860)
Princeton University shield
Copyright: The Trustees of Princeton University
https://communications.princeton.edu/guides-tools/logo-graphic-identity

6-by-5.png (6-by-5)
sample grayscale values used in assignment specification

pipe.png