Tips on adjusting the size of a base64 image in Angular

Question

Tips on adjusting the size of a base64 image in Angular

I have been attempting to resize a base64 image without success. I tried using canvas, but it didn't work. I'm not sure what the issue is... Here is the code snippet I used:

const canvas = document.createElement('canvas'),
             ctx = <CanvasRenderingContext2D>canvas.getContext('2d');
        canvas.width = 100;
        canvas.height = 100;
        const img = new Image();
        img.src = this.SelectedFile.src;
        ctx.drawImage(img , 0, 0, 100, 100);
        this.SelectedFile.src = ctx.canvas.toDataURL();

Does anyone have a different approach or insight into what might be causing the problem?

angular typescript base64 resize

Answer 1

Answer №1

To optimize images, you can use this external function:

function resizeImage(src, newWidth, newHeight) {
  return new Promise((resolve, reject) => {
    const image = new Image();
    image.src = src;
    image.onload = () => {
      const canvas = document.createElement('canvas');
      canvas.width = newWidth;
      canvas.height = newHeight;
      const context = canvas.getContext('2d');
      context.drawImage(image, 0, 0, newWidth, newHeight);
      const imageData = context.canvas.toDataURL();
      resolve(imageData);
    }
    image.onerror = error => reject(error);
  })
}

After defining this function, you can call it like this:

resizeImage(base64Data, 100, 100).then(resizedData => {
  this.updatedBase64 = resizedData;
})

Answer 2

To optimize images, you can use this external function:

function resizeImage(src, newWidth, newHeight) {
  return new Promise((resolve, reject) => {
    const image = new Image();
    image.src = src;
    image.onload = () => {
      const canvas = document.createElement('canvas');
      canvas.width = newWidth;
      canvas.height = newHeight;
      const context = canvas.getContext('2d');
      context.drawImage(image, 0, 0, newWidth, newHeight);
      const imageData = context.canvas.toDataURL();
      resolve(imageData);
    }
    image.onerror = error => reject(error);
  })
}

After defining this function, you can call it like this:

resizeImage(base64Data, 100, 100).then(resizedData => {
  this.updatedBase64 = resizedData;
})

Answer 3

Answer №2

I found a solution that worked well for me when I needed to resize base64 images within my angular application and HTML:

<style>
    .resized {
        width: 200px;
        height: 200px;
        transform-origin: top left;
        transform: scale(0.8);
    }
</style>

<div class="resized">
 <img src="data:image/png;base64,iVB....."></img>
</div>

Answer 4

I found a solution that worked well for me when I needed to resize base64 images within my angular application and HTML:

<style>
    .resized {
        width: 200px;
        height: 200px;
        transform-origin: top left;
        transform: scale(0.8);
    }
</style>

<div class="resized">
 <img src="data:image/png;base64,iVB....."></img>
</div>

Tips on adjusting the size of a base64 image in Angular

Answer №1

Answer №2

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