cell backgroundColor doesn't work as expected

[nonacc]

Node version: v16.13.0 NPM version: 8.1.0 Package version: 3.3.0

What I do, cell.backgroundColor = { alpha: 1, red: 234, green: 179, blue: 138 }

Color I expect to get: #EAB38A

Color I actually get : #264C73 In RGB : { alpha: 1, red: 38, green: 76, blue: 115}

Any ideas?