Color coded format is CMYK ?

### Checklist

- [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [X] For Python issues, I have tested with the [latest development wheel](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](http://www.open3d.org/docs/release/) and the [latest documentation](http://www.open3d.org/docs/latest/) (for `master` branch).

### My Question

python = 3.8
open3d= 0.15
In the following document, pointcloud's colors is RGB code format.
http://www.open3d.org/docs/latest/python_api/open3d.geometry.PointCloud.html?highlight=color#open3d.geometry.PointCloud.colors

But when i ues it , it looks like CMYK code format.
Code is following
```
import numpy as np
import open3d
point = np.random.normal(size=(100,3))
color = point
point_cloud = open3d.geometry.PointCloud(open3d.cpu.pybind.utility.Vector3dVector(point))
color[:, 0:3] = 1
color[:, 2] = 0
point_cloud.colors = open3d.cpu.pybind.utility.Vector3dVector(color)
open3d.visualization.draw_geometries([point_cloud], mesh_show_wireframe=False)
```
The point cloud color is yellow.
Did I do something wrong?