@jimp/plugin-color

Jimp color methods.

Bitmap manipulation to adjust the color in an image.

color

Apply multiple color modification rules

@param {array} actions list of color modification rules, in following format: { apply: '<rule-name>', params: [ <rule-parameters> ] }
@param {function(Error, Jimp)} cb (optional) a callback for when complete

import jimp from 'jimp';

async function main() {
  const image = await jimp.read('test/image.png');

  image.color([{ apply: 'red', params: [100] }]);
}

main();

Jimp supports advanced colour manipulation using a single method as follows:

image.color([
  { apply: 'hue', params: [-90] },
  { apply: 'lighten', params: [50] },
  { apply: 'xor', params: ['#06D'] }
]);

The method supports the following modifiers:

Modifier	Description
lighten {amount}	Lighten the color a given amount, from 0 to 100. Providing 100 will always return white (works through TinyColor)
brighten {amount}	Brighten the color a given amount, from 0 to 100 (works through TinyColor)
darken {amount}	Darken the color a given amount, from 0 to 100. Providing 100 will always return black (works through TinyColor)
desaturate {amount}	Desaturate the color a given amount, from 0 to 100. Providing 100 will is the same as calling greyscale (works through TinyColor)
saturate {amount}	Saturate the color a given amount, from 0 to 100 (works through TinyColor)
greyscale {amount}	Completely desaturates a color into greyscale (works through TinyColor)
spin {degree}	Spin the hue a given amount, from -360 to 360. Calling with 0, 360, or -360 will do nothing - since it sets the hue back to what it was before. (works through TinyColor)
hue {degree}	Alias for spin
mix {color, amount}	Mixes colors by their RGB component values. Amount is opacity of overlaying color
tint {amount}	Same as applying mix with white color
shade {amount}	Same as applying mix with black color
xor {color}	Treats the two colors as bitfields and applies an XOR operation to the red, green, and blue components
red {amount}	Modify Red component by a given amount
green {amount}	Modify Green component by a given amount
blue {amount}	Modify Blue component by a given amount

brightness

Adjusts the brightness of the image

@param {number} val the amount to adjust the brightness, a number between -1 and +1
@param {function(Error, Jimp)} cb (optional) a callback for when complete

import jimp from 'jimp';

async function main() {
  const image = await jimp.read('test/image.png');

  image.brightness(20);
}

main();

contrast

Adjusts the contrast of the image

@param {number} val the amount to adjust the contrast, a number between -1 and +1
@param {function(Error, Jimp)} cb (optional) a callback for when complete

import jimp from 'jimp';

async function main() {
  const image = await jimp.read('test/image.png');

  image.contrast(70);
}

main();

posterize

Apply a posterize effect

@param {number} n the amount to adjust the contrast, minimum threshold is two
@param {function(Error, Jimp)} cb (optional) a callback for when complete

import jimp from 'jimp';

async function main() {
  const image = await jimp.read('test/image.png');

  image.posterize(5);
}

main();

opacity

Multiplies the opacity of each pixel by a factor between 0 and 1

@param {number} f A number, the factor by which to multiply the opacity of each pixel
@param {function(Error, Jimp)} cb (optional) a callback for when complete

import jimp from 'jimp';

async function main() {
  const image = await jimp.read('test/image.png');

  image.opacity(80);
}

main();

sepia

Applies a sepia tone to the image

@param {function(Error, Jimp)} cb (optional) a callback for when complete

import jimp from 'jimp';

async function main() {
  const image = await jimp.read('test/image.png');

  image.sepia();
}

main();

fade

Fades each pixel by a factor between 0 and 1

@param {number} f A number from 0 to 1. 0 will haven no effect. 1 will turn the image completely transparent.
@param {function(Error, Jimp)} cb (optional) a callback for when complete

import jimp from 'jimp';

async function main() {
  const image = await jimp.read('test/image.png');

  image.fade(0.7);
}

main();

convolution

Sum neighbor pixels weighted by the kernel matrix. You can find a nice explanation with examples at GIMP's Convolution Matrix plugin

@param {array} kernel a matrix to weight the neighbors sum
@param {string} edgeHandling (optional) define how to sum pixels from outside the border
@param {function(Error, Jimp)} cb (optional) a callback for when complete

import jimp from 'jimp';

async function main() {
  const image = await jimp.read('test/image.png');

  // make me better
  image.convolution(weights);
}

main();

opaque

Set the alpha channel on every pixel to fully opaque

@param {function(Error, Jimp)} cb (optional) a callback for when complete

import jimp from 'jimp';

async function main() {
  const image = await jimp.read('test/image.png');

  image.opaque();
}

main();

pixelate

Pixelates the image or a region

@param {number} size the size of the pixels
@param {number} x (optional) the x position of the region to pixelate
@param {number} y (optional) the y position of the region to pixelate
@param {number} w (optional) the width of the region to pixelate
@param {number} h (optional) the height of the region to pixelate
@param {function(Error, Jimp)} cb (optional) a callback for when complete

import jimp from 'jimp';

async function main() {
  const image = await jimp.read('test/image.png');

  image.pixelate(10);
}

main();

convolute

Applies a convolution kernel to the image or a region

@param {array} kernel the convolution kernel
@param {number} x (optional) the x position of the region to apply convolution to
@param {number} y (optional) the y position of the region to apply convolution to
@param {number} w (optional) the width of the region to apply convolution to
@param {number} h (optional) the height of the region to apply convolution to
@param {function(Error, Jimp)} cb (optional) a callback for when complete

import jimp from 'jimp';

async function main() {
  const image = await jimp.read('test/image.png');

  // make me better
  image.pixelate(kernal);
}

main();

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