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https://github.com/rendro/vintagejs
Add a retro/vintage effect to images using the HTML5 canvas element
https://github.com/rendro/vintagejs
canvas image-processing instagram javascript retro vintage
Last synced: about 3 hours ago
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Add a retro/vintage effect to images using the HTML5 canvas element
- Host: GitHub
- URL: https://github.com/rendro/vintagejs
- Owner: rendro
- License: mit
- Created: 2011-03-07T15:50:31.000Z (over 13 years ago)
- Default Branch: master
- Last Pushed: 2023-10-17T20:41:07.000Z (about 1 year ago)
- Last Synced: 2024-10-28T09:51:58.954Z (11 days ago)
- Topics: canvas, image-processing, instagram, javascript, retro, vintage
- Language: JavaScript
- Homepage: https://vintagejs.com/
- Size: 4.07 MB
- Stars: 842
- Watchers: 46
- Forks: 116
- Open Issues: 1
-
Metadata Files:
- Readme: Readme.md
- License: LICENSE
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README
# vintageJS
> Add a retro/vintage effect to images using the HTML5 canvas element.
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[](https://greenkeeper.io/)
## Installation
```
$ npm install vintagejs
```
## How to use
`vintagejs` is a function that takes a source (URL, ImageElement or CanvasElement) and an effect (object with all the options) and returns a Promise that resolves to a result object.
```javascript
vintagejs('./path/to/picture.jpg', { brightness: 0.2 })
.then(res => res.genImage())
.then(img => document.body.appendChild(img));
```
The result object provides the following methods to access the modified image data:
```javascript
// returns the data url of the updated image. Use it to update the source of an existing image
getDataURL(mimeType?: string, quality?: number): string;
// returns the canvas with the updated image. Use it to draw your changes onto another canvas
getCanvas(): HTMLCanvasElement;
// returns a promise that resolves to an HTMLImageElement of the updated image
genImage(mimeType?: string, quality?: number): Promise;
```
If not provided, mimeType defaults to `image/jpeg` and quality defaults to `1`.
### More Examples
```javascript
// use an image as source and update image with data url
const srcEl = document.querySelector('img.myImage');
vintagejs(srcEl, { brightness: 0.2 })
.then(res => {
srcEl.src = res.getDataURL();
});
// use a canvas as source and draw result to canvas
const srcEl = document.querySelector('canvas.myCanvas');
const ctx = srcEl.getContext('2d');
vintagejs(srcEl, { brightness: 0.2 })
.then(res => {
ctx.drawImage(res.getCanvas(), 0, 0, srcEl.width, srcEl.height);
});
```
## Effect options
```javascript
type TEffect = {
curves: false | TCurve, // default: false
screen: false | TRGBAColor, // default: false
saturation: number, // float between 0 and 1, default: 1
vignette: number, // float between 0 and 1, default: 0
lighten: number, // float between 0 and 1, default: 0
viewfinder: false | string, // string must be URL, default: false
sepia: boolean, // default: false
gray: boolean, // default: false
brightness: number, // float between -1 and 1, default: 0
contrast: number, // float between -1 and 1, default: 0
};
// every channel, r=red, g=green, b=blue serves as a look up table for color mappings
type TCurve = {
r: Array | Uint8ClampedArray, // array of int between 0 and 255, length of array === 256
g: Array | Uint8ClampedArray, // array of int between 0 and 255, length of array === 256
b: Array | Uint8ClampedArray, // array of int between 0 and 255, length of array === 256
};
type TRGBAColor = {
r: Uint8, // int between 0 and 255
g: Uint8, // int between 0 and 255
b: Uint8, // int between 0 and 255
a: number, // float between 0 and 1
};
```
### Examples
```javascript
const noEffect = {};
const effect_1 = {
brightness: -0.2,
contrast: 0.15,
};
const effect_2 = {
brightness: 0.1,
vignette: 0.3,
viewfinder: './film-1.jpg',
screen: {
r: 227,
g: 12,
b: 169,
a: 0.15,
},
};
```
See examples folder for more examples.
## Browser support
Check support for the canvas element [canisue.com/canvas](http://caniuse.com/canvas).
Higher performance when canvas blend modes are supported [caniuse.com/#feat=canvas-blending](http://caniuse.com/#feat=canvas-blending), but fallbacks are implemented.
## License
[MIT](http://www.opensource.org/licenses/mit-license.php)
## Changelog
### 2.2.0
* Added true grayscale effect (Thanks @bjornbos for PR #38)
### 2.1.0
* Add support for strings (URI or base64 encoded data-uri) as a source
### 2.0.0
* Rewrite from ground up
* Functional API
### 1.1.5
* Added "main" field to package.json
### 1.1.4
* Added universal module definition (umd) wrapper
### 1.1.3
* Added minified versions
* Fixed same-origin error
### 1.1.2
* added AngularJS support thanks to [@dpiccone](https://github.com/dpiccone)
* grunt based build script for all versions
### 1.1.1
* performance improvements
* new effect options:
* brightness
* contrast
### 1.1.0
* Improved core performance
### 1.0.0
* Initial release