labelme生成mask颜色依次按照如下，默认256种颜色，具体请阅读代码
0,0,0
128,0,0
0,128,0
128,128,0
0,0,128
128,0,128
0,128,128
128,128,128
64,0,0
192,0,0
64,128,0
192,128,0
64,0,128
192,0,128
64,128,128
192,128,128
0,64,0
128,64,0
0,192,0
128,192,0
0,64,128
128,64,128
0,192,128
128,192,128
64,64,0
192,64,0
64,192,0
192,192,0
64,64,128
192,64,128
64,192,128
192,192,128
0,0,64
128,0,64
0,128,64
128,128,64
0,0,192
128,0,192
0,128,192
128,128,192
64,0,64
192,0,64
64,128,64
192,128,64
64,0,192
192,0,192
64,128,192
192,128,192
0,64,64
128,64,64
0,192,64
128,192,64
0,64,192
128,64,192
0,192,192
128,192,192
64,64,64
192,64,64
64,192,64
192,192,64
64,64,192
192,64,192
64,192,192
192,192,192
32,0,0
160,0,0
32,128,0
160,128,0
32,0,128
160,0,128
32,128,128
160,128,128
96,0,0
224,0,0
96,128,0
224,128,0
96,0,128
224,0,128
96,128,128
224,128,128
32,64,0
160,64,0
32,192,0
160,192,0
32,64,128
160,64,128
32,192,128
160,192,128
96,64,0
224,64,0
96,192,0
224,192,0
96,64,128
224,64,128
96,192,128
224,192,128
32,0,64
160,0,64
32,128,64
160,128,64
32,0,192
160,0,192
32,128,192
160,128,192
96,0,64
224,0,64
96,128,64
224,128,64
96,0,192
224,0,192
96,128,192
224,128,192
32,64,64
160,64,64
32,192,64
160,192,64
32,64,192
160,64,192
32,192,192
160,192,192
96,64,64
224,64,64
96,192,64
224,192,64
96,64,192
224,64,192
96,192,192
224,192,192
0,32,0
128,32,0
0,160,0
128,160,0
0,32,128
128,32,128
0,160,128
128,160,128
64,32,0
192,32,0
64,160,0
192,160,0
64,32,128
192,32,128
64,160,128
192,160,128
0,96,0
128,96,0
0,224,0
128,224,0
0,96,128
128,96,128
0,224,128
128,224,128
64,96,0
192,96,0
64,224,0
192,224,0
64,96,128
192,96,128
64,224,128
192,224,128
0,32,64
128,32,64
0,160,64
128,160,64
0,32,192
128,32,192
0,160,192
128,160,192
64,32,64
192,32,64
64,160,64
192,160,64
64,32,192
192,32,192
64,160,192
192,160,192
0,96,64
128,96,64
0,224,64
128,224,64
0,96,192
128,96,192
0,224,192
128,224,192
64,96,64
192,96,64
64,224,64
192,224,64
64,96,192
192,96,192
64,224,192
192,224,192
32,32,0
160,32,0
32,160,0
160,160,0
32,32,128
160,32,128
32,160,128
160,160,128
96,32,0
224,32,0
96,160,0
224,160,0
96,32,128
224,32,128
96,160,128
224,160,128
32,96,0
160,96,0
32,224,0
160,224,0
32,96,128
160,96,128
32,224,128
160,224,128
96,96,0
224,96,0
96,224,0
224,224,0
96,96,128
224,96,128
96,224,128
224,224,128
32,32,64
160,32,64
32,160,64
160,160,64
32,32,192
160,32,192
32,160,192
160,160,192
96,32,64
224,32,64
96,160,64
224,160,64
96,32,192
224,32,192
96,160,192
224,160,192
32,96,64
160,96,64
32,224,64
160,224,64
32,96,192
160,96,192
32,224,192
160,224,192
96,96,64
224,96,64
96,224,64
224,224,64
96,96,192
224,96,192
96,224,192
224,224,192