graphicsmagick transparent is not working?

Question

I am using graphicsmagick npm:

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

I am trying to write a code like the following.
I am trying to make this work with stream ...
myimg.png is an image with white background.
I want to change the white background to transparent as stated in the npm docs using -transparent.

const gm = require('gm');
const fs = require('fs');

// ....

function makeTransparent(){
     const readStream = fs.createStream("myimg.png");
     gm(readStream)
          .transparent("#FFFFFF")
          .stream(function, err, stdout, stderr) {
              const writeStream  = fs.createWriteStream("result.png");
              stdout.pipe(writeStream);
          });
}

What am I doing wrong here?

score 0 · Answer 1 · answered Feb 28 '20 at 19:10

0

you have a lot of typos, you need to require your packages as well:

var fs = require('fs')
    , gm = require('gm');
const readStream = fs.createReadStream("myimg.jpg");
gm(readStream)
    .transparent("#FFFFFF")
    .stream(function (err, stdout, stderr) {
        const writeSTream = fs.createWriteStream("result.png");
        stdout.pipe(writeSTream);
    });

answered Feb 28 '20 at 19:10

Sunil Lama

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I already did all the requires,and what typos are you talking here? – user12822357 Feb 28 '20 at 19:11
@user12822357, you had typos in writeSTream and the function itself – Sunil Lama Feb 28 '20 at 19:11
well, my bad about the typos here, but I still have no idea what is causing the problem. thanks anyway. – user12822357 Feb 28 '20 at 19:19
Nvm. i was just being an idiot. There was a bunch of other unrelated problems elsewhere that caused this. – user12822357 Feb 28 '20 at 19:26

graphicsmagick transparent is not working?

1 Answers1