sharp vs. jimp - Node libraries to make thumbnail images
15 December 2020 1 comment Node, Firebase, JavaScript
I recently wrote a Google Firebase Cloud function that resizes images on-the-fly and after having published that I discovered that sharp is "better" than jimp. And by better I mean better performance.
To reach this conclusion I wrote a simple trick that loops over a bunch of .png and .jpg files I had lying around and compare how long it took each implementation to do that. Here are the results:
Using jimp
▶ node index.js ~/Downloads Sum size before: 41.1 MB (27 files) ... Took: 28.278s Sum size after: 337 KB
Using sharp
▶ node index.js ~/Downloads Sum size before: 41.1 MB (27 files) ... Took: 1.277s Sum size after: 200 KB
The files are in the region of 100-500KB, a couple that are 1-3MB, and 1 that is 18MB.
So basically: 28 seconds for jimp and 1.3 seconds for sharp
Bonus, the code
Don't ridicule me for my benchmarking code. These are quick hacks. Let's focus on the point.
sharp
function f1(sourcePath, destination) {
return readFile(sourcePath).then((buffer) => {
console.log(sourcePath, "is", humanFileSize(buffer.length));
return sharp(sourcePath)
.rotate()
.resize(100)
.toBuffer()
.then((data) => {
const destPath = path.join(destination, path.basename(sourcePath));
return writeFile(destPath, data).then(() => {
return stat(destPath).then((s) => s.size);
});
});
});
}
jimp
function f2(sourcePath, destination) {
return readFile(sourcePath).then((buffer) => {
console.log(sourcePath, "is", humanFileSize(buffer.length));
return Jimp.read(sourcePath).then((img) => {
const destPath = path.join(destination, path.basename(sourcePath));
img.resize(100, Jimp.AUTO);
return img.writeAsync(destPath).then(() => {
return stat(destPath).then((s) => s.size);
});
});
});
}
I test them like this:
console.time("Took");
const res = await Promise.all(files.map((file) => f1(file, destination)));
console.timeEnd("Took");
And just to be absolutely sure, I run them separately so the whole process is dedicated to one implementation.
Thanks for your post. I also used Jimp in the past, but I remember it worked slow. So I gonna try another library today. Let me go with sharp today.