Convert a base64 string encoded image to a tiff format in javascript

Question

I have a base64 image that I need to convert into a .tiff format. Is there a (pure) javascript way to do it please ?

NB : I saw base64 encoding was just a compress of the original file, I did this to recover the original file but now have to transform it to tiff

function urltoFile(url, filename, mimeType){ mimeType = mimeType || (url.match(/^data:([^;]+);/)||'')[1]; return (fetch(url) .then(function(res){return res.arrayBuffer();}) .then(function(buf){return new File([buf], filename, {type:mimeType});}) ); }

Does this answer your question? convert base64 to image in javascript/jquery — Pat. ANDRIA
– Pat. ANDRIA, Commented Mar 8, 2021 at 13:29
Actually, I can get the file back from the bsae64 encoded string but I need to transform it to tiff format, I can have all type of file (jpeg,png,...). To anwser your question, sadly no :( — Laurent Q.
– Laurent Q., Commented Mar 8, 2021 at 14:04

Laurent Q. · Accepted Answer · 2021-03-11 08:24:05Z

The framework I use (CEP) allow to convert local file into tiff format using this code :

//save the file in tiff format in a specified fodler csInterface.evalScript(`exportFile()`, function(path) { console.log("saved at",path); }); //in jsx function exportFile() { Folder((fnp = (aD = activeDocument).fullName.parent + '/folder/')).create(); aD.saveAs(File(fnp + aD.name), new TiffSaveOptions(), true, Extension.LOWERCASE); return activeDocument.fullName; } //then u can get it with this code csInterface.evalScript('app.documents[0].fullName.fsName', function(res) { //give the location of the current document let path = res; path = res.substring(0, res.lastIndexOf("\\")); let fileName = res.substring(res.lastIndexOf("\\")); fileName = fileName.substr(1, fileName.lastIndexOf(".")) + "tif"; path += "\\folder\\" + fileName; console.log(path); let fileInBase64 = window.cep.fs.readFile(path, cep.encoding.Base64); //transform the path to match the tif file //let fileName = res.split('\\').pop().split('/').pop(); urltoFile('data:image/png;base64,'+fileInBase64.data, fileName) .then(function(file){ console.log(file); }); });

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