Taming That AA pt.2
Let's tame the AA once more. Sometimes, when we resize stuff, we want to keep the aliasing of an image. Let's make-up a little scenario.
CLIENT: Hey, could you generate me a barcode image.
YOU: No problem, this will just take a minute. (You generate the barcode).
YOU: Here it is! What do you think?
CLIENT: It's too small, make it bigger.
YOU: Ok, just a sec... wait, there's no option to make it bigger in my generator!
CLIENT: Why don't you just resize it in Photoshop.
YOU: Ok, I'll try. (Then you try...)
... only to find this;

See how anti-aliasing ruined the barcode?
Awwww! How do you fix this? Actually, it is very easy, just follow me;
1) Open the image (of course!).
2) Go to Image > Mode > Indexed Color...
3) See my settings below, then click OK.

4) Resize the image.
Wow! Look how sharp it is!

CLIENT: Great job!
YOU: No sweat!
Other applications:
One other application I can think of it the resizing of game sprites. This is very helpful since you don't want to redraw the whole sprite animations just to resize it right?
Well, that's it, see ya!