Buffer to image node js

Question

I'm working on a server/client communication in node js. Every second, the server send an image (taking by a camera) to the client.

The message structure contains among other things:

BufferX : the width of the image
BufferY : the height of the image
BufferImage : Bytes array containing pixel

The problem is: I would like to convert this buffer to an image and save it.

At first I try this:

let array = new Uint8Array(BufferImage  );
fs.writeFileSync("data.png",array)

But the image isn't readable because the buffer only contains raw pixels data.

I've copy past the buffer to a python script, convert to a numpy array and reshape it. The image is correct so I'm sure that the ImageBuffer contains the correct value.

So is it possible to convert a raw pixel buffer to an image ?

Have you tried sharp?

iLuvLogix
– iLuvLogix

2021-02-25 15:00:00 +00:00
Commented Feb 25, 2021 at 15:00 — iLuvLogix
– iLuvLogix, Commented Feb 25, 2021 at 15:00
I did not know this module, I will take a look. Thank you

Fedour
– Fedour

2021-02-25 15:03:02 +00:00
Commented Feb 25, 2021 at 15:03 — Fedour
– Fedour, Commented Feb 25, 2021 at 15:03
did you solve the issue?

Alexey Sh.
– Alexey Sh.

2022-10-23 23:26:21 +00:00
Commented Oct 23, 2022 at 23:26 — Alexey Sh.
– Alexey Sh., Commented Oct 23, 2022 at 23:26

Gabriel José · Accepted Answer · 2021-02-25 15:35:06Z

1

Have you tried:

let array = new Uint8Array(BufferImage);
fs.writeFileSync("data.png", Buffer.from(array).toString('base64'))

answered Feb 25, 2021 at 15:35

Gabriel José

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1 Comment

Fedour Over a year ago

Yes I've tried something similar but it's doesn't work. I supposed that the writeFileSync function can not reshape the buffer with the good dimensions. The width and the height of the image isn't stored in the image BufferImage, it only contains raw pixels value

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