0.0.11 • Published 10 years ago

image-contrast v0.0.11

Weekly downloads
2
License
ISC
Repository
github
Last release
10 years ago

build status npm version

image-contrast

Small library to apply a contrast transformation to a image.

Install

npm install image-contrast --save

Usage

It applies a contrast transformation to a base64 image. If you want a more complete library, please check image-filters that wraps this and other libraries to provide a more complete suite of image filters.

The default operation of this library is to consume imageData and return transformed imageData, but to facilitate a bit you can pass asDataURL as true to return a dataURL that you can inject into a image tag.

var imageContrast = require('image-contrast');

var result = imageContrast({
    data: IMAGE_DATA,
    contrast: 30,
    asDataURL: true //if you want data to data transformation you don't need to include this
});

Frequent questions:

How can I get image data from a image tag?

var element = document.getElementById('#dummy-image');
var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
context.drawImage(element, 0, 0 );
var imageData = context.getImageData(0, 0, element.width, element.height);

How can I get image data from url?

var element = document.createElement('img');
element.setAttribute('src', options.url);
//...repeat process from the previous answer

How can I use the output of this?

var result = imageContrast({
    data: IMAGE_DATA,
    contrast: 30
});

var image = document.createElement('img');
image.setAttribute('src', result);

var target = document.getElementById('#dummy-target');
target.appendChild(image);
0.0.11

10 years ago

0.0.10

10 years ago

0.0.9

10 years ago

0.0.7

10 years ago

0.0.6

10 years ago

0.0.5

10 years ago

0.0.4

10 years ago

0.0.3

10 years ago

0.0.2

10 years ago

0.0.1

10 years ago