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This OpenSeadragon plugin add a method to the viewer to get the color of a pixel.

A demo is available here: https://pages.nist.gov/OpenSeadragonPixelColor/

It can be used like this:

var viewer = new OpenSeadragon.Viewer(...);
var color = viewer.getPixelColor(myPixel);
var red = color[0];
var green = color[1];
var blue = color[2];
var alpha = color[3];

The pixel coordinates must be relative to the viewer element.

Disclaimer:

This software was developed at the National Institute of Standards and Technology by employees of the Federal Government in the course of their official duties. Pursuant to title 17 Section 105 of the United States Code this software is not subject to copyright protection and is in the public domain. This software is an experimental system. NIST assumes no responsibility whatsoever for its use by other parties, and makes no guarantees, expressed or implied, about its quality, reliability, or any other characteristic. We would appreciate acknowledgement if the software is used.

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OpenSeadragon color pixel plugin.

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