anchor.diff:  === Gauss filter
   --
   image::lena.png[title="original", width="300", height="200"]
  -image::GaussFilter5.png[title="mask 5x5 &#963=1.0", width="300", height="200"]
  -image::GaussFilter7.png[title="mask  &#963=4.0", width="300", height="200"]
  +image::GaussFilter5.png[title="mask 5x5 &#963;=1.0", width="300", height="200"]
  +image::GaussFilter7.png[title="mask 7x7 &#963;=4.0", width="300", height="200"]
   --
   === Emboss filter
   --
  
positive.code: image:lena.png[width="300", height="200"]
  image:GrayScaleFilter.png[width="300", height="200"]
  --
  === Sepia filter
  --
  image:lena.png[width="300", height="200"]
  image:SepiaFilter.png[width="300", height="200"]
  
negative.code: == Usage
  [.lead]
  --
  The way of applying filters is (on `SaltAndPepperFilter` example):
  
  [source,java]
  .code
  