class Vips::BlendMode
Blend mode to use when compositing images. See {Image#composite}.
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`:clear` where the second object is drawn, the first is removed
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`:source` the second object is drawn as if nothing were below
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`:over` the image shows what you would expect if you held two
semi-transparent slides on top of each other
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`:in` the first object is removed completely, the second is only
drawn where the first was
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`:out` the second is drawn only where the first isn't
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`:atop` this leaves the first object mostly intact, but mixes both
objects in the overlapping area
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`:dest` leaves the first object untouched, the second is discarded
completely
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`:dest_over` like `:over`, but swaps the arguments
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`:dest_in` like `:in`, but swaps the arguments
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`:dest_out` like `:out`, but swaps the arguments
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`:dest_atop` like `:atop`, but swaps the arguments
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`:xor` something like a difference operator
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`:add` a bit like adding the two images
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`:saturate` a bit like the darker of the two
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`:multiply` at least as dark as the darker of the two inputs
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`:screen` at least as light as the lighter of the inputs
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`:overlay` multiplies or screens colors, depending on the lightness
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`:darken` the darker of each component
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`:lighten` the lighter of each component
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`:colour_dodge` brighten first by a factor second
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`:colour_burn` darken first by a factor of second
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`:hard_light` multiply or screen, depending on lightness
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`:soft_light` darken or lighten, depending on lightness
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`:difference` difference of the two
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`:exclusion` somewhat like `:difference`, but lower-contrast