smartcrop

smartcrop finds good image crops for arbitrary sizes. It is a pure Go implementation, based on Jonas Wagner's smartcrop.js

Image: https://www.flickr.com/photos/usfwspacific/8182486789 CC BY U.S. Fish & Wildlife

Image: https://www.flickr.com/photos/endogamia/5682480447 by N. Feans

Installation

Make sure you have a working Go environment. See the install instructions.

To install smartcrop, simply run:

go get github.com/muesli/smartcrop

To compile it from source:

cd $GOPATH/src/github.com/muesli/smartcrop
go get -u -v
go build && go test -v

Example

package main

import (
        "fmt"
        "image"
        _ "image/png"
        "os"

        "github.com/muesli/smartcrop"
)

func main() {
        f, _ := os.Open("image.png")
        img, _, _ := image.Decode(f)

        analyzer := smartcrop.NewAnalyzer()
        topCrop, _ := analyzer.FindBestCrop(img, 250, 250)

        // The crop will have the requested aspect ratio, but you need to copy/scale it yourself
        fmt.Printf("Top crop: %+v\n", topCrop)

        type SubImager interface {
                SubImage(r image.Rectangle) image.Image
        }
        croppedimg := img.(SubImager).SubImage(topCrop)
        ...
}

Also see the test cases in crop_test.go for further working examples.

Sample Data

You can find a bunch of test images for the algorithm here.

Development

API docs can be found here.

Join us on IRC: irc.freenode.net/#smartcrop