function keepIccProfile () {
  this.options.keepMetadata |= 0b01000;
  return this;
}
Keep ICC profile from the input image in the output image.

Where necessary, will attempt to convert the output colour space to match the profile.

@since 0.33.0

@example
const outputWithIccProfile = await sharp(inputWithIccProfile)
  .keepIccProfile()
  .toBuffer();

@returns {Sharp}