function toColourspace (colourspace) {
  if (!is.string(colourspace)) {
    throw new Error('Invalid output colourspace ' + colourspace);
  }
  this.options.colourspace = colourspace;
  return this;
}
function toColourspace (colourspace) {
  if (!is.string(colourspace)) {
    throw new Error('Invalid output colourspace ' + colourspace);
  }
  this.options.colourspace = colourspace;
  return this;
}
function toColourspace ( colourspace ) { if ( ! is . string ( colourspace ) ) { throw new Error ( 'Invalid output colourspace ' + colourspace ) ; } this . options . colourspace = colourspace ; return this ; }
Set the output colourspace.
By default output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.
@param {String} [colourspace] - output colourspace e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...](https://github.com/libvips/libvips/blob/master/libvips/iofuncs/enumtypes.c#L568)
@returns {Sharp}
@throws {Error} Invalid parameters
Set the output colourspace . By default output image will be web - friendly sRGB with additional channels interpreted as alpha channels .
Convert the colourspace to a colourspace