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node.jsimageimagemagicknode-imagemagick

NodeJS ImageMagick How to convert Image with Transparent background

I want to convert my png with white background to transparent background png.

Here is my code.

im.convert(
        [source, '-flatten', '-transparent', path_to],
        function (err, stdout) {
          if (err) {
            reject(err);
          }
          resolve(stdout);
        },
      );

And im getting this error.

Error: Command failed: convert:  `./../uploads/resized_613c98fa-e56e-4a57-ba70-9b1178ad7179.png' @ error/convert.c/ConvertImageCommand/3319.

I'm not able to use 'transparent'. How can i do it?

Solution

  • If you want to make white transparent, you need:

    ... '-flatten', '-transparent', 'white' ...

    If you need nearly whites to become transparent as well as pure whites, add some fuzz beforehand:

    ... '-flatten', '-fuzz', '20%' ...