I have image data in an arrayBuffer following an xmlHttpRequest. I need to display the image in an image tag. For most browsers I can use a blob to reference the binary data but I need to support mobile Safari on iOS 5.1 which has no support for blobs. My initial thought was to base64 encode the data and just set the src attribute on the image tag like so:
this.imageTag.src = 'data:image/jpeg;base64,' + base64EncodedImage;
However, in some instances the base64EncodedImage string is over 800,000 characters long and just crashes the browser.
What other method could I use to display the image (I only have access to the arrayBuffer data and can't make any server side changes easily)?
Related
I have a base64 encoded string of a .tiff image that I get from the backend. If I decode it and then create a blob url, It works fine on Internet Explorer (by using on src of img tag).
I am not able to show it on Chrome. I have read some answers related to it where people are saying it is not supported on Chrome.
There are some libraries like https://www.npmjs.com/package/tiff-to-png but they require an image to be stored somewhere and then use it to convert. I only have a base64 string of the image. I am not able to find any solution online. My UI is built with ReactJs and backend is on Node.
On backend, I have a buffer of the .tiff image which we are converting to base64 to send it to UI. If we can do anything on buffer, that is also possible. Please help.
we are using cropit for cropping image at client side then uploading base64 string to server ,
but some time for large images it crashes mobile browsers with low ram ,
is it good idea to convert base64 to blob [Creating a BLOB from a Base64 string in JavaScript then upload that on server or it will effect more mobile users as first image will be covered to based64 for cropping and then back to blob .
Base64 encoding takes up about a third more space than the original data. It was designed to safely send data through text (e.g. in mail bodies).
You're better off using the binary image, as it will be smaller and so quicker to upload.
Go with BLOB, mate.
I'm writing a web page in HTML/JavaScript. I'm downloading an image from my backend using AJAX. The image is represented as raw byte array, not an URL, so I can't use the standard <img src="{url}"> approach.
How do I display the mentioned image to the user?
Try putting this HTML snippet into your served document:
<img id="ItemPreview" src="">
Then, on JavaScript side, you can dynamically modify image's src attribute with so-called Data URL.
document.getElementById("ItemPreview").src = "data:image/png;base64," + yourByteArrayAsBase64;
Alternatively, using jQuery:
$('#ItemPreview').attr('src', `data:image/png;base64,${yourByteArrayAsBase64}`);
This assumes that your image is stored in PNG format, which is quite popular. If you use some other image format (e.g. JPEG), modify the MIME type ("image/..." part) in the URL accordingly.
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I currently have a large base64 image uri (Received via external JS script) and want to embed it into the HTML page. I did this successfully locally but now that it pulls it from another place it seems to not work, it loads part of the image then says "Image corrupt or truncated. URI in this note truncated due to length." This occurs both just in the <img> tag and using <canvas>, is there any way to load large images from uri? Or another way to display images from a base64 string?
What doesn't make sense is it works fine if I specify the base64 string as a javascript variable, but when I include it as a variable in an external script, it gives this error. Would breaking up the string then putting it back together fix this?
You shouldn't use data-URLs for huge files.
You could try to convert your base64 URL into a blob object and the blob object into a temporary blob url using the following javascript function:
function dataurlToBlobUrl(url){
var parts = url.split(',',2);
var mime = parts[0].substr(5).split(';')[0];
var blob = b64toBlob(parts[1],mime);
return URL.createObjectURL(blob);
}
And the b64toBlob function from here:
https://stackoverflow.com/a/16245768/5406901
Just make sure to use "URL.revokeObjectURL" whenever you no longer need the blob url.
Is EXIF metadata removed/deleted when an image is converted to DataURL form so it can be stored in a browsers local storage? Specifically Chrome if it makes a difference.
When you convert any image to a data URL, you're just base64 encoding the binary stream of the image file. So, in short, no.
Edit: If you are specifically drawing an image to an HTML5 Canvas and then converting its data to a data URL with its toDataUrl method, of course EXIF data of the original image would be removed, because a Canvas instance doesn't use anything but the pixel data it contains and its pixel dimensions to generate that data url (if it uses anything else its isn't obvious to me). Any data URL generated wouldn't even necessarily look like one generated from the original file as as the files could be compressed differently, even when generating lossless PNGs.
It depends how you are doing the conversion. As long as you are just base64 encoding the entire image file, then all of the metadata will be preserved. However, if you use the canvas method (https://gist.github.com/1875132) of converting an image element then I believe you will only be storing the raw image data.