All purpose image proxy for resizing, caching and output.

Sickle.js is pretty simple - you set it up to store your files in a cache directory...

var sickle = new Sickle({
    scaleUp: false, // scale images up to required dimensions - defaults to false
    quality: 90, //set quality of output - default is 90
    cacheDirectory: "./path/to/cache/directory" // the directory in which to store your cache (must be writable)
});

then you send it a reachable URL via an object with these dimensions...

sickle.get({
	url: "https://github.com/marksyzm/sickle/raw/master/src/design/sickle.png",
	width: 50,
	height: 50,
	crop: true
}, function (err, image) {
	if (image) {
		res.setHeader("content-type", "image/png")
		res.end(image.data, "binary");
	} else res.end("Aaaargh!");
});

You can use the callback to retrieve an image object that outputs something like this:

{
  "Format": "PNG (Portable Network Graphics)",
  "format": "PNG",
  "Geometry": "300x225",
  "size": {
    "width": 300,
    "height": 225
  },
  "Class": "DirectClass",
  "Type": "true color",
  "Depth": "8 bits-per-pixel component",
  "depth": 8,
  "Channel Depths": {
    "Red": "8 bits",
    "Green": "8 bits",
    "Blue": "8 bits",
    "Opacity": "1 bits"
  },
  "Channel Statistics": {
    "Red": {
      "Minimum": "0.00 (0.0000)",
      "Maximum": "255.00 (1.0000)",
      "Mean": "94.23 (0.3695)",
      "Standard Deviation": "94.89 (0.3721)"
    },
    "Green": {
      "Minimum": "0.00 (0.0000)",
      "Maximum": "255.00 (1.0000)",
      "Mean": "93.47 (0.3665)",
      "Standard Deviation": "95.44 (0.3743)"
    },
    "Blue": {
      "Minimum": "0.00 (0.0000)",
      "Maximum": "255.00 (1.0000)",
      "Mean": "104.71 (0.4106)",
      "Standard Deviation": "91.76 (0.3598)"
    },
    "Opacity": {
      "Minimum": "0.00 (0.0000)",
      "Maximum": "0.00 (0.0000)",
      "Mean": "0.00 (0.0000)",
      "Standard Deviation": "0.00 (0.0000)"
    }
  },
  "Filesize": "1.6Ki",
  "Interlace": "No",
  "Orientation": "Unknown",
  "Background Color": "white",
  "Border Color": "#DFDFDF00",
  "Matte Color": "#BDBDBD00",
  "Page geometry": "300x225+0+0",
  "Compose": "Over",
  "Dispose": "Undefined",
  "Iterations": "0",
  "Compression": "Zip",
  "Png:IHDR.color-type-orig": "6",
  "Png:IHDR.bit-depth-orig": "8",
  "Signature": "4d697a99459ed0aa2dd2e83d1b193ea8a2cee594e8f383f33059688b0f50398b",
  "Tainted": "False",
  "path": "/path/to/cache/50-50-nocrop/c27103e5906b5689a8211b7b9d25aef2",
  "data": "<Buffer 89 50 4e 47 0d 0a 1a 0a 00 00 00 0d 49 48 44 52 00 00 01 2c 00 00 00 e1 08 06 00 00 00 72 7c 88 ab 00 00 00 06 62 4b 47 44 00 ff 00 ff 00 ff a0 bd a7 93 ...>"
}

Holy farking schnit!

Then... uh... that's it. The crop option centers and crops the image within the dimensions too, for laffs.

Dependencies

GraphicsMagick

Install

npm install sickle --save

Test

Test it from the module directory via npm test