get-pixels-frame-info-update

get-pixels

Given a URL/path, grab all the pixels in an image and return the result as an ndarray. Written in 100% JavaScript, works both in browserify and in node.js and has no external native dependencies.

Currently the following file formats are supported:

• PNG
• JPEG
• GIF

Example

var getPixels = require("get-pixels")
 
getPixels("lena.png", function(err, pixels, frameInfo) {
  if(err) {
    console.log("Bad image path")
    return
  }
  console.log("got pixels", pixels.shape.slice())
})

Install

npm install get-pixels

require("get-pixels")(url[, type], cb(err, pixels, frameInfo))

Reads all the pixels from url into an ndarray.

• url is the path to the file. It can be a relative path, an http url, a data url, or an in-memory Buffer.
• type is an optional mime type for the image (required when using a Buffer)
• cb(err, pixels, framesInfo) is a callback which gets triggered once the image is loaded.

Returns An ndarray of pixels in raster order having shape equal to [width, height, channels] and frameInfo param if available (for animated GIFs).

Note For animated GIFs, a 4D array is returned with shape [numFrames, width, height, 4], where each frame is a slice of the final array.

frameInfo is an Array of Objects with these fields:

Name	Type	Description
x	Integer	Image Left Position
y	Integer	Image Top Position
width	Integer	Image Width
height	Integer	Image Height
has_local_palette	Boolean	Image local palette presentation flag
palette_offset	Integer	Image palette offset
palette_size	Integer	Image palette size
data_offset	Integer	Image data offset
data_length	Integer	Image data length
transparent_index	Integer	Transparent Color Index
interlaced	Boolean	Interlace Flag
delay	Integer	Delay Time (1/100ths of a second)
disposal	Integer	Disposal method

See GIF spec for details. Summary http://www.onicos.com/staff/iz/formats/gif.html

Credits

(c) 2013-2014 Mikola Lysenko. MIT License