help with anti aliasing

[Kommi]

I am trying to make a tile in photoshop and cannot seem to get rid of anti aliasing. What I wish to do is create a square and then rotate it 45% and skew a little. When I do this the edges are anti -aliased even when I un check the option. I am using the Rect Marquee tool. (Photoshop 7) Does anyone know how to get around this?

[Phil_The_Rodent]

You want to get *rid* of the anti-aliasing? Well [shrug] alright, if you think it's a good idea, try it in quick mask mode...

(a) Press Q to go into Quick mask mode
(b) Fill area with black
(c) Make your box selection and fill with white
(d) Free transform the white box as desired
(e) Go into adjust>levels
(f) Bring the white right down to touch the black
(g) Exit quick-mask mode
(h) Fill Selection

[Kommi]

I have tried but could not get it to work. The edgs of the box still blend with the white background. There must be a way to turn this off :(

Also what if I wish to use the lin tool to draw a shape. How o i turn the line tool's antialiasing off?

[Edited on 25-12-2002 by Kommi]

[Phil_The_Rodent]

When you closed the levels up, it should have pixellated right up (it did on my end on v6.0). Zoom in and check for me?

[Kommi]

a) Press Q to go into Quick mask mode
do I start a new layer or do this on he background layer?
(b) Fill area with black
When i do this I get a pink color in quick mask mode
(c) Make your box selection and fill with white
Ok that does work
(d) Free transform the white box as desired
I do but the original image is also drawn. So I have a white box and a white box rotated on top of it
(e) Go into adjust>levels

(f) Bring the white right down to touch the black
(g) Exit quick-mask mode

(h) Fill Selection
What do you mean by this?

[Phil_The_Rodent]

Okay, a little more in depth :)

Quick mask mode makes you affect a selection. Selections are drawn in red (by default) but painted in black and white. If you have a peek at your channels with quickmask on you'll see the quick mask there. It's a channel selection.

(a) So you go into this mode: it doesn't matter what you do it on. It could be on it's own layer or not. It doesn't really matter, as it's not affecting the layers, it's affecting a channel.

(b) You fill the layer with black (showing up as red), because I tried it and it doesn't work if the mask is inverted (black square on white). Plain and simple. The transform only works with white on black. White here is the selection. So when it is inverted, your next transformation would affect everything *but* what you had intended to select.

(c) Now you make your box with white (use the square marquee, make a square selection, and press Shift-Backspace to bring up the fill options). Remember this is all being down to the selection. Oops here's a thing. Deselect everything after you filled the box. That might be the issue.

(d) Now when you Ctrl-T to transform, you should be transforming the box. At this point, your transformation *will* be anti-aliased.

(e,f) Anti-aliasing adds a fine gradient between edges so that the transition is smooth. If you go into your levels dialogue in greyscale, you can effectively destroy this transition by reducing the number of levels available. Hence, drag the white all the way down. All those grey (or well, pink in this case) pixels will be destroyed, leaving you with a harshly pixellated edge.

(g) Exit quick mask mode. This will leave you with the selection you just made.

(h) Fill the selection with whatever colour you want.

[Elgreco]

Great tip Phil, I never tried that before, it worked great.

Pete

[Kommi]

I got it to work. Thanx a lot but it wont hpl my situation. Idealy, I would like to make a marquee selection on a trancparent surface and fill it with a render>clouds. I would then like to turn the tile 45% and not have there be any anti-aliasing. But I guess thats not possible :(

[Edited on 26-12-2002 by Kommi]

[Phil_The_Rodent]

Hmm. Let's try this a different way then. Use your original that you want un-anti-aliased, with your clouds modified and on their own layer and all anti-aliased and blended nicely. Ctrl-click the layer to load a selection. THEN:

(a) press Q to go into quickmask mode
(b) go into levels
(c) rather than adjust the white point down to the black, bring the black point right up to the white
(d) Press Ctrl-I to invert the selection
(e) Leave Quickmask mode
(f) Press delete to trim the anti-alias off

[Kommi]

Wow amazing, you got it! Thanx a lot!!

[Phil_The_Rodent]

You're absolutely welcome. Welcome to the café. :)