Is there any way to manipulate the brightness of the image through Canvas?

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I am developing a system where the user can make small adjustments in images, being able to rotate and cut currently. Before this whole part was being done through coordinates, where I sent the parameters to the server and from there processed the images.

I've now started to use canvas , where I can already make these edits directly in the client (browser) and then send the final image already edited.

When viewing the power of canvas I thought of adding other features, such as increasing / decreasing the brightness of some images.

Is there any way to control the brightness of the image through canvas ?

Please, if the answer involves mathematical calculations, I would like an explanation, not just the code that generates the desired result.

Let's re-use the parrot picture as an example: 

window.addEventListener('load', onLoadPage)

function qs(selector) {
    return document.querySelector(selector);
}

function onLoadPage()
{
  
    var canvas    = qs('#canvas');
    var image     = qs('#image');

    canvas.height = image.height;
    canvas.width = image.width;

    var context = canvas.getContext('2d');

    context.drawImage(image, 0, 0);

}
<img id="image" src='data:image/jpeg;base64,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'>
<canvas id="canvas" height="0"></canvas>
    
asked by anonymous 11.05.2017 / 16:58

1 answer

4

In summary, and in an easy way, simply multiply the values of RGB (separately) by a value. If the value is greater than 1, you are increasing the brightness. With this, of course, if the value is less than 1, you will decrease the brightness.

Starting from this method, just apply it in your model.

Below I'll be adding an example of how to do this in canvas . 

var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
var imagem = document.getElementById('image');


var img = new Image();
img.onload = function() {
  var imgX = canvas.width - img.width;
  var imgY = canvas.height - img.height;

  context.drawImage(img, imgX, imgY);

  var imageData = context.getImageData(imgX, imgY, img.width, img.height);
  var ia = imageData.data;

  //Valor multiplicador
  var multiplicador = 1.5;

  for (var i = 0; i < ia.length; i += 4) {
    //Obter o valor de RGB
    var red = ia[i];
    var green = ia[i + 1];
    var blue = ia[i + 2];

    //Multiplica pelo multiplicador
    var brilhoRed = multiplicador * red;
    var brilhoGreen = multiplicador * green;
    var brilhoBlue = multiplicador * blue;

    //Retorna o valor do RGB novo
    ia[i] = brilhoRed;
    ia[i + 1] = brilhoGreen;
    ia[i + 2] = brilhoBlue;
  }

  context.putImageData(imageData, imgX, imgY);
};

img.src = imagem.src;
<canvas id="myCanvas" width="578" height="200"></canvas>

<img id="image" 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Now, if you do not want to do this "manually", you could use the CanvasEffect , so you can change things more easily .

See an example usage here.

References:

11.05.2017 / 20:40
What is the best way to turn a secure contact form? Select the two largest values of a tuple