proc addAlpha(img: Image): Image {....raises: [VipsError], tags: [], forbids: [].}

proc bandJoin(images: openArray[Image]): Image {.
    ...raises: [ValueError, VipsError], tags: [], forbids: [].}

proc bandJoin(img: Image; other: Image): Image {....raises: [VipsError], tags: [],
    forbids: [].}

proc bandMean(img: Image): Image {....raises: [VipsError], tags: [], forbids: [].}

proc blendAdd(img: Image; overlay: Image): Image {....raises: [VipsError],
    tags: [], forbids: [].}

proc blendDarken(img: Image; overlay: Image): Image {....raises: [VipsError],
    tags: [], forbids: [].}

proc blendDifference(img: Image; overlay: Image): Image {....raises: [VipsError],
    tags: [], forbids: [].}

proc blendExclusion(img: Image; overlay: Image): Image {....raises: [VipsError],
    tags: [], forbids: [].}

proc blendLighten(img: Image; overlay: Image): Image {....raises: [VipsError],
    tags: [], forbids: [].}

proc blendMultiply(img: Image; overlay: Image): Image {....raises: [VipsError],
    tags: [], forbids: [].}

proc blendOver(img: Image; overlay: Image): Image {....raises: [VipsError],
    tags: [], forbids: [].}

proc blendOverlay(img: Image; overlay: Image): Image {....raises: [VipsError],
    tags: [], forbids: [].}

proc blendScreen(img: Image; overlay: Image): Image {....raises: [VipsError],
    tags: [], forbids: [].}

proc composite(img: Image; overlay: Image; mode: VipsBlendMode; x: int = 0;
               y: int = 0): Image {....raises: [VipsError], tags: [], forbids: [].}

proc composite(img: Image; overlays: openArray[Image];
               modes: openArray[VipsBlendMode]): Image {.
    ...raises: [ValueError, VipsError], tags: [], forbids: [].}

proc flatten(img: Image; background: openArray[cdouble] = @[0.0, 0.0, 0.0]): Image {.
    ...raises: [VipsError], tags: [], forbids: [].}

proc ifThenElse(condition, ifTrue, ifFalse: Image): Image {....raises: [VipsError],
    tags: [], forbids: [].}

proc premultiply(img: Image): Image {....raises: [VipsError], tags: [], forbids: [].}

proc recomb(img: Image; matrix: array[3, array[3, float]]): Image {.
    ...raises: [VipsError], tags: [], forbids: [].}

proc unpremultiply(img: Image): Image {....raises: [VipsError], tags: [],
                                        forbids: [].}