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how can convert a base64 svg image to base64 image png


how can convert a base64 svg image to base64 image png

By : Gowtham Baskar
Date : November 22 2020, 03:01 PM
may help you . As both @guest271314 and I stated in the comments use canvas.toDataURL when base64 string is desired not, canvas.toBlob. Also image.onload is async so it is impossible to "return" the base64 png string. You must use callback (or Promise as @guest271314 stated).
code :
function svgString2Image(svgString, width, height, format, callback) {
    // set default for format parameter
    format = format ? format : 'png';
    // SVG data URL from SVG string
    var svgData = 'data:image/svg+xml;base64,' + btoa(unescape(encodeURIComponent(svgString)));
    // create canvas in memory(not in DOM)
    var canvas = document.createElement('canvas');
    // get canvas context for drawing on canvas
    var context = canvas.getContext('2d');
    // set canvas size
    canvas.width = width;
    canvas.height = height;
    // create image in memory(not in DOM)
    var image = new Image();
    // later when image loads run this
    image.onload = function () { // async (happens later)
        // clear canvas
        context.clearRect(0, 0, width, height);
        // draw image with SVG data to canvas
        context.drawImage(image, 0, 0, width, height);
        // snapshot canvas as png
        var pngData = canvas.toDataURL('image/' + format);
        // pass png data URL to callback
        callback(pngData);
    }; // end async
    // start loading SVG data into in memory image
    image.src = svgData;
}

// call svgString2Image function
svgString2Image(svgString, 800, 600, 'png', /* callback that gets png data URL passed to it */function (pngData) {
    // pngData is base64 png string
});


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Convert Android Base64 Bitmap and Display on HTML Base64 Image

Convert Android Base64 Bitmap and Display on HTML Base64 Image


By : pette17
Date : March 29 2020, 07:55 AM
I wish this helpful for you I had a similar issue where I wanted to convert an Android generated BASE64 string to Binary with Javascript and atob function was keep giving me errors. My first guess was like yours to use URL_SAFE instead of DEFAULT, but none of them worked, then I figure it out that I need to use Base64.NO_WRAP method to get it working. I tested Base64.NO_WRAP and displaying inline image and IT WORKED!!!!
Hope this save you some nerves, because I did had some till I figure it out how to do it.
Convert base64 PDF to base64 image, without saving it to any file

Convert base64 PDF to base64 image, without saving it to any file


By : Ashshiddiqi Razy Bus
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I do not know if it's a valid question to ask here but I'm tired of finding the solutions/libraries, so I had to ask for help from you guys. , You can use imagemagick to do that.
code :
$imagick = new Imagick();
$imagick->readImageBlob($pdfBlob);
$image->setImageFormat("jpeg")
$imageBlob = $image->getImageBlob();
Base64 convert from image not getting base64 string

Base64 convert from image not getting base64 string


By : Rashi
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , i think this could work if you use load callback because the loading is async. not sure what your fileUpload is tho, but if's a text field pasting a url
code :
function getBase64Image() {
    p = document.getElementById("fileUpload").value;
    img1.setAttribute('src', p);
    img1.setAttribute('load', fileLoaded);  
    function fileLoaded(e) {
      canvas.width = img1.width;
      canvas.height = img1.height;
      var ctx = canvas.getContext("2d");
      ctx.drawImage(img1, 0, 0);
      var dataURL = canvas.toDataURL("image/jpeg");
      $("#b64").val(dataURL);
    }
}
Load-image.js base64 image gets 10 times as large as a filereader base64 image?

Load-image.js base64 image gets 10 times as large as a filereader base64 image?


By : Abhijit
Date : March 29 2020, 07:55 AM
This might help you Once base64'ed, anything becomes approximately 33% larger.
So it cannot be that a 70K image is a 70K base64 stream, unless something got lost in transit, or you're checking the image after receiving and base64-decoding. Every 3 bytes become 4 base64 characters, so 70K must become 93K at least.
code :
    var imgDataURL = canvas.toDataURL('image/jpeg', 1.0);
How to convert an image file into its base64 representation without the leading prefix: "data:image/jpeg;base64&quo

How to convert an image file into its base64 representation without the leading prefix: "data:image/jpeg;base64&quo


By : Mohammad Arifur Rahm
Date : March 29 2020, 07:55 AM
To fix this issue Maybe base64Str.split(',').pop() is my best choice, as string.slice(start, stop) and string.substring(start, stop) require the exact index.
Seems that we are getting a data url(which has the leading meta data prefix) by using the approach I mentioned. The advantage is that that url can be used directly in some src field. This is the reason why we have that prefix in the front end world.
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