. < •*- 1- v^.x IUWI/LL V4i\l_ I 1 UHL J y JLLI1 no 
TttLL DLUL I1HI 
limò KtKKtòtiNi 
PATTERNS AND TEXTURES ON ICE. 
FOR WATER OR 
WATER OR WET 
◄ 
WHITE, NO TONE DISCRIMINATION. 
^ 
WET SNOW. 
SNOW. 
FIG 2. 
Range of Grey Tones and Colour with Broad 
Subject Categories. 
\ ERTS 
subj. \band 
category\ 
4 
500—600 nm. 
MONOCHROME 
5 
600—700 nm. 
POSITIVES 
6 
700—800 nm. 
7 
800—1100 nm. 
COLOUR 
457 
COMBINED 
PRINTS 
567 
COMBINED 
vegetated/ 
/ NON- 
/v EGETATED 
MID GREYS / 
TO DARK / MID GREYS 
GREY. / TO WHITE 
NOT DISTINGUISHABLE 
MID GREYS / 
TO WHITE. / MID GREYS 
/ TO WHITE. 
IN ANY ONE BAND 
w 
HIGH CONTRAST 
PINKS / 
TO RED /WHITE, 
/ PALE 
/ BLUES. 
MODERATE 
CONTRAST. 
BLUES / 
GREENSy/WHITE, 
/ PALE 
/ BLUE,GREEN 
WATER / 
/ LAND 
VARIABLE 
CONTRAST 
BLACK / 
/ DARK 
/ GREY TO 
' WHITE. 
VARIABLE 
CONTRAST 
BLACK / 
/ VERY 
/ DARK GREY 
' TO WHITE 
HIGH 
CONTRAST 
BLACK / 
/ MID 
/ GREYS 
' TO WHITE 
HIGH 
CONTRAST 
BLACK / 
/ MID GREY 
/ T0 
/ WHITE 
HIGH 
CONTRAST 
BLACK / 
/ REDS 
/ WHITES 
HIGH 
CONTRAST 
BLACK / 
/ BLUES 
/ GREENS 
/ WHITE 
WATER / 
/ ICE, 
/ SNOW. 
HIGH 
CONTRAST 
BLACK / 
/ WHITE 
HIGH 
CONTRAST 
BLACK / 
/ WHITE 
HIGH 
CONTRAST 
BLACK / 
/ WHITE, 
/ GREY 
/ PATTERN 
HIGH 
CONTRAST 
BLACK / 
/ WHITE, 
/ GREY 
/ PATTERN 
HIGH 
CONTRAST 
BLACK / 
/WHITE, 
/ PALE 
/ BLUE 
/ PATTERN 
HIGH 
CONTRAST 
BLACK / 
/ GOLD, 
/ GOLD- 
/ BROWN 
/ PATTERN 
WATER WITH / 
SUSPENDED / 
SEDIMENT./ 
/ICE, 
/ SNOW. 
VARIABLE 
CONTRAST 
GREYS TO / 
WHITE / 
/ WHITE 
VARIABLE 
CONTRAST 
GREYS TO / 
WHITE / 
/ WHITE 
USUALLY 
HIGH CONTRAST 
BLACK / 
/ WHITE 
/ WITH 
/ GREY 
/ PATTERN 
HIGH 
CONTRAST 
BLACK / 
/ WHITE, 
/ PALE GREY 
/ PATTERN 
MAY BE LOW CONTRAST OR NEARLY 
IDENTICAL COLOUR. 
PALE BLUE AND GOLD,RED, 
WHITE GOLDEN BROWN 
USUALLY DISTINGUISHED BY DIFFERENCE 
IN TEXTURE AND BY ANGULAR FRACTURES 
FIG 3. Separation of Subject Categories on ERTS Prints by Tone and Colour 
561