Pixel Joint Forum: AAing without knowing what the background would be

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hi PJers .
i would like to know how to AA a pixel without having a specific background color. Usually i would use that sweet AA tool where you type the rgb values of the 2 colors u want to AA. 

Edited by spartan_117 - 25 November 2007 at 1:56am

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spartan_117 Commander Joined: 14 June 2007 Online Status: Offline Posts: 478	Topic: AAing without knowing what the background would be Posted: 25 November 2007 at 1:56am
	hi PJers . i would like to know how to AA a pixel without having a specific background color. Usually i would use that sweet AA tool where you type the rgb values of the 2 colors u want to AA. Edited by spartan_117 - 25 November 2007 at 1:56am
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surt Commander Joined: 30 December 2015 Online Status: Offline Posts: 413	Posted: 25 November 2007 at 2:10am
	If it's for a game, and the platform supports it, I'd say use alpha. If you have a general idea of the intensity range it'll be sitting on you can AA between the source intensity and the closest intensity or the mean intensity in the expected range. It won't always look great, but so long as the expected range isn't too great it should usually look okay. If you have no idea as to what it'll be sitting on then you can't AA as whatever you try has as much chance of increasing aliasing as decreasing it. Edited by surt - 25 November 2007 at 2:10am
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spartan_117 Commander Joined: 14 June 2007 Online Status: Offline Posts: 478	Posted: 25 November 2007 at 2:25am
	when u say alpha you mean like the alpha channel in photoshop. like using a 50% transparency with the pencil tool.
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surt Commander Joined: 30 December 2015 Online Status: Offline Posts: 413	Posted: 25 November 2007 at 2:26am
	Yep. Then it looks right whatever's behind it. Not for PJ though. PJ don't like no alpha. Edited by surt - 25 November 2007 at 2:27am
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spartan_117 Commander Joined: 14 June 2007 Online Status: Offline Posts: 478	Posted: 25 November 2007 at 2:30am
	which formats support multiple alpha data
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surt Commander Joined: 30 December 2015 Online Status: Offline Posts: 413	Posted: 25 November 2007 at 2:33am
	PNG, TIFF, others.
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Monkey 'o Doom Commander Joined: 24 September 2005 Online Status: Offline Posts: 2994	Posted: 25 November 2007 at 6:38am
	Also you could export the alpha channel as a separate greyscale image, allowing the image and alpha channel to be in pretty much any format, and just combine them when you're rendering (assuming that this IS for a game).
	RPG is numberwang.
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spartan_117 Commander Joined: 14 June 2007 Online Status: Offline Posts: 478	Posted: 25 November 2007 at 6:57am
	how do i do that in photoshop?
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Monkey 'o Doom Commander Joined: 24 September 2005 Online Status: Offline Posts: 2994	Posted: 25 November 2007 at 7:32am
	You could open the Channels window and from there turn off the channels you don't want visible, then take a screenshot of what's still displayed. There's probably a more streamlined and elegant way though; check the help file.
	RPG is numberwang.
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jalonso Admiral Joined: 29 November 2022 Online Status: Offline Posts: 13537	Posted: 28 November 2007 at 11:42am
	If you don't know the BG then if any AA is needed, AA inside or selout. If unknown AA is not to be used. Often times, correct lineart requires no AA at all. AA = operator error E: Feel free to flame me, I know better :p Edited by jalonso - 28 November 2007 at 11:42am
	PJs FAQ <•> Sticky Reads
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Doomcreator0 Commander Joined: 12 March 2017 Online Status: Offline Posts: 187	Posted: 29 November 2007 at 2:08pm
	Don't AA if it's transparent pixel art, only do it when you have a defined background.

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