Percentage difference between images: Difference between revisions
Percentage difference between images (view source)
Revision as of 11:14, 21 September 2016
, 7 years agoAdded Sidef
(Added Sidef) |
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Line 1,197:
produces:
<pre>difference: 1.62559%</pre>
=={{header|Sidef}}==
<lang ruby>require('Imager')
func img_diff(a, b) {
func from_file(name) {
%s|Imager|.new(file => name)
}
func size(img) {
(img.getwidth, img.getheight)
}
func pixel_diff(p1, p2) {
[p1.rgba] »-« [p2.rgba] -> map { .abs }.sum
}
func read_pixel(img, x, y) {
img.getpixel(x => x, y => y)
}
var(img1, img2) = (from_file(a), from_file(b))
var(w1, h1) = size(img1)
var(w2, h2) = size(img2)
if ((w1 != w2) || (h1 != h2)) {
return nil
}
var sum = 0
for y,x in (^h1 ~X ^w1) {
sum += pixel_diff(read_pixel(img1, x, y), read_pixel(img2, x, y))
}
sum / (w1 * h1 * 255 * 3)
}
say 100*img_diff('Lenna50.jpg', 'Lenna100.jpg')</lang>
{{out}}
<pre>
1.62559309816048815359477124183007
</pre>
=={{header|Tcl}}==
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