What is CMYK
CMYK is also called the printing color mode, as the name implies, it is used for printing.
Compared with RGB, there is a big difference: RGB mode is a color mode that displays light on the screen, and you can still see the content on the screen in a dark room;
CMYK is a color mode that relies on reflections for printed matter. How do we read the content of newspapers? It is the sunlight or light that shines on the newspaper and then reflects it in our eyes to see the content. It needs to have an external light source, if you are in a dark room you cannot read the newspaper.
As long as the image displayed on the screen is represented by the RGB mode. As long as the image seen on the printed matter is expressed in CMYK mode. For example, periodicals, magazines, newspapers, posters, etc. are all printed, so it is in CMYK mode.
Selected color spectrum for CMYK printing
| Number | C | M | Y | K | R | G | B | HEX |
| 1 | 0 | 100 | 100 | 45 | 139 | 0 | 22 | 8B0016 |
| 2 | 0 | 100 | 100 | 25 | 178 | 0 | 31 | B2001F |
| 3 | 0 | 100 | 100 | 15 | 197 | 0 | 35 | C50023 |
| 4 | 0 | 100 | 100 | 0 | 223 | 0 | 41 | DF0029 |
| 5 | 0 | 85 | 70 | 0 | 229 | 70 | 70 | E54646 |
| 6 | 0 | 65 | 50 | 0 | 238 | 124 | 107 | EE7C6B |
| 7 | 0 | 45 | 30 | 0 | 245 | 168 | 154 | F5A89A |
| 8 | 0 | 20 | 10 | 0 | 252 | 218 | 213 | FCDAD5 |
| 9 | 0 | 90 | 80 | 45 | 142 | 30 | 32 | 8E1E20 |
| 10 | 0 | 90 | 80 | 25 | 182 | 41 | 43 | B6292B |
| 11 | 0 | 90 | 80 | 15 | 200 | 46 | 49 | C82E31 |
| 12 | 0 | 90 | 80 | 0 | 223 | 53 | 57 | E33539 |
| 13 | 0 | 70 | 65 | 0 | 235 | 113 | 83 | EB7153 |
| 14 | 0 | 55 | 50 | 0 | 241 | 147 | 115 | F19373 |
| 15 | 0 | 40 | 35 | 0 | 246 | 178 | 151 | F6B297 |
| 16 | 0 | 20 | 20 | 0 | 252 | 217 | 196 | FCD9C4 |
| 17 | 0 | 60 | 100 | 45 | 148 | 83 | 5 | 945305 |
| 18 | 0 | 60 | 100 | 25 | 189 | 107 | 9 | BD6B09 |
| 19 | 0 | 60 | 100 | 15 | 208 | 119 | 11 | D0770B |
| 20 | 0 | 60 | 100 | 0 | 236 | 135 | 14 | EC870E |
| 21 | 0 | 50 | 80 | 0 | 240 | 156 | 66 | F09C42 |
| 22 | 0 | 40 | 60 | 0 | 245 | 177 | 109 | F5B16D |
| 23 | 0 | 25 | 40 | 0 | 250 | 206 | 156 | FACE9C |
| 24 | 0 | 15 | 20 | 0 | 253 | 226 | 202 | FDE2CA |
| 25 | 0 | 40 | 100 | 45 | 151 | 109 | 0 | 976D00 |
| 26 | 0 | 40 | 100 | 25 | 193 | 140 | 0 | C18C00 |
| 27 | 0 | 40 | 100 | 15 | 213 | 155 | 0 | D59B00 |
| 28 | 0 | 40 | 100 | 0 | 241 | 175 | 0 | F1AF00 |
| 29 | 0 | 30 | 80 | 0 | 243 | 194 | 70 | F3C246 |
| 30 | 0 | 25 | 60 | 0 | 249 | 204 | 118 | F9CC76 |
| 31 | 0 | 15 | 40 | 0 | 252 | 224 | 166 | FCE0A6 |
| 32 | 0 | 10 | 20 | 0 | 254 | 235 | 208 | FEEBD0 |
| 33 | 0 | 0 | 100 | 45 | 156 | 153 | 0 | 9C9900 |
| 34 | 0 | 0 | 100 | 25 | 199 | 195 | 0 | C7C300 |
| 35 | 0 | 0 | 100 | 15 | 220 | 216 | 0 | DCD800 |
| 36 | 0 | 0 | 100 | 0 | 249 | 244 | 0 | F9F400 |
| 37 | 0 | 0 | 80 | 0 | 252 | 245 | 76 | FCF54C |
| 38 | 0 | 0 | 60 | 0 | 254 | 248 | 134 | FEF889 |
| 39 | 0 | 0 | 40 | 0 | 255 | 250 | 179 | FFFAB3 |
| 40 | 0 | 0 | 25 | 0 | 255 | 251 | 209 | FFFBD1 |
| 41 | 60 | 0 | 100 | 45 | 54 | 117 | 23 | 367517 |
| 42 | 60 | 0 | 100 | 25 | 72 | 150 | 32 | 489620 |
| 43 | 60 | 0 | 100 | 15 | 80 | 166 | 37 | 50A625 |
| 44 | 60 | 0 | 100 | 0 | 91 | 189 | 43 | 5BBD2B |
| 45 | 50 | 0 | 80 | 0 | 131 | 199 | 93 | 83C75D |
| 46 | 35 | 0 | 60 | 0 | 175 | 215 | 136 | AFD788 |
| 47 | 25 | 0 | 40 | 0 | 200 | 226 | 177 | C8E2B1 |
| 48 | 12 | 0 | 20 | 0 | 230 | 241 | 216 | E6F1D8 |
| 49 | 100 | 0 | 90 | 45 | 0 | 98 | 65 | 006241 |
| 50 | 100 | 0 | 90 | 25 | 0 | 127 | 84 | 007F54 |
| 51 | 100 | 0 | 90 | 15 | 0 | 140 | 94 | 008C5E |
| 52 | 100 | 0 | 90 | 0 | 0 | 160 | 107 | 00A06B |
| 53 | 80 | 0 | 75 | 0 | 0 | 174 | 114 | 00AE72 |
| 54 | 60 | 0 | 55 | 0 | 103 | 191 | 127 | 67BF7F |
| 55 | 45 | 0 | 35 | 0 | 152 | 208 | 185 | 98D0B9 |
| 56 | 25 | 0 | 20 | 0 | 201 | 228 | 214 | C9E4D6 |
| 57 | 100 | 0 | 40 | 45 | 0 | 103 | 107 | 00676B |
| 58 | 100 | 0 | 40 | 25 | 0 | 132 | 137 | 008489 |
| 59 | 100 | 0 | 40 | 15 | 0 | 146 | 152 | 009298 |
| 60 | 100 | 0 | 40 | 0 | 0 | 166 | 173 | 00A6AD |
| 61 | 80 | 0 | 30 | 0 | 0 | 178 | 191 | 00B2BF |
| 62 | 60 | 0 | 25 | 0 | 110 | 195 | 201 | 6EC3C9 |
| 63 | 45 | 0 | 20 | 0 | 153 | 209 | 211 | 99D1D3 |
| 64 | 25 | 0 | 10 | 0 | 202 | 229 | 232 | CAE5E8 |
| 65 | 100 | 60 | 0 | 45 | 16 | 54 | 103 | 103667 |
| 66 | 100 | 60 | 0 | 25 | 24 | 71 | 133 | 184785 |
| 67 | 100 | 60 | 0 | 15 | 27 | 79 | 147 | 1B4F93 |
| 68 | 100 | 60 | 0 | 0 | 32 | 90 | 167 | 205AA7 |
| 69 | 85 | 50 | 0 | 0 | 66 | 110 | 180 | 426EB4 |
| 70 | 65 | 40 | 0 | 0 | 115 | 136 | 193 | 7388C1 |
| 71 | 50 | 25 | 0 | 0 | 148 | 170 | 214 | 94AAD6 |
| 72 | 30 | 15 | 0 | 0 | 191 | 202 | 230 | BFCAE6 |
| 73 | 100 | 90 | 0 | 45 | 33 | 21 | 81 | 211551 |
| 74 | 100 | 90 | 0 | 25 | 45 | 30 | 105 | 2D1E69 |
| 75 | 100 | 90 | 0 | 15 | 50 | 34 | 117 | 322275 |
| 76 | 100 | 90 | 0 | 0 | 58 | 40 | 133 | 3A2885 |
| 77 | 85 | 80 | 0 | 0 | 81 | 31 | 144 | 511F90 |
| 78 | 75 | 65 | 0 | 0 | 99 | 91 | 162 | 635BA2 |
| 79 | 60 | 55 | 0 | 0 | 130 | 115 | 176 | 8273B0 |
| 80 | 45 | 40 | 0 | 0 | 160 | 149 | 196 | A095C4 |
| 81 | 80 | 100 | 0 | 45 | 56 | 4 | 75 | 38044B |
| 82 | 80 | 100 | 0 | 25 | 73 | 7 | 97 | 490761 |
| 83 | 80 | 100 | 0 | 15 | 82 | 9 | 108 | 52096C |
| 84 | 80 | 100 | 0 | 0 | 93 | 12 | 123 | 5D0C7B |
| 85 | 65 | 85 | 0 | 0 | 121 | 55 | 139 | 79378B |
| 86 | 55 | 65 | 0 | 0 | 140 | 99 | 164 | 8C63A4 |
| 87 | 40 | 50 | 0 | 0 | 170 | 135 | 184 | AA87B8 |
| 88 | 25 | 30 | 0 | 0 | 201 | 181 | 212 | C9B5D4 |
| 89 | 40 | 100 | 0 | 45 | 100 | 0 | 75 | 64004B |
| 90 | 40 | 100 | 0 | 25 | 120 | 0 | 98 | 780062 |
| 91 | 40 | 100 | 0 | 15 | 143 | 0 | 109 | 8F006D |
| 92 | 40 | 100 | 0 | 0 | 162 | 0 | 124 | A2007C |
| 93 | 35 | 80 | 0 | 0 | 143 | 0 | 109 | AF4A92 |
| 94 | 25 | 60 | 0 | 0 | 197 | 124 | 172 | C57CAC |
| 95 | 20 | 40 | 0 | 0 | 210 | 166 | 199 | D2A6C7 |
| 96 | 10 | 20 | 0 | 0 | 232 | 211 | 227 | E8D3E3 |
| 97 | 0 | 0 | 0 | 10 | 236 | 236 | 236 | ECECEC |
| 98 | 0 | 0 | 0 | 20 | 215 | 215 | 215 | D7D7D7 |
| 99 | 0 | 0 | 0 | 30 | 194 | 194 | 194 | C2C2C2 |
| 100 | 0 | 0 | 0 | 35 | 183 | 183 | 183 | B7B7B7 |
| 101 | 0 | 0 | 0 | 45 | 160 | 160 | 160 | A0A0A0 |
| 102 | 0 | 0 | 0 | 55 | 137 | 137 | 137 | 898989 |
| 103 | 0 | 0 | 0 | 65 | 112 | 112 | 112 | 707070 |
| 104 | 0 | 0 | 0 | 75 | 85 | 85 | 85 | 555555 |
| 105 | 0 | 0 | 0 | 85 | 54 | 54 | 54 | 363636 |
| 106 | 0 | 0 | 0 | 100 | 0 | 0 | 0 | 000000 |
