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Percentage difference between images: Difference between revisions
Percentage difference between images (view source)
Revision as of 19:20, 15 March 2021
, 3 years ago→{{header|Nim}}
Line 1,088:
format "Diff: %\%\n" (totalDiff / ((img1.width * img1.height * 3) as float) * 100)
)</lang>
=={{header|Nim}}==
{{libheader|imageman}}
We use the procedure <code>loadImage</code> which sets default values for JPEG decoding parameters. With these parameters, the difference between the images is about 1.7747 %. Using the less convenient procedure <code>readImage</code> which works on an open file, it is possible to change the parameters in order to get the smaller difference of 1.6256 %.
<lang Nim>import strformat
import imageman
var img50, img100: Image[ColorRGBU]
try:
img50 = loadImage[ColorRGBU]("Lenna50.jpg")
img100 = loadImage[ColorRGBU]("Lenna100.jpg")
except IOError:
echo getCurrentExceptionMsg()
quit QuitFailure
let width = img50.width
let height = img50.height
if img100.width != width or img100.height != height:
quit "Images have different sizes.", QuitFailure
var sum = 0
for x in 0..<height:
for y in 0..<width:
let color1 = img50[x, y]
let color2 = img100[x, y]
for i in 0..2:
sum += abs(color1[i].int - color2[i].int)
echo &"Image difference: {sum * 100 / (width * height * 3 * 255):.4f} %"</lang>
{{out}}
<pre>Image difference: 1.7747 %</pre>
=={{header|OCaml}}==
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