Can You Query Individual Pixel Colors from an HTML Canvas?

Accessing Pixels in HTML Canvas

Can HTML Canvas objects be interrogated to retrieve the color of specific pixels?

Answer:

Yes, you can retrieve individual pixel values from a canvas using the W3C's pixel manipulation methods.

Example:

The example below demonstrates inverting the colors of an image on the canvas:

<code class="javascript">// Obtain the CanvasPixelArray for the specified coordinates and dimensions
var imgd = context.getImageData(x, y, width, height);
var pix = imgd.data;

// Iterate over each pixel and invert its color
for (var i = 0, n = pix.length; i </code>

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