quantize

Documentation

Overview

Package quantize offers an implementation of the draw.Quantize interface using an optimized Median Cut method, including advanced functionality for fine-grained control of color priority

Index

• type AggregationType
• type MedianCutQuantizer
  • func (q MedianCutQuantizer) Quantize(p color.Palette, m image.Image) color.Palette

Examples

• MedianCutQuantizer

Types

type AggregationType

type AggregationType uint8

AggregationType specifies the type of aggregation to be done

const (
	// Mode - pick the highest priority value
	Mode AggregationType = iota
	// Mean - weighted average all values
	Mean
)

type MedianCutQuantizer

type MedianCutQuantizer struct {
	// The type of aggregation to be used to find final colors
	Aggregation AggregationType
	// The weighting function to use on each pixel
	Weighting func(image.Image, int, int) uint32
	// Whether to create a transparent entry
	AddTransparent bool
}

MedianCutQuantizer implements the go draw.Quantizer interface using the Median Cut method

Example

file, err := os.Open("test_image.jpg")
if err != nil {
	fmt.Println("Couldn't open test file")
	return
}
i, _, err := image.Decode(file)
if err != nil {
	fmt.Println("Couldn't decode test file")
	return
}
q := MedianCutQuantizer{}
p := q.Quantize(make([]color.Color, 0, 256), i)
fmt.Println(p)

func (MedianCutQuantizer) Quantize

func (q MedianCutQuantizer) Quantize(p color.Palette, m image.Image) color.Palette

Quantize quantizes an image to a palette and returns the palette