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var opaque = require("opaque")

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opaque v0.0.1

Detect if an image or canvas has any transparent pixels.

opaque

Browserify module for detecting if an image or canvas element has transparent pixels.

Installation

Using NPM and Browserify:

npm install opaque

As a component:

component install hughsk/opaque

Usage

opaque(element)

Returns false if transparent, or true if not.

opaque.transparent(element)

The opposite of opaque: true if transparent, false if not.

var opaque = require('opaque')
  , transparent = require('opaque').transparent

var brick = new Image
brick.src = '/brick.png'
brick.onload = function() {
  opaque(brick)      // true
  transparent(brick) // false
};

var glass = new Image
glass.src = '/glass.png'
glass.onload = function() {
  opaque(glass)      // false
  transparent(glass) // true
};

Note that an image must be fully loaded before being checked.

Metadata

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