halftone

README

go-haftone

This repository contains a implemenation of "digital halftoning" algorithm written in go.

Halftone is the reprographic technique that simulates continuous-tone imagery through the use of dots, varying either in size or in spacing, This technique is used by the printer to convert digital image (see more here)

usage

Type go run cmd/haftone.go --help to check the option supported.

Usage:
			go run <image>
Options:
  -method string
    name of the filters to apply, options: 'bayer', 'bayer2', 'bayer4' (default bayer2)
  -output string
		Directory name, where to save the generated images (default "output")`

example

example of result:

Filter	Input	Output
bayer
bayer2
bayer4

Documentation

Index

• Variables
• func Halftone(img image.Image, filter Filter) image.Image
• type Filter
  • func (f Filter) Max() int32
  • func (f Filter) Min() int32

Variables

var Bayer = newFilter(
	"bayer",
	[][]int32{
		[]int32{0, 2},
		[]int32{3, 1},
	},
)

var Bayer2 = newFilter(
	"bayer2",
	[][]int32{
		[]int32{0, 8, 2, 10},
		[]int32{12, 4, 14, 6},
		[]int32{3, 11, 1, 9},
		[]int32{15, 7, 13, 5},
	},
)

var Bayer4 = newFilter(
	"bayer4",
	[][]int32{
		[]int32{0, 48, 12, 60, 3, 61, 15, 63},
		[]int32{32, 16, 44, 28, 35, 19, 47, 21},
		[]int32{8, 56, 4, 52, 11, 59, 7, 55},
		{40, 24, 36, 20, 43, 27, 39, 23},
		{2, 50, 14, 62, 1, 49, 13, 61},
		{34, 18, 46, 30, 33, 17, 45, 29},
		{10, 58, 6, 54, 9, 57, 5, 53},
		{42, 26, 38, 22, 41, 25, 37, 21},
	},
)

Functions

func Halftone

func Halftone(img image.Image, filter Filter) image.Image

Types

type Filter

type Filter struct {
	Name   string
	Matrix [][]int32
}

func (Filter) Max

func (f Filter) Max() int32

func (Filter) Min

func (f Filter) Min() int32