matplotlib：
matplotlibz中直接以字符形式表示颜色，直接颜色参数那里设置。比如c='black'就表示设置为黑色。所有颜色字符如下：
cv2：
cv2里可以设置RGB三维的颜色值，比如c=（0， 0， 255）表示为红色，即设置了红色的RGB三个值。其他RGB值如下：
0 wall [120 120 120]
1 building [180 120 120]
2 sky [ 6 230 230]
3 floor [80 50 50]
4 tree [ 4 200 3]
5 ceiling [120 120 80]
6 road [140 140 140]
7 bed [204 5 255]
8 windowpane [230 230 230]
9 grass [ 4 250 7]
10 cabinet [224 5 255]
11 sidewalk [235 255 7]
12 person [150 5 61]
13 earth [120 120 70]
14 door [ 8 255 51]
15 table [255 6 82]
16 mountain [143 255 140]
17 plant [204 255 4]
18 curtain [255 51 7]
19 chair [204 70 3]
20 car [ 0 102 200]
21 water [ 61 230 250]
22 painting [255 6 51]
23 sofa [ 11 102 255]
24 shelf [255 7 71]
25 house [255 9 224]
26 sea [ 9 7 230]
27 mirror [220 220 220]
28 rug [255 9 92]
29 field [112 9 255]
30 armchair [ 8 255 214]
31 seat [ 7 255 224]
32 fence [255 184 6]
33 desk [ 10 255 71]
34 rock [255 41 10]
35 wardrobe [ 7 255 255]
36 lamp [224 255 8]
37 bathtub [102 8 255]
38 railing [255 61 6]
39 cushion [255 194 7]
40 base [255 122 8]
41 box [ 0 255 20]
42 column [255 8 41]
43 signboard [255 5 153]
44 chest of drawers [ 6 51 255]
45 counter [235 12 255]
46 sand [160 150 20]
47 sink [ 0 163 255]
48 skyscraper [140 140 140]
49 fireplace [250 10 15]
50 refrigerator [ 20 255 0]
51 grandstand [ 31 255 0]
52 path [255 31 0]
53 stairs [255 224 0]
54 runway [153 255 0]
55 case [ 0 0 255]
56 pool table [255 71 0]
57 pillow [ 0 235 255]
58 screen door [ 0 173 255]
59 stairway [ 31 0 255]
60 river [ 11 200 200]
61 bridge [255 82 0]
62 bookcase [ 0 255 245]
63 blind [ 0 61 255]
64 coffee table [ 0 255 112]
65 toilet [ 0 255 133]
66 flower [255 0 0]
67 book [255 163 0]
68 hill [255 102 0]
69 bench [194 255 0]
70 countertop [ 0 143 255]
71 stove [ 51 255 0]
72 palm [ 0 82 255]
73 kitchen island [ 0 255 41]
74 computer [ 0 255 173]
75 swivel chair [ 10 0 255]
76 boat [173 255 0]
77 bar [ 0 255 153]
78 arcade machine [255 92 0]
79 hovel [255 0 255]
80 bus [255 0 245]
81 towel [255 0 102]
82 light [255 173 0]
83 truck [255 0 20]
84 tower [255 184 184]
85 chandelier [ 0 31 255]
86 awning [ 0 255 61]
87 streetlight [ 0 71 255]
88 booth [255 0 204]
89 television receiver [ 0 255 194]
90 airplane [ 0 255 82]
91 dirt track [ 0 10 255]
92 apparel [ 0 112 255]
93 pole [ 51 0 255]
94 land [ 0 194 255]
95 bannister [ 0 122 255]
96 escalator [ 0 255 163]
97 ottoman [255 153 0]
98 bottle [ 0 255 10]
99 buffet [255 112 0]
100 poster [143 255 0]
101 stage [ 82 0 255]
102 van [163 255 0]
103 ship [255 235 0]
104 fountain [ 8 184 170]
105 conveyer belt [133 0 255]
106 canopy [ 0 255 92]
107 washer [184 0 255]
108 plaything [255 0 31]
109 swimming pool [ 0 184 255]
110 stool [ 0 214 255]
111 barrel [255 0 112]
112 basket [ 92 255 0]
113 waterfall [ 0 224 255]
114 tent [112 224 255]
115 bag [ 70 184 160]
116 minibike [163 0 255]
117 cradle [153 0 255]
118 oven [ 71 255 0]
119 ball [255 0 163]
120 food [255 204 0]
121 step [255 0 143]
122 tank [ 0 255 235]
123 trade name [133 255 0]
124 microwave [255 0 235]
125 pot [245 0 255]
126 animal [255 0 122]
127 bicycle [255 245 0]
128 lake [ 10 190 212]
129 dishwasher [214 255 0]
130 screen [ 0 204 255]
131 blanket [ 20 0 255]
132 sculpture [255 255 0]
133 hood [ 0 153 255]
134 sconce [ 0 41 255]
135 vase [ 0 255 204]
136 traffic light [ 41 0 255]
137 tray [ 41 255 0]
138 ashcan [173 0 255]
139 fan [ 0 245 255]
140 pier [ 71 0 255]
141 crt screen [122 0 255]
142 plate [ 0 255 184]
143 monitor [ 0 92 255]
144 bulletin board [184 255 0]
145 shower [ 0 133 255]
146 radiator [255 214 0]
147 glass [ 25 194 194]
148 clock [102 255 0]
149 flag [ 92 0 255]
比如[120 120 120]就表示墙的颜色