go-resize/README.md

Resize

Image resizing for the Go programming language that provides a few interpolation methods.

Installation

$ go get github.com/nfnt/resize

It's that easy!

Usage

Import package with

import "github.com/nfnt/resize"

Resize creates a scaled image with new dimensions (w,h) using the interpolation function interp.

resize.Resize(w int, h int, img image.Image, interp InterpolationFunction) image.Image 

The provided interpolation functions are

• NearestNeighbor: Nearest-neighbor interpolation
• Bilinear: Bilinear interpolation
• Bicubic: Bicubic interpolation
• Lanczos3: Lanczos resampling with a=3

Sample usage:

package main

import (
	"github.com/nfnt/resize"
	"image/jpeg"
	"os"
)

func main() {
	// open "test.jpg"
	file, err := os.Open("test.jpg")
	if err != nil {
		return
	}

	// decode jpeg into image.Image
	img, err := jpeg.Decode(file)
	if err != nil {
		return
	}
	file.Close()

	// resize to width 1000 using Lanczos resampling
	m := resize.Resize(1000, -1, img, resize.Lanczos3)

	out, err := os.Create("test_resized.jpg")
	if err != nil {
		return
	}
	defer out.Close()

	// write new image to file
	jpeg.Encode(out, m, nil)
}

License

Copyright (c) 2012 Jan Schlicht janschlicht@gmail.com This software is released unter the ISC license. The license text is at http://www.isc.org/software/license