imagizer

Imagizer is a JavaScript library for image manipulation written in TypeScript. It supports both node.js (with node-canvas dependency) and browser! Also console binary is available.

Imagizer effect algorithms are based on a Jerry's Java Image Proccesing Library

Installation

npm install imagizer

If you are using webpack in your project with imagizer you must add externals definitions to your webpack configuration:

{
  'canvas': 'canvas',
  'fs': 'fs'
}

This prevents from throwing errors when bundled script is trying to load backend libraries in your frontend environment.

Usage

Project

To start an imagizer project:

browser

import imagizer from "imagizer";
const project = new imagizer.Project(projectWidth, projectHeight);

node.js

const imagizer = require("imagizer");
const project = new imagizer.Project(projectWidth, projectHeight);

projectWidth and projectHeight are dimensions of result image.

Layer

To the project you can add layer:

const layer1 = project.createLayer({
  blendingMode: "normal", // optional
});

To the layer you can add image:

const image1 = new Imagizer.Image();
image1.load("my-image.png", function () {
  const onLayerObject = layer1.put(image1, 0, 0); // put image1 on the layer1 on position 0, 0 (left upper corner)
});

"my-image.png" is a path to the image

• in frontend environment - visible in the browser at given url "/my-image.png"
• in node.js environment - path to file in filesystem

Effects

You can add multiple effects to the 'onLayerObject' - in this example it is image.

image1.load("my-image.png", function () {
  const obj = layer1.put(image1, 0, 0); // put image1 on the layer with position 0, 0
  // edge detection combo
  obj.applyEffect("edge");
  obj.applyEffect("gray-scale");
  obj.applyEffect("invert");
});

Some effects has a parameters, but if you don't pass any then the default parameters will be used.

obj.applyEffect(effectName, {
  parameter1: "value1",
  parameter2: 255,
});

You can add effect to a whole layer:

image1.load("my-image.png", function () {
  const obj = layer1.put(image1, 0, 0); // put image1 on the a layer with position 0, 0
  layer1.applyEffect("invert");
});

or whole project:

image1.load("my-image.png", function () {
  const obj = layer1.put(image1, 0, 0); // put image1 on the layer with position 0, 0
  project.applyEffect("sepia");
});

Layers support alpha compositing and the blending modes. While alpha compositing is internal process and do not require your attention the blending mode you can set by passing parameters to createLayer method.

const layer2 = project.createLayer({
  blendingMode: "average",
});

Supported blending modes

• lighten
• darken
• multiply
• average
• add
• subtract
• difference
• negation
• screen
• exclusion
• overlay
• softLight
• hardLight
• colorDodge
• colorBurn
• linearDodge
• linearBurn
• linearLight
• vividLight
• pinLight
• hardMix
• reflect
• glow
• phoenix

Resize, crop

Crop

image1.load("img/pencils.jpg", function () {
  const obj = layer1.put(image1, 0, 0);
  obj.crop(100, 100, 100, 100); // startX, startY, width, height
});

Resize

image1.load("img/pencils.jpg", function () {
  const obj = layer1.put(image1, 200, 150);
  obj.resize(200, 150 /*, mode */);
  // or
  layer1.resize(200, 150 /*, mode */);
  // or
  project.resize(200, 150);
});

Note that 'obj' and 'layer' resize do not modify Project dimensions. To rescale result image you have to change size o a project.

The following resize modes are supported:

• "nearest-neighbour" - default
• "bilinear-interpolation",
• "biquadratic-interpolation".

Supported effects

• gray-scale
• sepia
• contrast
• brightness
• diffusion
• dither
• exposure
• gain
• gamma
• gray
• hsb-adjust
• invert-alpha
• invert
• rescale
• solarize
• threshold
• tritone
• levels
• diffuse
• kaleidoscope
• pinch
• ripple
• shear
• sphere
• swim
• twirl
• water
• dissolve
• edge
• fill-color
• channel-mix
• circle
• rotate
• flip
• offset
• polar
• block
• border
• emboss

Effect parameters

Some effects support parameters. If none passed - the default value will be used.

To use effect params pass it as a second argument:

onLayerObject.applyEffect("edge", { parameter1: "someValue" });

Effect specific parameters:

contrast

defaults:

defaults: {
    contrast: 0 // between -1 and 1
}

brightness

defaults:

defaults: {
    brightness: 0 // between -1 and 1
}

diffusion

defaults: {
    matrix: [0, 0, 0, 0, 0, 7, 3, 5, 1],
    levels: 6,
    colorDither: true,
    granulate: true
},

dither

defaults: {
    matrices: {
        ditherMagic4x4Matrix: [
            0, 14, 3, 13,
            11, 5, 8, 6,
            12, 2, 15, 1,
            7, 9, 4, 10
        ],
        ditherOrdered4x4Matrix: [
            0, 8, 2, 10,
            12, 4, 14, 6,
            3, 11, 1, 9,
            15, 7, 13, 5
        ],
        ditherLines4x4Matrix: [
            0, 1, 2, 3,
            4, 5, 6, 7,
            8, 9, 10, 11,
            12, 13, 14, 15
        ],
        dither90Halftone6x6Matrix: [
            29, 18, 12, 19, 30, 34,
            17, 7, 4, 8, 20, 28,
            11, 3, 0, 1, 9, 27,
            16, 6, 2, 5, 13, 26,
            25, 15, 10, 14, 21, 31,
            33, 25, 24, 23, 33, 36
        ],
        ditherOrdered6x6Matrix: [
            1, 59, 15, 55, 2, 56, 12, 52,
            33, 17, 47, 31, 34, 18, 44, 28,
            9, 49, 5, 63, 10, 50, 6, 60,
            41, 25, 37, 21, 42, 26, 38, 22,
            3, 57, 13, 53, 0, 58, 14, 54,
            35, 19, 45, 29, 32, 16, 46, 30,
            11, 51, 7, 61, 8, 48, 4, 62,
            43, 27, 39, 23, 40, 24, 36, 20
        ],
        ditherOrdered8x8Matrix: [
            1, 235, 59, 219, 15, 231, 55, 215, 2, 232, 56, 216, 12, 228, 52, 212,
            129, 65, 187, 123, 143, 79, 183, 119, 130, 66, 184, 120, 140, 76, 180, 116,
            33, 193, 17, 251, 47, 207, 31, 247, 34, 194, 18, 248, 44, 204, 28, 244,
            161, 97, 145, 81, 175, 111, 159, 95, 162, 98, 146, 82, 172, 108, 156, 92,
            9, 225, 49, 209, 5, 239, 63, 223, 10, 226, 50, 210, 6, 236, 60, 220,
            137, 73, 177, 113, 133, 69, 191, 127, 138, 74, 178, 114, 134, 70, 188, 124,
            41, 201, 25, 241, 37, 197, 21, 255, 42, 202, 26, 242, 38, 198, 22, 252,
            169, 105, 153, 89, 165, 101, 149, 85, 170, 106, 154, 90, 166, 102, 150, 86,
            3, 233, 57, 217, 13, 229, 53, 213, 0, 234, 58, 218, 14, 230, 54, 214,
            131, 67, 185, 121, 141, 77, 181, 117, 128, 64, 186, 122, 142, 78, 182, 118,
            35, 195, 19, 249, 45, 205, 29, 245, 32, 192, 16, 250, 46, 206, 30, 246,
            163, 99, 147, 83, 173, 109, 157, 93, 160, 96, 144, 80, 174, 110, 158, 94,
            11, 227, 51, 211, 7, 237, 61, 221, 8, 224, 48, 208, 4, 238, 62, 222,
            139, 75, 179, 115, 135, 71, 189, 125, 136, 72, 176, 112, 132, 68, 190, 126,
            43, 203, 27, 243, 39, 199, 23, 253, 40, 200, 24, 240, 36, 196, 20, 254,
            171, 107, 155, 91, 167, 103, 151, 87, 168, 104, 152, 88, 164, 100, 148, 84
        ],
        ditherCluster3Matrix: [
            9, 11, 10, 8, 6, 7,
            12, 17, 16, 5, 0, 1,
            13, 14, 15, 4, 3, 2,
            8, 6, 7, 9, 11, 10,
            5, 0, 1, 12, 17, 16,
            4, 3, 2, 13, 14, 15
        ],
        ditherCluster4Matrix: [
            18, 20, 19, 16, 13, 11, 12, 15,
            27, 28, 29, 22, 4, 3, 2, 9,
            26, 31, 30, 21, 5, 0, 1, 10,
            23, 25, 24, 17, 8, 6, 7, 14,
            13, 11, 12, 15, 18, 20, 19, 16,
            4, 3, 2, 9, 27, 28, 29, 22,
            5, 0, 1, 10, 26, 31, 30, 21,
            8, 6, 7, 14, 23, 25, 24, 17
        ],
        ditherCluster8Matrix: [
            64, 69, 77, 87, 86, 76, 68, 67, 63, 58, 50, 40, 41, 51, 59, 60,
            70, 94, 100, 109, 108, 99, 93, 75, 57, 33, 27, 18, 19, 28, 34, 52,
            78, 101, 114, 116, 115, 112, 98, 83, 49, 26, 13, 11, 12, 15, 29, 44,
            88, 110, 123, 124, 125, 118, 107, 85, 39, 17, 4, 3, 2, 9, 20, 42,
            89, 111, 122, 127, 126, 117, 106, 84, 38, 16, 5, 0, 1, 10, 21, 43,
            79, 102, 119, 121, 120, 113, 97, 82, 48, 25, 8, 6, 7, 14, 30, 45,
            71, 95, 103, 104, 105, 96, 92, 74, 56, 32, 24, 23, 22, 31, 35, 53,
            65, 72, 80, 90, 91, 81, 73, 66, 62, 55, 47, 37, 36, 46, 54, 61,
            63, 58, 50, 40, 41, 51, 59, 60, 64, 69, 77, 87, 86, 76, 68, 67,
            57, 33, 27, 18, 19, 28, 34, 52, 70, 94, 100, 109, 108, 99, 93, 75,
            49, 26, 13, 11, 12, 15, 29, 44, 78, 101, 114, 116, 115, 112, 98, 83,
            39, 17, 4, 3, 2, 9, 20, 42, 88, 110, 123, 124, 125, 118, 107, 85,
            38, 16, 5, 0, 1, 10, 21, 43, 89, 111, 122, 127, 126, 117, 106, 84,
            48, 25, 8, 6, 7, 14, 30, 45, 79, 102, 119, 121, 120, 113, 97, 82,
            56, 32, 24, 23, 22, 31, 35, 53, 71, 95, 103, 104, 105, 96, 92, 74,
            62, 55, 47, 37, 36, 46, 54, 61, 65, 72, 80, 90, 91, 81, 73, 66
        ]
    },
    levels: 6,
    matrix: "ditherMagic4x4Matrix",
    colorDither: true
}

exposure

defaults: {
    exposure: 1
}

gain

defaults: {
    gammaRed: 1,
    gammaGreen: 1,
    gammaBlue: 1
},

hsb-adjust

defaults: {
    h: 1,
    s: 1,
    b: 1
}

levels

defaults: {
    low: 0,
    high: 1,
    lowOutput: 0,
    highOutput: 1
},

posterize

defaults: {
    levels: 6
},

quantize

defaults: {
    matrix: [
        0, 0, 0,
        0, 0, 7,
        3, 5, 1
    ],
    dither: true,
    numColors: 256,
    serpentine: true
},

rescale

defaults: {
    scale: 1
}

tritone

defaults: {
    shadowColor: {
        r: 0,
        g: 0,
        b: 0,
        a: 255
    },
    midColor: {
        r: 136,
        g: 136,
        b: 136,
        a: 255
    },
    highColor: {
        r: 255,
        g: 255,
        b: 255,
        a: 255
    }
},

diffuse

defaults: {
    scale: 4
},

dissolve

defaults: {
    density: 1,
    softness: 0
},

kaleidoscope

defaults: {
    centreX: 0.5,
    centreY: 0.5,
    angle: 0,
    angle2: 0,
    sides: 3,
    radius: 0
},

pinch

defaults: {
    angle: 0,
    centreX: 0.5,
    centreY: 0.5,
    radius: 100,
    amount: 0.5
},

ripple

defaults: {
    xAmplitude: 5,
    yAmplitute: 0,
    xWaveLength: 16,
    yWaveLength: 16,
    waveType: "SINE" // SAWTOOTH TRIANGLE NOISE
}

shear

defaults: {
    xAngle: 0,
    yAngle: 0,
    xOffset: 0,
    yOffset: 0
},

sphere

defaults: {
    a: 0,
    b: 0,
    centreX: 0.5,
    centreY: 0.5,
    refractionIndex: 1.5
},

swim

defaults: {
    scale: 32,
    turbulence: 0,
    amount: 1,
    time: 0,
    angle: 0,
    stretch: 1
},

twirl

defaults: {
    angle: 0,
    centreX: 0.5,
    centreY: 0.5,
    radius: 100
},

water

defaults: {
    waveLength: 16,
    amplitude: 10,
    phase: 0,
    centreX: 0.5,
    centreY: 0.5,
    radius: 50
},

edge

defaults: {
    matrixes: {
        robertsV: [
            0, 0, -1,
            0, 1, 0,
            0, 0, 0
        ],
        robertsH: [
            -1, 0, 0,
            0, 1, 0,
            0, 0, 0
        ],
        prewittV: [
            -1, 0, 1,
            -1, 0, 1,
            -1, 0, 1
        ],
        prewittH: [
            -1, -1, -1,
            0, 0, 0,
            1, 1, 1
        ],
        sobelV: [
            -1, 0, 1,
            -2, 0, 2,
            -1, 0, 1
        ],
        sobelH: [
            -1, -2, -1,
            0, 0, 0,
            1, 2, 1
        ],
        freiChenV: [
            -1, 0, 1,
            -Math.sqrt(2), 0, Math.sqrt(2),
            -1, 0, 1
        ],
        freiChenH: [
            -1, -Math.sqrt(2), -1,
            0, 0, 0,
            1, Math.sqrt(2), 1
        ]
    },
    hEdgeMatrix: "sobelV",
    vEdgeMatrix: "sobelH"
},

fill-color

defaults: {
    color: "transparent"
}

channel-mix-filter

defaults: {
    blueGreen: 1,
    redBlue: 1,
    greenRed: 1,
    intoR: 1,
    intoG: 1,
    intoB: 1
}

circle

defaults: {
    radius: 10,
    height: 20,
    angle: 0,
    spreadAngle: Math.PI,
    centreX: 0.5,
    centreY: 0.5
},

rotate

defaults: {
    angle: Math.PI
},

flip

defaults: {
    operation: "FLIP_H" // FLIP_H, FLIP_V, FLIP_HV, FLIP_90CW, FLIP_90CCW, FLIP_180
}

offset

defaults: {
    xOffset: 100,
    yOffset: 100,
    wrap: true
},

polar

defaults: {
    type: "RECT_TO_POLAR" // RECT_TO_POLAR, POLAR_TO_RECT, INVERT_IN_CIRCLE
},

block

defaults: {
    blockSize: 5
}

border

defaults: {
    leftBorder: 10,
    rightBorder: 10,
    topBorder: 10,
    bottomBorder: 10,
    borderColor: {
        r: 0,
        b: 0,
        g: 0,
        a: 255
    }
},

emboss

defaults: {
    azimuth: 135 * Math.PI / 180,
    elevation: 30 * Math.PI / 180,
    width45: 3,
    emboss: true
},

perspective

defaults: {
    x0: 0,
    y0: 0,
    x1: 1,
    y1: 0,
    x2: 1,
    y2: 1,
    x3: 0,
    y3: 1
},

Exporting result image

To export the Project (result image) you have to call:

browser

project.render(); // returns HTML Image object with src attribute set.

node.js

project.save("path/to/file.png");

Command line usage

npm install -g imagizer

Examples

imagizer --effect=EnhanceColors --input=demo/test.png --output=demo/bin-output.png --outputImageType=image/png

imagizer --effect=GrayScale --input=demo/test.png --output=demo/bin-output.png --outputImageType=image/png

imagizer --effect=Sepia --sepiaValue=1 --input=demo/test.png --output=demo/bin-output.png --outputImageType=image/png

imagizer --effect=Resize --width=100 --height=100 --input=demo/test.png --output=demo/bin-output.png --outputImageType=image/png