Convert tiff to jpeg in node.js and GraphicsMagick

Question

How could I convert a tiff to jpg in node.js and GraphicsMagick gm (https://aheckmann.github.io/gm/)?

I want to do this on AWS lambda, so cant write() out to disk as such.

Answer 1

Simply specify the file extension you want to the .write() method and gm will convert it automatically in that format.

const gm = require('gm');

gm('sample.tiff')
  .write('out.jpeg', function (err) {
    if (err) console.log(err);
}); 

If you need to output as buffer instead of writing to disk, you can use .toBuffer() method:

gm('sample.tiff')
  .toBuffer('jpeg', function (err, buffer) {
    if (err) console.log(err);
});

Answer 2

I don't know what's wrong but, with this library, it does not works for me. If I use:

https://www.npmjs.com/package/jimp

it works for me. Maybe this helps someone.

const Jimp = require('jimp');

try {
  const readFile = await Jimp.read(filePath)
  await readFile.writeAsync(pathToConvertedFile)
  const buffPng = await fs.readFile(pathToConvertedFile);
} catch (err) {
  console.log(err);
}