Explanation for CMYK Color Chart

34—EXPLANATION FOR CMYK COLOR CHART (PLATE A)
DISCUSSION
The CMYK Color Chart (Plate A) was designed to reproduce the colors shown on the U.S. Geological Survey's offset-printed process-ink color chart,
"Printing Colors and Screens in Use by the U.S. Geological Survey for Geologic and Hydrologic Maps" (yellow/magenta/cyan version), which has long
been used at the USGS for choosing unit colors on geologic maps. Plate A nearly exactly reproduces the offset-printed USGS color chart, except that
the original color codes indicating the YMC (yellow/magenta/cyan) values have been converted to CMYK (cyan/magenta/yellow, with K = 0) to conform
to industry standards.
For general information on the use of color and patterns on geologic maps, see Section 5 entitled "Guidelines for Color Design" in the accompanying
introductory text.
8% CYAN WITH MAGENTA AND YELLOW
CMYK values (K = 0): A = 8%, 1 = 13%, 2 = 20%, 3 = 30%, 4 = 40%, 5 = 50%, 6 = 60%, 7 = 70%, X = 100%
A00
AA0 A10 A20 A30 A40 A50 A60 A70 AX0
A0A AAA A1A
A2A
A3A A4A
A5A
A6A
A7A
AXA
A01 AA1 A11
A21
A31 A41
A51
A61
A71
AX1
A02 AA2 A12
A22
A32 A42
A52
A62
A72
AX2
A03 AA3 A13
A23
A33 A43
A53
A63
A73
AX3
A04 AA4 A14 A24 A34 A44 A54 A64 A74 AX4
A05
AA5
A15
A25
A35 A45
A55
A65
A75
AX5
A06 AA6 A16 A26 A36 A46 A56 A66 A76 AX6
A07 AA7 A17
A27
A37 A47
A57
A67
A77
AX7
A0X AAX A1X A2X A3X A4X A5X A6X A7X AXX
100
110
120
130
140
150
160
170
180
190
101
111
121
131
141
151
161
171
181
191
102
112
122
132
142
152
162
172
182
192
103
113
123
133
143
153
163
173
183
193
104
114
124
134
144
154
164
174
184
194
105
115
125
135
145
155
165
175
185
195
106
116
126
136
146
156
166
176
186
196
107
117
127
137
147
157
167
177
187
197
108
118
128
138
148
158
168
178
188
198
109
119
129
139
149
159
169
179
189
199
Generic lookup-table
number shown in upper
left-hand corner of box
(can be used to access
a particular color from
a shadeset)
CMY value shown below box;
see below for explanation of
abbreviations used (shown
along far left side of boxes)
Abbreviations used to
specify CMY values
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