go-resize/README.md

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Resize
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======
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Image resizing for the [Go programming language](http://golang.org) that includes a few interpolation methods.
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Installation
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------------
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```bash
$ go get github.com/nfnt/resize
```
It's that easy!
Usage
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-----
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Import package with
```go
import "github.com/nfnt/resize"
```
Resize creates a scaled image with new dimensions (w,h) using the interpolation function interp.
```go
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resize.Resize(w int, h int, img image.Image, interp resize.InterpolationFunction) image.Image
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```
The provided interpolation functions are
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- `NearestNeighbor`: [Nearest-neighbor interpolation](http://en.wikipedia.org/wiki/Nearest-neighbor_interpolation)
- `Bilinear`: [Bilinear interpolation](http://en.wikipedia.org/wiki/Bilinear_interpolation)
- `Bicubic`: [Bicubic interpolation](http://en.wikipedia.org/wiki/Bicubic_interpolation)
- `Lanczos3`: [Lanczos resampling](http://en.wikipedia.org/wiki/Lanczos_resampling) with a=3
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Sample usage:
```go
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)
}
```
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License
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-------
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Copyright (c) 2012 Jan Schlicht <janschlicht@gmail.com>
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Resize is released under an MIT style license.