colorcrop/example_test.go

// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package colorcrop_test

import (
	"image/color"
	"image/png"
	"log"
	"os"

	"github.com/nxshock/colorcrop"
)

func ExampleBasicUsage() {
	log.SetFlags(0)

	// Read source image
	sourceFile, _ := os.Open("img.png")
	defer sourceFile.Close()

	sourceImage, _ := png.Decode(sourceFile)

	// Crop white border with 50% thresold
	croppedImage := colorcrop.Crop(
		sourceImage,                    // for source image
		color.RGBA{255, 255, 255, 255}, // crop white border
		0.5) // with 50% thresold

	// Save cropped image
	croppedFile, _ := os.Create("cropped.png")
	defer croppedFile.Close()

	png.Encode(croppedFile, croppedImage)
}

func ExampleCustomComparator() {
	log.SetFlags(0)

	// Read source image
	sourceFile, _ := os.Open("img.png")
	defer sourceFile.Close()

	sourceImage, _ := png.Decode(sourceFile)

	// Crop white border with 50% thresold
	croppedImage := colorcrop.CropWithComparator(
		sourceImage,                    // for source image
		color.RGBA{255, 255, 255, 255}, // crop white border
		0.5,                // with 50% thresold
		colorcrop.CmpCIE76) // using CIE76 standart for defining color difference

	// Save cropped image
	croppedFile, _ := os.Create("cropped.png")
	defer croppedFile.Close()

	png.Encode(croppedFile, croppedImage)
}