avdown

Avdown

Avdown uses kernel averaging to down-sample images.

Please note that this is no alternative to full features image resizing libraries as you cannot define output size and there will be no interpolation for perfect fit instead we just ignore pixels at the border.

Examples

avdown(1920, 1080)
  .kernel(3) // target size 640 x 360
  .image(image) // source size 1920 x 1080
  .transform((err, image, width, height) => {
    if (err) throw err

    // else
  })

Installation

npm install avdown

Documentation

avdown(width, height)

width and height from the source image.

.image(image)

The source image as TypedArray.

.kernel(factor)

The kernel size (e.g. 3 would yield in a 3x3-Kernel). Remember that the kernel size needs to be an odd positive integer which is smaller than width or height.

.transform(callback)

No async execution but callback style api! Callback is called with err, new image with resolution width and height.

License

Copyright 2014 Bodo Kaiser [e-mail]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.