class Vips::Extend
When the edges of an image are extended, you can specify how you want the extension done. See {Image#embed}, {Image#conv}, {Image#affine} and so on.
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‘:black` new pixels are black, ie. all bits are zero.
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‘:copy` each new pixel takes the value of the nearest edge pixel
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‘:repeat` the image is tiled to fill the new area
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‘:mirror` the image is reflected and tiled to reduce hash edges
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‘:white` new pixels are white, ie. all bits are set
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‘:background` colour set from the @background property