This tutorial is going to show you how to censor photos by making parts of the image which you want to censor pixelated. Obviously, this method could be used when you want to hide something in the photo.
Here's before / after comparison so you know where this is going.
So let's begin! 1) Load source photo into Adobe Photoshop using File > Open
Let's say we want to censor face of the man in front of the pic
2) Take Elliptical Marquee Tool, if it's not available directly on the toolbar, you might need to right click on other selection tool, like Rectangular Marquee Tool to access it (shortcut - key M)
3) Set Feather to 10 pixels. You may need to use more for larger scale pictures and selections.
4) Now using the mouse, select the area which you want to censor, in this case it's man's head. It doesn't have to be exact selection, just enough to cover the area you need censored.
5) Go to Filter > Pixelate > Mosaic
6) A new window pops up, where you can select Cell Size, you can use any value you want, you could say this is the amount of censorship in selected area. I will set Cell Size to 14 pixels. After you have found a perfect value hit OK.
7) Take Select > Deselect (or shortcut - Ctrl + D) and you're done.
That's it! This is one of the easiet things to do in Adobe Photoshop, so if you ever need to hide something, consider using this method. Of course you could just add a black square to the part which you want to hide, but that wouldn't look as good as it does now.