image-resize-worker

Uses OffscreenCanvas in a worker to resize images, can be used to convert between (some) formats.

usage

install

npm install image-resize-worker

functions and types

type Resize = {
  resizeImage(f: File, opts?: ResizeOpts): Promise<File>
  resizeImageCallback(f: File, cb: (f: File) => any, opts?: ResizeOpts): void
}
type ResizeOpts = {
  name?: string // filename, defaults to input filename
  imageType?: string // mime type (image/jpeg, image/png etc) defaults to input type.
  // Used to convert between formats
  maxWidth?: number // with values < 1 it defaults to the input image's width and height
  maxHeight?: number
  resizeQuality?: "high" | "low" | "medium" | "pixelated" // defaults to high
  exportQuality?: number // quality for lossy formats like jpg. Range 0 <-> 1, defaults to 0.9
}

dev

setup

npm install

running tests

npm test

running local dev server (with demo frontend)

npm dev

build

npm build