Tips for resizing an image to perfectly fit on a compact HTML5 canvas without sacrificing its quality

I need assistance with my code. I'm trying to draw an image on the canvas while maintaining its quality.

const canvas = document.getElementById("canvas");
const context = canvas.getContext("2d");
canvas.width = 360px;
canvas.height = 360px;
const img = new Image();
img.src = "some-image.jpg"; // image dimensions are 3840*2594px

var scale = Math.min(
        canvas.width / img.width,
        canvas.height / img.height
      );
      // determine top left coordinates of the image
      var x = canvas.width / 2 - (img.width / 2) * scale;
      var y = canvas.height / 2 - (img.height / 2) * scale;

context.drawImage(img, x, y, img.width * scale, img.height * scale);

Answer №1

For those seeking answers, you can find more information on this question here: .

The issue at hand is that JavaScript lacks efficient algorithms for image resizing; it primarily reduces the number of pixels in an image (with the exception of Google Chrome's experimental imageSmoothingQuality feature).

There exist third-party libraries and efforts to incorporate bicubic and bilinear image sampling techniques. To explore these further, check out this website for detailed explanations and code samples: .

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