Looking to adjust the HSL of individual colors on a JavaScript canvas, similar to editing in Photoshop?

I'm looking to manipulate the HSL of an image using Javascript. I don't want to apply changes to the entire image at once, but rather target specific color sets like blues and yellows, similar to how it's done in Photoshop.

  • What type of data structure should I use for this task?
  • Are there specific formulas available for mapping these colors?
  • Is there a library that could assist me with this process?

Thank you!

https://i.stack.imgur.com/bYOUK.png

Answer №1

To achieve this effect, you can utilize a combination of blending mode and pixel iteration:

  • Firstly, extract the bitmap and iterate through each pixel.
  • Next, for every pixel, check if it falls within a specific range (e.g., "blues") on the HSL color wheel. Additionally, incorporate variable width to account for varying intensities towards the edges. Eliminate any pixels that do not meet the criteria.
  • Subsequently, place the modified bitmap onto a fresh canvas.
  • Set the fill style to the desired destination HSL value (you can directly specify HSL with fill-style, like "
    ctx.fillStyle = "hsl(180,100%,50%)"
    ") and fill the entire canvas using compositing mode "destination-over" to alter the overall color.
  • Adjust the blending mode on the main canvas to "color" and overlay the extracted pixel canvas on top.

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Executing a script that has been inserted into the page post-loading

I'm facing an issue where the script tag at the bottom of my project is not being executed after adding new pages later on. Main const fetch = (url, call) => { var xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if ...

What is the best way to position a tooltip near an element for optimal visibility?

One div is located on the page as follows: <div id="tip"> Text for tip goes here... </div> And another one can be found below: <div class="element"> Text for element goes here... </div> There is also a piece of JavaScript ...

Exploring the Dynamics of AngularJS: Leveraging ng-repeat and ng-show

Recently, I came across this code snippet: <div class="map" ng-controller="DealerMarkerListCtrl"> <a ng-click="showdetails=!showdetails" href="#/dealer/{{marker.id}}" class="marker" style="left:{{marker.left}}px;top:{{marker.top}}px" ng-rep ...

"Oops, it seems like there are an excessive number of connections in Express MySQL causing

While programming in Angular and creating an API server in Express, I encountered a minor issue after spending hours coding and making requests to the API. The problem arises when the maximum number of requests is reached, resulting in an error. Everythin ...

Is there a way to prevent an iframe from being recorded in Chrome's browsing history?

I'm in the process of developing a Chrome extension that inserts an Angular application into the user's browser window to create an interactive sidebar. I've been successful in most of my goals by inserting an iframe through a content script ...

What are the steps to ensure the equalizer start button functions properly?

I have created an application that mimics the functionality of an equalizer by displaying changes in audio frequencies. Issues with animation arise when you click the "Start" button again. The animation resets and begins from the start. This can be pr ...

React: The getDerivedStateFromProps method does not allow the invocation of functions

I can't seem to figure out why I keep getting a TypeError - Cannot read property 'getTodosList' of null when trying to call the getTodosList function inside the getDerivedStateFromProps method. Furthermore, after implementing the getDerived ...

Navigate through each file or image within a directory using Angular

I am facing a challenge with my app where each product has a gallery containing a random number of images, each with a completely unique name. These images are located in /src/assets/images/products/:id/. Currently, I am struggling to loop through and add ...

Storing repeated inputs in local storage multiple times

I am working on a feature where I need to store data in local storage multiple times using a dropdown menu and some input fields. Currently, I am able to retrieve all the values from the input fields and see them in the console log. My goal is to save thes ...

Button halts the playback of numerous audio tracks simultaneously

I'm in the process of creating a Launchpad, where each row consists of 8 buttons/audio tracks and a stop button. My goal is for each stop button to halt all audio playing on that specific row when pressed—for instance, pressing Stop Button 1 would c ...

Transferring data from a class method to a React component

Situation: In a React component, I have a class with its own methods that is instantiated. What I'm needing: One of the methods in the class changes the value of an input (referred to as `this.$el`) using `.val()`. However, I need to pass this value ...

Utilize VueJS to upload and visualize a file input on your website

I am currently working with TypeScript and Haml in conjunction with vue.js. My goal is to enable users to upload and view a file seamlessly using the vue.js framework. I have successfully managed to upload an image, however, I am facing an issue where the ...

Utilizing Sequelize's Where clause with the flexibility of optional parameters

Can you guide me on writing Sequelize queries with optional parameters? Consider the below query example: const result : SomeModel[] = await SomeModel.findAll( {where: { id: givenId, ...

Guide on accessing and displaying data table values in console.log using Vue.js and vuetify

Hello, I am new to Vue.js and I am trying to work with data tables. I have copied some code from the Vuetify website and I am attempting to call the desserts' names from a sample table using console.log. Below is the code snippet: <template> ...

What is the best way to ensure that an ASync function only continues once all necessary information has been collected?

retrieveStudentGrades() { let grades = {}; let totalStudents = this.state.studentDetails.length; let studentCount = 0; this.state.courses.map((course) => { this.state.studentDetails.map((student) => { request.get( ...

Obtain the template as a string within Vue

Let's examine the scenario of having a single file component in Vue with the following structure: // Article.vue <template> <div> <h1>{{title}}</h1> <p>{{body}}</p> </div> </template> If w ...

Issue: Unable to assign type 'FormDataEntryValue' to type 'string'. Type 'File' cannot be assigned to type 'string'

After retrieving data from the formData, I need to pass it to a function for sending an email. Error: The error message states that 'FormDataEntryValue' is not compatible with type 'string | null'.ts(2322) definitions.ts(119, 3): The e ...

Adding labels to a JavaScript chart can be done by using the appropriate methods

https://i.stack.imgur.com/uEgZg.png https://i.stack.imgur.com/y6Jg2.png Hey there! I recently created a chart using the Victory.js framework (check out image 1) and now I'm looking to incorporate labels similar to the ones shown in the second image ab ...

Issue - Basic Data Protection and Unscrambling - Node.js

I have been working on some basic code to encrypt and decrypt text, but I keep encountering an error when using the .final() function of createDecipherIV. I have tried experimenting with different encodings like Binary, Hex, and base64. Node Version: &apo ...

Leveraging the power of the three.js library on the client-side within a vue.js/n

I'm facing a challenge with incorporating the three.js library (installed via npm) to display 3D models on the client side within my nuxt.js application. Despite multiple attempts, I seem to be hitting a roadblock with the import not functioning prope ...