Expose setting xres/yres for JPEG/PNG output

Hi!

I saw that in the documentation it is possible to adjust the density metadata in the constructor, but it doesn’t work in my case for some reason. Below is the code which works but the density is never adjusted. Does anyone know how I can do this with the code snippet below?

Thanks!

const sharpImage = sharp(imagedData /* tried adding density here ... , {density: 170} */)
      sharpImage
      .rotate()
      .metadata()
      .then(function(metadata) {
        return sharpImage
                .extract({
                  left: Math.round(metadata.width * parasedBody.x),
                  top: Math.round(metadata.height * parasedBody.y),
                  width: Math.round(metadata.width * parasedBody.width),
                  height: Math.round(metadata.height * parasedBody.height)})
                .toBuffer((err, outputBuffer, info) => {
                  console.log("BUFF FUNC ERR", err);
                  console.log("BUFF FUNC outputBuffer", outputBuffer);
                  console.log("BUFF FUNC info", info);
                })
        })

[lovell]

v0.28.2 is now available.

[lovell]

Commit https://github.com/lovell/sharp/commit/4237f5520f6dfcae2706e6d7ffe3cc3d3e05a604 adds a new output density property to withMetadata() to set the DPI resolution, which keeps things consistent with the input density property of metadata().

// Available from v0.28.2

const data = await sharp(input)
  .withMetadata({ density: 96 })
  .toBuffer();

This will be in v0.28.2.