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Image

Dimensions (pixels)

Source

1

airplane

Public Domain

2

baboon

Public Domain

3

barbara

Public Domain

4

boat

Public Domain

5

boy

Public Domain

6

cameraman

Public Domain

7

chessboard

Collected Separately

8

fruits

Public Domain

9

girl

Public Domain

10

goldhill

Public Domain

11

lena

Public Domain

12

line

Generated by the Authors

13

monarch

Public Domain

14

mountain

Public Domain

15

peppers

Public Domain

16

sails

Public Domain

17

strawberry

Collected Separately

18

tulips

Public Domain

19

watch

Public Domain

20

zelda

Public Domain