Disable Anti-Aliasing in CS 2?

P
Posted By
pndalal
Mar 2, 2006
Views
1481
Replies
7
Status
Closed
How can I disable anti-aliasing in Photoshop CS 2? It seems that any time I have jagged edges in a layer, it automatically anti-aliases them. How do I disable this blending option? I’m assuming it’s a blending option because when I change the color of the background layer, the anti-alias changes as well. I’ve gone to blending options for the layer but I can’t find anything which toggles anti-alias? Help would be appreciated… And in case you want to know the specifics of what I’m trying to do, I’ve included a description below —

I have a square image that I want to rotate. If I select the image using the rectangular marquee tool and right-click –> free transform and then rotate the image to -45 degrees and apply the transformation, Photoshop rotates the image perfectly and it looks great. The problem is, I do not want Photoshop to add semi-transparent pixels on the edges of the rotated pic. I do not want anti-aliasing at all! How?

Thanks in advance,
Dalal
Related Tags
anti-aliasing disable

How to Improve Photoshop Performance

Learn how to optimize Photoshop for maximum speed, troubleshoot common issues, and keep your projects organized so that you can work faster than ever before!

P
pndalal
Mar 2, 2006
Another thing. I read that if you go to preferences, and select Nearest Neighbor for image interpolation, it disables anti-alias, but whenever I rotate that ‘square image’ of mine, the inside of the square, the texture, it kind of becomes distorted. I liked how the texture looked when I had bicubic ON. Now, it looks all weird.

So I need a way to preserve the smooth rotation while disabling anti-aliasing on the outer edges! Any help would be appreciated!

Thanks,
Dalal
T
Tacit
Mar 2, 2006
In article ,
wrote:

I have a square image that I want to rotate. If I select the image using the rectangular marquee tool and right-click –> free transform and then rotate the image to -45 degrees and apply the transformation, Photoshop rotates the image perfectly and it looks great. The problem is, I do not want Photoshop to add semi-transparent pixels on the edges of the rotated pic. I do not want anti-aliasing at all!

Good luck on that.

When you rotate a selection, Photoshop does not rotate the pixels. That is not possible. Instead, Photoshop must compute new pixels using whatever interpolation method you have selected in Preferences.

If you use Nearest Neighbor interpolation, there will be none of what you are calling "anti-aliasing." Problem is, any detail in the area you rotate will turn out jaggy and awful as well.

Can you explain more about what you are doing? Why is this anti-aliasing a problem? Are you trying to save the image for the Web, and that’s the reason you do not want antialiasing?

—
Art, photography, shareware, polyamory, literature, kink: all at http://www.xeromag.com/franklin.html
Nanohazard, Geek shirts, and more: http://www.villaintees.com
T
Tacit
Mar 2, 2006
In article ,
wrote:

So I need a way to preserve the smooth rotation while disabling anti-aliasing on the outer edges! Any help would be appreciated!

You need to understand what happens when you rotate the image.

Photoshop interpolates the entire image. It is this interpolation that is creating the translucent pixels you are misidentifying as "anti-aliasing." Photoshop creates a new square, and the mathematical result it returns for the edges of the square are a combination of the values of the original square (color) and the values of the outside edges of the square (transparent).

If you can explain why you need to get rid of the translucent pixels on the edge of the square, we can tell you how to do this. For example, if you are saving the image for the Web as a transparent GIF, you get rid of the translucent pixels on the edge by setting the "matte color" to "None" in the Save for Web dialog.

—
Art, photography, shareware, polyamory, literature, kink: all at http://www.xeromag.com/franklin.html
Nanohazard, Geek shirts, and more: http://www.villaintees.com
P
pndalal
Mar 3, 2006
Thanks for your replies guys!

Okay, so the transculent pixels are NOT anti-aliased edges. They are just part of the bicubic interpolation process, I understand…

What I’m doing here with Photoshop is creating graphics for a computer game I’m designing. Specifically, it’s a platform game, you know, like Super Mario World or something. So I’ve made platforms for my game in Photoshop and they look awesome! Now, I need 45 degree platforms, 30 degree platforms, and 10 degree platforms, so I want to rotate the image of the flat horizontal platform. It’s possible for me to import PNG’s with Alpha Transparency into my game, but that’ll be tough and inefficient, AND the worst thing could be that the game will run much slower. I need the object to contain no Alpha Transparency, but have completely opaque regions and completely transparent regions. So, I need the edges of the images to be either completely opaque or transparent. No semi-transparency at all.

In other words, if Photoshop is doing the bicubic interpolation and it finds that it needs to put a pixel on TOP of a transparent pixel, then it should just leave the transparent pixel be! That’s what I want!

So, that’s what I want to do. Hope you guys can help!

Thanks,
Dalal
NS
Nicholas Sherlock
Mar 3, 2006
wrote:
[…]
I need the object to contain no Alpha Transparency, but have completely opaque regions and completely transparent regions. So, I need the edges of the images to be either completely opaque or transparent. No semi-transparency at all.

Saving as GIF or PNG 8-bit with Save To Web allows you to set up what happens when semi-transparent elements are altered to produce the final, binary (Transparent or opaque) transparency. You probably want to disable dithering for transparency and set Matte to None.

Cheers,
Nicholas Sherlock
N
noone
Mar 3, 2006
In article ,
says…
Thanks for your replies guys!

Okay, so the transculent pixels are NOT anti-aliased edges. They are just part of the bicubic interpolation process, I understand…
What I’m doing here with Photoshop is creating graphics for a computer game I’m designing. Specifically, it’s a platform game, you know, like Super Mario World or something. So I’ve made platforms for my game in Photoshop and they look awesome! Now, I need 45 degree platforms, 30 degree platforms, and 10 degree platforms, so I want to rotate the image of the flat horizontal platform. It’s possible for me to import PNG’s with Alpha Transparency into my game, but that’ll be tough and inefficient, AND the worst thing could be that the game will run much slower. I need the object to contain no Alpha Transparency, but have completely opaque regions and completely transparent regions. So, I need the edges of the images to be either completely opaque or transparent. No semi-transparency at all.

In other words, if Photoshop is doing the bicubic interpolation and it finds that it needs to put a pixel on TOP of a transparent pixel, then it should just leave the transparent pixel be! That’s what I want!
So, that’s what I want to do. Hope you guys can help!

Thanks,
Dalal

Unless I am missing something here, it would seem that it would be better to create the background shapes (platforms) in vector. This would allow all sorts of angular manipulation without the interpolation. You would, however, need to then rasterize these shapes, which will yield "jaggies," but they should be clean jaggies, either transparent, or filled, not partially-filled. If I am way off-base here, I hope that Tacit, or Nicholas will correct me.

Hunt
T
Tacit
Mar 4, 2006
In article ,
wrote:

I need the object to contain no Alpha Transparency, but have completely opaque regions and completely transparent regions. So, I need the edges of the images to be either completely opaque or transparent. No semi-transparency at all.

Save the image as a transparent GIF using Save for Web. In the Safe for Web dialog, choose a "matte color" of "NONE". That will make the GIF non-anti-aliased.

—
Art, photography, shareware, polyamory, literature, kink: all at http://www.xeromag.com/franklin.html
Nanohazard, Geek shirts, and more: http://www.villaintees.com

Master Retouching Hair

Learn how to rescue details, remove flyaways, add volume, and enhance the definition of hair in any photo. We break down every tool and technique in Photoshop to get picture-perfect hair, every time.

Related Discussion Topics

Nice and short text about related topics in discussion sections