class Vips::BlendMode

Blend mode to use when compositing images. See {Image#composite}.

• ‘:clear` where the second object is drawn, the first is removed

• ‘:source` the second object is drawn as if nothing were below

• ‘:over` the image shows what you would expect if you held two

  semi-transparent slides on top of each other

• ‘:in` the first object is removed completely, the second is only

  drawn where the first was
  

• ‘:out` the second is drawn only where the first isn’t

• ‘:atop` this leaves the first object mostly intact, but mixes both

  objects in the overlapping area

• ‘:dest` leaves the first object untouched, the second is discarded

  completely
  

• ‘:dest_over` like `:over`, but swaps the arguments

• ‘:dest_in` like `:in`, but swaps the arguments

• ‘:dest_out` like `:out`, but swaps the arguments

• ‘:dest_atop` like `:atop`, but swaps the arguments

• ‘:xor` something like a difference operator

• ‘:add` a bit like adding the two images

• ‘:saturate` a bit like the darker of the two

• ‘:multiply` at least as dark as the darker of the two inputs

• ‘:screen` at least as light as the lighter of the inputs

• ‘:overlay` multiplies or screens colors, depending on the lightness

• ‘:darken` the darker of each component

• ‘:lighten` the lighter of each component

• ‘:colour_dodge` brighten first by a factor second

• ‘:colour_burn` darken first by a factor of second

• ‘:hard_light` multiply or screen, depending on lightness

• ‘:soft_light` darken or lighten, depending on lightness

• ‘:difference` difference of the two

• ‘:exclusion` somewhat like `:difference`, but lower-contrast