dither

package module

v0.0.0-...-2a6e115 Latest Latest Go to latest Published: Apr 26, 2018 License: MIT Imports: 2 Imported by: 7

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Repository

github.com/lestrrat-go/dither

Links

Open Source Insights

README ¶

dither

Apply dithering to an arbitrary image

This is a fork of https://github.com/esimov/dithergo

SYNOPSIS

func Example() {
  f, err := os.Open("file.png")
  if err != nil {
    return
  } 
  defer f.Close()
  
  img, _, err := image.Decode(f)
  if err != nil {
    return
  }

  ditheredImg := dither.Monochrome(dither.Burkes, img, 1.18)

  png.Encode(os.Stdout, ditheredImg)
}

Documentation ¶

Overview ¶

Example ¶

package main

import (
	"image"
	"image/png"
	"os"

	"github.com/lestrrat-go/dither"
)

func main() {
	f, err := os.Open("file.png")
	if err != nil {
		return
	}
	defer f.Close()

	img, _, err := image.Decode(f)
	if err != nil {
		return
	}

	ditheredImg := dither.Monochrome(dither.Burkes, img, 1.18)

	png.Encode(os.Stdout, ditheredImg)
}

Output:

Index ¶

Variables
func Color(m Matrixer, input image.Image, errorMultiplier float32) image.Image
func Grayscale(input image.Image) *image.Gray
func Monochrome(m Matrixer, input image.Image, errorMultiplier float32) image.Image
func Threshold(input *image.Gray) *image.Gray
type Filter
- func NewFilter(name string, m *Matrix) *Filter
- func (f *Filter) Matrix() *Matrix
- func (f *Filter) Name() string
type Matrix
- func NewMatrix(cols, rows int) *Matrix
type MatrixBuilder
- func NewMatrixBuilder(cols, rows int) *MatrixBuilder
- func (b *MatrixBuilder) AddRow(v []float32) *MatrixBuilder
- func (b *MatrixBuilder) Build() *Matrix
type Matrixer

Examples ¶

Package

Constants ¶

This section is empty.

Variables ¶

View Source

var Atkinson = NewFilter(
	"Atkinson",
	NewMatrixBuilder(5, 3).
		AddRow([]float32{0.0, 0.0, 1.0 / 8.0, 1.0 / 8.0}).
		AddRow([]float32{1.0 / 8.0, 1.0 / 8.0, 1.0 / 8.0, 0.0}).
		AddRow([]float32{0.0, 1.0 / 8.0, 0.0, 0.0}).
		Build(),
)

View Source

var Burkes = NewFilter(
	"Burkes",
	NewMatrixBuilder(5, 3).
		AddRow([]float32{0.0, 0.0, 0.0, 8.0 / 32.0, 4.0 / 32.0}).
		AddRow([]float32{2.0 / 32.0, 4.0 / 32.0, 8.0 / 32.0, 4.0 / 32.0, 2.0 / 32.0}).
		AddRow([]float32{0.0, 0.0, 0.0, 0.0, 0.0}).
		Build(),
)

View Source

var FloydSteinberg = NewFilter(
	"FloydSteinberg",
	NewMatrixBuilder(5, 3).
		AddRow([]float32{0.0, 0.0, 0.0, 7.0 / 48.0, 5.0 / 48.0}).
		AddRow([]float32{3.0 / 48.0, 5.0 / 48.0, 7.0 / 48.0, 5.0 / 48.0, 3.0 / 48.0}).
		AddRow([]float32{1.0 / 48.0, 3.0 / 48.0, 5.0 / 48.0, 3.0 / 48.0, 1.0 / 48.0}).
		Build(),
)

View Source

var Sierra2 = NewFilter(
	"Sierra-2",
	NewMatrixBuilder(5, 3).
		AddRow([]float32{0.0, 0.0, 0.0, 4.0 / 16.0, 3.0 / 16.0}).
		AddRow([]float32{1.0 / 16.0, 2.0 / 16.0, 3.0 / 16.0, 2.0 / 16.0, 1.0 / 16.0}).
		AddRow([]float32{0.0, 0.0, 0.0, 0.0, 0.0}).
		Build(),
)

View Source

var Sierra3 = NewFilter(
	"Sierra-3",
	NewMatrixBuilder(5, 3).
		AddRow([]float32{0.0, 0.0, 0.0, 5.0 / 32.0, 3.0 / 32.0}).
		AddRow([]float32{2.0 / 32.0, 4.0 / 32.0, 5.0 / 32.0, 4.0 / 32.0, 2.0 / 32.0}).
		AddRow([]float32{0.0, 2.0 / 32.0, 3.0 / 32.0, 2.0 / 32.0, 0.0}).
		Build(),
)

View Source

var SierraLite = NewFilter(
	"Sierra-Lite",
	NewMatrixBuilder(5, 3).
		AddRow([]float32{0.0, 0.0, 2.0 / 4.0}).
		AddRow([]float32{1.0 / 4.0, 1.0 / 4.0, 0.0}).
		AddRow([]float32{0.0, 0.0, 0.0}).
		Build(),
)

View Source

var Stucki = NewFilter(
	"Stucki",
	NewMatrixBuilder(5, 3).
		AddRow([]float32{0.0, 0.0, 0.0, 8.0 / 42.0, 4.0 / 42.0}).
		AddRow([]float32{2.0 / 42.0, 4.0 / 42.0, 8.0 / 42.0, 4.0 / 42.0, 2.0 / 42.0}).
		AddRow([]float32{1.0 / 42.0, 2.0 / 42.0, 4.0 / 42.0, 2.0 / 42.0, 1.0 / 42.0}).
		Build(),
)

Functions ¶

func Color ¶

func Color(m Matrixer, input image.Image, errorMultiplier float32) image.Image

func Grayscale ¶

func Grayscale(input image.Image) *image.Gray

func Monochrome ¶

func Monochrome(m Matrixer, input image.Image, errorMultiplier float32) image.Image

func Threshold ¶

func Threshold(input *image.Gray) *image.Gray

Types ¶

type Filter ¶

type Filter struct {
	// contains filtered or unexported fields
}

func NewFilter ¶

func NewFilter(name string, m *Matrix) *Filter

func (*Filter) Matrix ¶

func (f *Filter) Matrix() *Matrix

func (*Filter) Name ¶

func (f *Filter) Name() string

type Matrix ¶

type Matrix struct {
	// contains filtered or unexported fields
}

func NewMatrix ¶

func NewMatrix(cols, rows int) *Matrix

func (*Matrix) Cols ¶

func (m *Matrix) Cols() int

func (*Matrix) Get ¶

func (m *Matrix) Get(x, y int) float32

func (*Matrix) Rows ¶

func (m *Matrix) Rows() int

func (*Matrix) Set ¶

func (m *Matrix) Set(x, y int, v float32)

func (*Matrix) SetRow ¶

func (m *Matrix) SetRow(y int, v []float32) *Matrix

type MatrixBuilder ¶

type MatrixBuilder struct {
	// contains filtered or unexported fields
}

func NewMatrixBuilder ¶

func NewMatrixBuilder(cols, rows int) *MatrixBuilder

func (*MatrixBuilder) AddRow ¶

func (b *MatrixBuilder) AddRow(v []float32) *MatrixBuilder

func (*MatrixBuilder) Build ¶

func (b *MatrixBuilder) Build() *Matrix

type Matrixer ¶

type Matrixer interface {
	Matrix() *Matrix
}

Source Files ¶

View all Source files

Directories ¶

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