Filter parametrization

[andcl]

Not really an issue, but a suggestion.
It could be really nice to somehow parametrize the effects and the amount of effect in each one, using one or more selectors for example.

[davidsonfellipe]

@andcl Hey Andrés, I started to add this with the new function for brightness, from -100 to +100

https://github.com/davidsonfellipe/lena.js/blob/master/docs/all-filters.html

Thanks for reporting

[andcl]

@davidsonfellipe Very nice job, will keep an eye on it when you arrive to the highpass filter ;)
Thanks for the response.

[davidsonfellipe]

@andcl some new filters accepting amount:

• contrast
• noise
• brightness
• thresholding

[davidsonfellipe]

@andcl alternatively you can create filters based on convolution like this.

// npm install  'lena.js'
import { convolution } from 'lena.js';

const customFilter = function (pixels) {
  const divider = 15
  const operator = [
    2 / divider,
    4 / divider,
    5 / divider,
    4 / divider,
    2 / divider,
    4 / divider,
    9 / divider,
    12 / divider,
    9 / divider,
    4 / divider,
    5 / divider,
    12 / divider,
    15 / divider,
    12 / divider,
    5 / divider,
    4 / divider,
    9 / divider,
    12 / divider,
    9 / divider,
    4 / divider,
    2 / divider,
    4 / divider,
    5 / divider,
    4 / divider,
    2 / divider,
  ]

  return convolution(pixels, operator)
}

export default customFilter