convert png to jpg do not get the right picture

[ChitaGideon]

the png is this:

code:

  fs.createReadStream(file)
  .pipe(new PNGDecoder)
  //.pipe(new neuquant.Stream)
  .pipe(new JPEGEncoder)
  .pipe(fs.createWriteStream('indexed.jpg'));

and the convert result :

[devongovett]

If the png has an alpha channel, that could happen. You should try putting a color transform to rgb in the middle.

[ChitaGideon]

you are right change my code to

  fs.createReadStream(file)
  .pipe(new PNGDecoder)
  .pipe(new ColorTransform('rgb'))
  .pipe(new JPEGEncoder)
  .pipe(fs.createWriteStream('indexed.jpg'));

anything make sence