GraphicsMagick: toBuffer() Stream yields empty buffer

Question

I am trying to read a file into a buffer, resize it and then write it to disk using the following example code:

function processImage(data) {
gm(data, 'test.jpg')
    .resize('300x300')
  .background('white')
  .flatten()
  .setFormat('jpg')
  .toBuffer(function(err, buffer) {
    if (err) {
        throw err;
    } else {
        fs.writeFile('asd.jpg', buffer);
    }
  });
}

However, this generates an error Error: Stream yields empty buffer. I have played around, used imageMagick and graphicsMagick, still the same.

If i substitute
toBuffer(...
with
write('asd.jpg', function(err) ...

it actually writes a proper file.

EDIT While writing this question I found the solution, see reply

score 15 · Answer 1 · answered Sep 30 '16 at 12:09

15

Was facing the same problem, in my case: install the graphicsmagick binary.

sudo apt-get install graphicsmagick

answered Sep 30 '16 at 12:09

Edo

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4

Same here. `brew install graphicsmagick` on Mac (if you've got Homebrew installed) – jamie-wilson Oct 10 '16 at 00:06

score 9 · Accepted Answer · answered Feb 16 '16 at 12:56

9

setFormat('jpg')
caused the problems. Changing it to
setFormat('jpeg') solved it.

answered Feb 16 '16 at 12:56

Bernhardt Scherer

1,818
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Can also add extension as an argument .toBuffer('jpeg', (error, buffer) => to avoid the setFormat line. – Ian Warner Jun 07 '17 at 14:39

score 8 · Answer 3 · answered Aug 12 '17 at 17:03

Stream yields empty buffer

This indicates a general error of graphiksmagick. Here are some probable causes:

Missing Installation: you did not install graphicsmagick or imagemagick correctly. Make sure you installed both and
Invalid Parameter: remove all parameters until it works. jpg instead of jpeg is a common mistake
Wrong library You made use of graphicmagick but wanted to use imagemagick? (e.g. for webp conversion). Add imageMagick configuration:

const gm = require('gm').subClass({imageMagick: true});

Feel free to add more ideas as comment.

The Missing Installation point solved it for me—I didn't read the ReadMe and didn't realise that you had to also have GraphicsMagick installed separately. Thanks! — Steve Harrison, May 02 '18 at 08:50

score 4 · Answer 4 · answered Apr 10 '18 at 05:15

4

I also stumbled upon this error. For me the solution was to increase the allowed memory from 128Mb to 256Mb. I noticed the process needed 137Mb in order to succeed.

answered Apr 10 '18 at 05:15

Daniel Lidström

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How do you do that? Was this the node process or the imagemagick process? – Sam-Graham Oct 06 '18 at 15:18
It was the lambda process itself. – Daniel Lidström Oct 07 '18 at 16:19

score 0 · Answer 5 · answered Jan 10 '22 at 15:22

0

Error: Stream yields empty buffer

For me the solution of the error was to install both graphicsmagick and imagemagick.

Maybe it is because I use the app in node-alpine container and I want to use only graphicsmagick functionality of gm.

answered Jan 10 '22 at 15:22

Jan

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GraphicsMagick: toBuffer() Stream yields empty buffer

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