npm install luminanceluminance
=========
Converts an RGB image into a grayscale luminance image. This is built on the ndarray library.
``javascript
//Load up a test image
var lena = require("lena")
//Convert to grayscale
var grayscale_lena = require("luminance")(lena)
//Write the resulting png to stdout
require("save-pixels")(grayscale_lena, "png").pipe(process.stdout)
`
Which creates the following image:

npm install luminance
`javascript`
var luminance = require("luminance")
Returns A gray scale version of img
Returns A gray scale version of img, the result is stored in result`
Returns A gray scale image with red, green and blue channels in the given ndarrays
Returns A luminance image of red/green/blue with result stored in result.