In IndexedDB we have hdr images in the format of a Uint8Array. I retrieve these but need to display them in an image tag.
I have tried converting to base64 and setting image src to this with no luck.
`data:image/hdr;base64,${imageData}`
It is likely that the browser does not recognize the MIME type image/hdr. Your src prefix should be data:image/png;base64,${imageData}, see this post: How to display Base64 images in HTML?
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I'm trying to convert any type of file (e.g. pdf, xlsx, docs, etc.) into an image using javascript. I converted all files to a base64, but in image src tag when I pass base64 value it is downloading the file in format such as like doc, ppt etc, But I need in image format in JPEG or png.
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.
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 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)?
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.