is-colorful

Tells whether given image is colorful (or whether it is not monochromatic).

Here's how to currently works:

1. Resizing image to achieve maximum dimension size, for faster processing
2. Iterating through all pixels in resized image
3. Converting them to HSL representation
4. Selecting pixels with lightness in (minLightness..maxLightness) range and saturation > minSaturation
5. Telling whether difference between minimum and maximum hue of selected pixels is greather than threshold

CLI Usage

Usage
  $ is-colorful <filename>

Options
  --resize          Area side in pixels to fit image to if it's larger (default: 400)
  --min-lightness   Minimum lightness of pixel to consider it (default: 30)
  --max-lightness   Maximum lightness of pixel to consider it (default: 70)
  --min-saturation  Maximum saturation of pixel to consider it (default: 70)
  --threshold       Minimum hue difference in considered pixels (deafult: 90)

Return code:

  - 0 if image is colorul
  - 1 on command failure
  - 2 if image is not colorful

Examples
  $ is-colorful pale-face.jpg --min-saturation 40

Programmatic usage

isColorful(path, options)

Options are the same like in CLI, but camel cased.

import isColorful from 'is-colorful'

isColorful('pale-face.jpg', { minSaturation: 40 }).then((colorful) => {
  if (colorful) {
    console.log('Image is colorful!')
  }
})

License

MIT