Last Updated: 10 Feb 2023 07:36 by ADMIN
Created on: 03 Feb 2023 12:03
Category: ColorPicker
Type: Feature Request
Eyedropper functionality request for colour picker

When my company's users create a new "customer site" they upload the customer's logo and then choose some colours that will form the basis of theming for the customer's site.  In that way, a customer will 'feel' like they have their own branded experience when using 'their' website.

The colours are inevitably based on the customer's logo.  To use the colour picker component, I have to train my users to go to Paint, load the logo, choose the colour using the colour picker, go into the palette and 'copy the crazy 6-digit numbers that may contain letters of the alphabet that starts with a #' and paste that into the colour picker of our web site.

Rather, I would prefer if they could simply use an eyedropper from the ColorPicker component using functionality similar to https://imagecolorpicker.com/en  It would save training and greatly improve the useability of my website.

Can I put that forward as being a feature request?


Dave A


1 comment
Posted on: 10 Feb 2023 07:36

Hello David,

Thank you for logging this Feature Request. We will monitor the community interest in such a feature and consider it for future implementation.

Until such a feature becomes available out-of-the-box you could implement such tool using the MDN tutorial for extracting data from a canvas element and adding a custom command to the ImageEditor for example. This way the user will eb able to upload an image, and pick a color. 


     function pick(event, canvas, ctx) {
        const bounding = canvas.getBoundingClientRect();
        const x = event.clientX - bounding.left;
        const y = event.clientY - bounding.top;
        const pixel = ctx.getImageData(x, y, 1, 1);
        const data = pixel.data;

        const rgba = `rgba(${data[0]}, ${data[1]}, ${data[2]}, ${data[3] / 255})`;

        return data
        var imageEditorNS = kendo.ui.imageeditor;

        imageEditorNS.commands.GetColorImageEditorCommand = imageEditorNS.ImageEditorCommand.extend({
        exec: function () {
            var that = this,
                options = that.options,
                imageeditor = that.imageeditor,
                canvas = imageeditor.getCanvasElement(),
                ctx = imageeditor.getCurrent2dContext(),
                image = imageeditor.getCurrentImage();

            canvas.addEventListener("click", function(event){
                var data = pick(event, canvas, ctx);
                var picker = $("#colorpicker").getKendoColorPicker();
                picker.value(`rgba(${data[0]},${data[1]},${data[2]},${data[3] / 255})`);
            },{once : true});
<div class="demo-section wide">
    <label>Selected Color:</label>
    <h3>Upload image and select color:</h3>
        .Toolbar(toolbar=>toolbar.Items(i=> {
            i.Add().Command("GetColorImageEditorCommand").Type("button").Text("Get Color").Icon("eyedropper");


Here is a sample REPL demonstrating the above. Feel free to modify the example to meet your requirements.

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