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an RGB image into a [grayscale luminance](http://en.wikipedia.org/wiki/Grayscale) image.  This is built on the [ndarray library](https://github.com/mikolalysenko/ndarray).\n\n## Example\n\n```javascript\n//Load up a test image\nvar lena = require(\"lena\")\n\n//Convert to grayscale\nvar grayscale_lena = require(\"luminance\")(lena)\n\n//Write the resulting png to stdout\nrequire(\"save-pixels\")(grayscale_lena, \"png\").pipe(process.stdout)\n```\n\nWhich creates the following image:\n\n<img src=\"https://raw.github.com/mikolalysenko/luminance/master/examples/lena.png\">\n\n## Install\n\n    npm install luminance\n    \n## API\n\n```javascript\nvar luminance = require(\"luminance\")\n```\n\n### `luminance(img)`\n\n**Returns** A gray scale version of `img`\n\n### `luminance(result, img)`\n\n**Returns** A gray scale version of `img`, the result is stored in `result`\n\n### `luminance(red, green, blue)`\n\n**Returns** A gray scale image with red, green and blue channels in the given ndarrays\n\n### `luminance(result, red, green, blue)`\n\n**Returns** A luminance image of red/green/blue with result stored in result.\n\n## Credits\n(c) 2013 Mikola Lysenko. MIT License","maintainers":[{"email":"mikolalysenko@gmail.com","name":"mikolalysenko"},{"email":"th.v.d.gronde@hccnet.nl","name":"jaspervdg"},{"email":"hughskennedy@gmail.com","name":"hughsk"},{"email":"pgb@andrew.cmu.edu","name":"planeshifter"},{"email":"rsreusser@gmail.com","name":"rreusser"}],"time":{"modified":"2022-11-08T10:39:56.538Z","created":"2013-05-15T18:10:54.020Z","0.0.0":"2013-05-15T18:10:57.548Z","1.0.0":"2013-06-26T17:40:16.019Z","1.0.1":"2013-08-15T22:07:14.370Z","1.0.2":"2013-08-15T22:09:11.244Z","1.0.3":"2014-04-29T01:34:54.636Z"},"author":{"name":"Mikola Lysenko"},"repository":{"type":"git","url":"git://github.com/mikolalysenko/luminance.git"},"homepage":"https://github.com/mikolalysenko/luminance","keywords":["luminance","grayscale","ndarray","convert","rgb","red","green","blue","color","black","and","white","intensity","image"],"bugs":{"url":"https://github.com/mikolalysenko/luminance/issues"},"license":"MIT","readmeFilename":"README.md"}