Percentage difference between images: Difference between revisions

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=={{header|Wren}}==

{{trans|Kotlin}}

{{libheader|DOME}}

<lang ecmascript>import "graphics" for Canvas, Color, ImageData

import "dome" for Window

class PercentageDifference {

construct new(width, height, image1, image2) {

Window.title = "Perecentage difference between images"

Window.resize(width, height)

Canvas.resize(width, height)

_img1 = ImageData.loadFromFile(image1)

_img2 = ImageData.loadFromFile(image2)

// display images side by side

_img1.draw(0, 0)

_img2.draw(550, 0)

Canvas.print(image1, 200, 525, Color.white)

Canvas.print(image2, 750, 525, Color.white)

}

init() {

var dpc = (getDifferencePercent(_img1, _img2) * 1e5).round / 1e5

System.print("Percentage difference between images: %(dpc)\%")

}

getDifferencePercent(img1, img2) {

var width = img1.width

var height = img1.height

var width2 = img2.width

var height2 = img2.height

if (width != width2 || height != height2) {

var f = "(%(width), %(height)) vs. (%(width2), %(height2))"

Fiber.abort("Images must have the same dimensions: %(f)")

}

var diff = 0

for (y in 0...height) {

for (x in 0...width) {

diff = diff + pixelDiff(img1.pget(x, y), img2.pget(x, y))

}

}

var maxDiff = 3 * 255 * width * height

return 100 * diff / maxDiff

}

pixelDiff(c1, c2) { (c1.r - c2.r).abs + (c1.g - c2.g).abs + (c1.b - c2.b).abs }

update() {}

draw(alpha) {}

}

var Game = PercentageDifference.new(1100, 550, "Lenna50.jpg", "Lenna100.jpg")</lang>

{{out}}

<pre>

Percentage difference between images: 1.62607%