Grayscale image: Difference between revisions
Added Wren
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End Sub</lang>
=={{header|Wren}}==
{{libheader|DOME}}
This script converts the image [https://rosettacode.org/File:Lenna100.jpg Lenna100.jpg] to grayscale and then displays the two images side by side.
<lang ecmascript>import "graphics" for Canvas, Color, ImageData
import "dome" for Window
class PercentageDifference {
construct new(width, height, image1, image2) {
Window.title = "Grayscale Image"
Window.resize(width, height)
Canvas.resize(width, height)
_image1 = image1
_image2 = image2
_img1 = ImageData.loadFromFile(image1)
_img2 = ImageData.create(image2, _img1.width, _img1.height)
}
init() {
toGrayScale()
// 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)
}
toGrayScale() {
for (x in 0..._img1.width) {
for (y in 0..._img1.height) {
var c1 = _img1.pget(x, y)
var lumin = (0.2126 * c1.r + 0.7152 * c1.g + 0.0722 * c1.b).floor
var c2 = Color.rgb(lumin, lumin,lumin, c1.a)
_img2.pset(x, y, c2)
}
}
}
update() {}
draw(alpha) {}
}
var Game = PercentageDifference.new(1100, 550, "Lenna100.jpg", "Lenna-grayscale.jpg")</lang>
=={{header|Yabasic}}==
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