This example uses OpenLayers v10.9.0. The latest is v.
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#### Icon Pixel Operations

vector 86 style 27 icon 9 marker 6 canvas 6 select 4

#####

Canvas pixel operations on a point icon.

Example using an icon to symbolize a point. Click on the icon to select it, and it will be rendered using its negative image.

##### main.js

    import Feature from 'ol/Feature.js';
    import Map from 'ol/Map.js';
    import View from 'ol/View.js';
    import Point from 'ol/geom/Point.js';
    import Select from 'ol/interaction/Select.js';
    import TileLayer from 'ol/layer/Tile.js';
    import VectorLayer from 'ol/layer/Vector.js';
    import StadiaMaps from 'ol/source/StadiaMaps.js';
    import VectorSource from 'ol/source/Vector.js';
    import Icon from 'ol/style/Icon.js';
    import Style from 'ol/style/Style.js';

    function createStyle(src, img) {
      return new Style({
        image: new Icon({
          anchor: [0.5, 0.96],
          crossOrigin: 'anonymous',
          src: src,
          img: img,
        }),
      });
    }

    const iconFeature = new Feature(new Point([0, 0]));
    iconFeature.set('style', createStyle('data/icon.png', undefined));

    const map = new Map({
      layers: [
        new TileLayer({
          source: new StadiaMaps({layer: 'stamen_watercolor'}),
        }),
        new VectorLayer({
          style: function (feature) {
            return feature.get('style');
          },
          source: new VectorSource({features: [iconFeature]}),
        }),
      ],
      target: document.getElementById('map'),
      view: new View({
        center: [0, 0],
        zoom: 3,
      }),
    });

    const selectStyle = {};
    const select = new Select({
      style: function (feature) {
        const image = feature.get('style').getImage().getImage();
        if (!selectStyle[image.src]) {
          const canvas = document.createElement('canvas');
          const context = canvas.getContext('2d');
          canvas.width = image.width;
          canvas.height = image.height;
          context.drawImage(image, 0, 0, image.width, image.height);
          const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
          const data = imageData.data;
          for (let i = 0, ii = data.length; i < ii; i = i + (i % 4 == 2 ? 2 : 1)) {
            data[i] = 255 - data[i];
          }
          context.putImageData(imageData, 0, 0);
          selectStyle[image.src] = createStyle(undefined, canvas);
        }
        return selectStyle[image.src];
      },
    });
    map.addInteraction(select);

    map.on('pointermove', function (evt) {
      map.getTargetElement().style.cursor = map.hasFeatureAtPixel(evt.pixel)
        ? 'pointer'
        : '';
    });

##### index.html

    <!DOCTYPE html>
    <html lang="en">
      <head>
        <meta charset="UTF-8">
        <title>Icon Pixel Operations</title>
        <link rel="stylesheet" href="node_modules/ol/ol.css">
        <style>
          .map {
            width: 100%;
            height: 400px;
          }
        </style>
      </head>
      <body>
        <div id="map" class="map"></div>

        <script type="module" src="main.js"></script>
      </body>
    </html>

##### package.json

    {
      "name": "icon-negative",
      "dependencies": {
        "ol": "10.9.0"
      },
      "devDependencies": {
        "vite": "^3.2.3"
      },
      "scripts": {
        "start": "vite",
        "build": "vite build"
      }
    }