Procs
proc iccTransform(img: Image; outputProfile: string): Image {. ...raises: [VipsError], tags: [], forbids: [].}
proc toColourspace(img: Image; space: VipsInterpretation): Image {. ...raises: [VipsError], tags: [], forbids: [].}
proc toGrayscale(img: Image): Image {....raises: [VipsError], tags: [], forbids: [].}