contrast

Documentation

Overview

Package contrast implements functions to adjust the contrast of an image.

Index

• Constants
• func Adjust(img image.Image, value float64) image.Image
• func AdjustC(value float64) utils.Composable
• func Linear(img image.Image, value float64) image.Image
• func LinearC(value float64) utils.Composable
• func Sigmoidal(img image.Image, factor, midpoint float64) image.Image
• func SigmoidalC(factor, midpoint float64) utils.Composable

Constants

const Epsilon = 1.0e-10

Functions

func Adjust

func Adjust(img image.Image, value float64) image.Image

Adjust changes the contrast in the Image. A value of 0 has no effect.

func AdjustC

func AdjustC(value float64) utils.Composable

func Linear

func Linear(img image.Image, value float64) image.Image

Linear adjusts the contrast using a linear function. A value of 1 has no effect, and a value of 0 will return a grey image.

func LinearC

func LinearC(value float64) utils.Composable

func Sigmoidal

func Sigmoidal(img image.Image, factor, midpoint float64) image.Image

Sigmoidal adjusts the contrast in a non-linear way. Factor sets how much to increase the contrast, midpoint sets where midtones fall in the resultant image.

func SigmoidalC

func SigmoidalC(factor, midpoint float64) utils.Composable