83 lines
1.7 KiB
Markdown
83 lines
1.7 KiB
Markdown
Resize
|
|
======
|
|
|
|
Image resizing for the [Go programming language](http://golang.org) that includes a few interpolation methods.
|
|
|
|
Installation
|
|
------------
|
|
|
|
```bash
|
|
$ go get github.com/nfnt/resize
|
|
```
|
|
|
|
It's that easy!
|
|
|
|
Usage
|
|
-----
|
|
|
|
Import package with
|
|
|
|
```go
|
|
import "github.com/nfnt/resize"
|
|
```
|
|
|
|
Resize creates a scaled image with new dimensions (`width`, `height`) using the interpolation function interp.
|
|
If either `width` or `height` is set to 0, it will be set to an aspect ratio preserving value.
|
|
|
|
```go
|
|
resize.Resize(width, height uint, img image.Image, interp resize.InterpolationFunction) image.Image, error
|
|
```
|
|
|
|
The provided interpolation functions are
|
|
|
|
- `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
|
|
|
|
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
|
|
// and preserve aspect ration
|
|
m := resize.Resize(1000, 0, 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>
|
|
Resize is released under an MIT style license.
|