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filter.go
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filter.go
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package dither
type Filter struct {
Name string
Matrix [][]float32
}
func NewFilter(name string, matrix [][]float32) *Filter {
return &Filter{
Name: name,
Matrix: matrix,
}
}
var FloydSteinberg = NewFilter(
"floydSteinberg",
[][]float32{
[]float32{0.0, 0.0, 0.0, 7.0 / 48.0, 5.0 / 48.0},
[]float32{3.0 / 48.0, 5.0 / 48.0, 7.0 / 48.0, 5.0 / 48.0, 3.0 / 48.0},
[]float32{1.0 / 48.0, 3.0 / 48.0, 5.0 / 48.0, 3.0 / 48.0, 1.0 / 48.0},
},
)
var Burkes = NewFilter(
"burkes",
[][]float32{
{0.0, 0.0, 0.0, 8.0 / 32.0, 4.0 / 32.0},
{2.0 / 32.0, 4.0 / 32.0, 8.0 / 32.0, 4.0 / 32.0, 2.0 / 32.0},
{0.0, 0.0, 0.0, 0.0, 0.0},
},
)
var SierraLite = NewFilter(
"sirra",
[][]float32{
{0.0, 0.0, 2.0 / 4.0},
{1.0 / 4.0, 1.0 / 4.0, 0.0},
{0.0, 0.0, 0.0},
},
)
var Sierra2 = NewFilter(
"sierra2",
[][]float32{
{0.0, 0.0, 0.0, 4.0 / 16.0, 3.0 / 16.0},
{1.0 / 16.0, 2.0 / 16.0, 3.0 / 16.0, 2.0 / 16.0, 1.0 / 16.0},
{0.0, 0.0, 0.0, 0.0, 0.0},
},
)
var Sierra3 = NewFilter(
"sierra3",
[][]float32{
{0.0, 0.0, 0.0, 5.0 / 32.0, 3.0 / 32.0},
{2.0 / 32.0, 4.0 / 32.0, 5.0 / 32.0, 4.0 / 32.0, 2.0 / 32.0},
{0.0, 2.0 / 32.0, 3.0 / 32.0, 2.0 / 32.0, 0.0},
},
)
var Stucki = NewFilter(
"stucki",
[][]float32{
{0.0, 0.0, 0.0, 8.0 / 42.0, 4.0 / 42.0},
{2.0 / 42.0, 4.0 / 42.0, 8.0 / 42.0, 4.0 / 42.0, 2.0 / 42.0},
{1.0 / 42.0, 2.0 / 42.0, 4.0 / 42.0, 2.0 / 42.0, 1.0 / 42.0},
},
)
var Atkinson = NewFilter(
"atkinson",
[][]float32{
{0.0, 0.0, 1.0 / 8.0, 1.0 / 8.0},
{1.0 / 8.0, 1.0 / 8.0, 1.0 / 8.0, 0.0},
{0.0, 1.0 / 8.0, 0.0, 0.0},
},
)