enhance

README

enhance

Package enhance is a Go implementation for enhancing photographs (adjusting brightness, contrast, etc.)

This project aims to reproduce https://github.com/yuki-koyama/enhancer.

Usage

package main

import (
	"image"
	"image/jpeg"
	"log"
	"os"

	"changkun.de/x/enhance"
)

func main() {
	f, err := os.Open("testdata/1.jpg")
	if err != nil {
		log.Fatal(err)
	}
	defer f.Close()

	img, err := jpeg.Decode(f)
	if err != nil {
		log.Fatal(err)
	}

	enhanced := enhance.Image(img, enhance.Params{
		Brightness:  .5,
		Contrast:    .5,
		Saturation:  .5,
		Temperature: .5,
		Tint:        .5,
	})

	f, err = os.Create("testdata/enhanced.jpg")
	if err != nil {
		log.Fatal(err)
	}
	defer f.Close()

	if err := jpeg.Encode(f, enhanced, nil); err != nil {
		log.Fatal(err)
	}
}

License

MIT

Documentation

Overview

Package enhance provides image enhancement algorithms for adjusting brightness, contrast, saturation, temperature, and tint.

Index

• func Image(img image.Image, params Params) *image.RGBA
• type Color
  • func NewColor(c color.RGBA) Color
  • func Pixel(p Color, params Params) Color
  • func (c Color) ToRGBA() color.RGBA
• type Params

Examples

• Image

Functions

func Image

func Image(img image.Image, params Params) *image.RGBA

Image enhances a given image.Image and returns a new image.RGBA.

This method reproduces https://github.com/yuki-koyama/enhancer.

Example

package main

import (
	"image/jpeg"
	"log"
	"os"

	"changkun.de/x/enhance"
)

func main() {
	f, err := os.Open("testdata/1.jpg")
	if err != nil {
		log.Fatal(err)
	}
	defer f.Close()

	img, err := jpeg.Decode(f)
	if err != nil {
		log.Fatal(err)
	}

	enhanced := enhance.Image(img, enhance.Params{
		Brightness:  .5,
		Contrast:    .5,
		Saturation:  .5,
		Temperature: .5,
		Tint:        .5,
	})
	f, err = os.Create("testdata/enhanced.jpg")
	if err != nil {
		log.Fatal(err)
	}
	defer f.Close()

	if err := jpeg.Encode(f, enhanced, nil); err != nil {
		log.Fatal(err)
	}

}

Types

type Color

type Color struct {
	R, G, B float64
}

Color RGB from 0 to 1.

func NewColor

func NewColor(c color.RGBA) Color

func Pixel

func Pixel(p Color, params Params) Color

Pixel changes the color of a pixel based on the given parameters.

func (Color) ToRGBA

func (c Color) ToRGBA() color.RGBA

type Params

type Params struct {
	Brightness  float64 `json:"brightness"`
	Contrast    float64 `json:"contrast"`
	Saturation  float64 `json:"saturation"`
	Temperature float64 `json:"temperature"`
	Tint        float64 `json:"tint"`
}

Params defines the parameters for image enhancement. The values should in range [0, 1].