设置raster对象的指定波段的颜色表信息，采用颜色表的JSON格式。
语法
raster ST_SetColorTable(raster rast, integer band_sn, cstring clb);参数
| 参数名称 | 描述 |
|---|---|
| rast | raster对象。 |
| band_sn | 指定的波段序号，从0开始。 |
| clb | 颜色表的JSON格式，参见ST_ColorTable |
示例
update rast set rast=ST_SetColorTable(rast,0,
'{"compsCount":4,
"entries":[
{"value":0,"c1":0,"c2":0,"c3":0,"c4":255},
{"value":1,"c1":0,"c2":0,"c3":85,"c4":255},
{"value":2,"c1":0,"c2":0,"c3":170,"c4":255}
]
}');
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(1 row)