How to pixelate/blur an image using ImageMagick?

Question

I want to pixelate and/or blur an image. I've found the command for the blurring:

$convert image.jpg -blur 18,5 newimage.jpg

to work but I cannot blur the image any more. And how do I pixelate the image? I couldn't find a sound example around the net.

Thx

Answer 1

I don't know anything about ImageMagick, but you can try resizing the image using bicubic to a much smaller dimension, then resizing the image back to a bigger one.

The trick works using .net's System.Drawing object.

Answer 2

This worked nicely for me, gives a sort of cross between pixelating and blurring:

convert -resize 10% image.jpg newimage.jpg
convert -resize 1000% newimage.jpg newimage.jpg

You can be sure that the data cannot be retrieved, should that be important to you.

Changing the %ages will change the amount of pixelation/blur

Answer 3

To get a proper square pixellation, try:

convert -scale 10% -scale 1000% original.jpg pixelated.jpg