how to get metadata of output image?

the current example only get input image metadata, not output, if the input image’s size is 1200x1200, we get {width: 1200, height: 1200, ...} not {width: 400, height: ?, ...}

      const sharpInstance = sharp(buf).resize(400);
      const resizedBuf = await sharpInstance.toBuffer();
      const metadata = await sharpInstance.metadata();

[ajhool]

Can this be achieved without calling toBuffer? It seems like a common use-case that somebody would need to know the metadata of the transformed file.

[kghost]

@lovell Eg, I want to convert an unknown sized image to 200*100 with { fit: inside }. after resize call, the size of processed image is unknown, I need to calculate paddings and call extend to extend the image to 200*100.

I don’t know if it is a bug. After

img.resize(200,100,{fit:sharp.fit.inside})

I got an 100*100 image when input is square.