Second Life Forums Archive - Nice edging and those darned alpha channels

Katiana Palmerstone

Second Life Resident

Join date: 24 Oct 2004

Posts: 26

11-11-2004 12:45

Ok, I know everyone is sick of alpha channel Q's but this one is a bit different. As always when dealing with curved lines, I use anti-alias to achieve the nice edge. However, when I then put in the alpha channel, I get this horrendous white edge arround everything. I assume this is because the anti-alias varies opacity to get the nice edge. I've tried contracting the selection by one for the mask (I use PSP) but then I lose the clean edge. Does anyone have a solution for dealing with this? Thanks in advance!

Kat

Goodwrench Grayson

Classic Gaming Nut

Join date: 18 Jun 2004

Posts: 223

Maybe try this....

11-11-2004 15:41

You might want to see if you can set your "matte" (background color) to transparent before exporting the image. I don't use the same graphics software, but when I use Macromedia Fireworks, I have the option of doing that.

_____________________

We used to remember our Roots at The Mushroom Kingdom - memorial can be found at Davenport 200, 150
Section 8 Server - my home on the web

Apotheus Silverman

I write code.

Join date: 17 Nov 2003

Posts: 416

11-12-2004 08:34

From: Katiana Palmerstone

As always when dealing with curved lines, I use anti-alias to achieve the nice edge. However, when I then put in the alpha channel, I get this horrendous white edge arround everything.

This web page has a quite amazing tutorial on how to get rid of edge artifacts on transparencies, and it deals with the most difficult of them all... plants. The technique can apply to anything though, and produces wonderful results.

_____________________

Apotheus Silverman
Shop SL on the web - SLExchange.com

Visit Abbotts Aerodrome for gobs of flying fun.

Nicola Escher

512 by 512

Join date: 1 May 2003

Posts: 200

11-12-2004 10:42

The reason you're getting a white halo around the edges is because when an image is flattened for export the default background color is white. So the anti-aliased parts are matted against white which causes the halo. You can avoid this by creating background layer contain the color of your clothing/texture. See the tattoo section of my tutorial for an example. (link below)

_____________________

NicolaEscher.com
Tutorials, fashion, and photos.

Revidescent Delvecchio

indelible feeling

Join date: 10 Jul 2004

Posts: 41

11-14-2004 14:33

thanks so much, this had been bugging me on one skirt for awhile. no one knew what the problem was.

thank you sooo much

Nice edging and those darned alpha channels
Katiana Palmerstone Second Life Resident Join date: 24 Oct 2004 Posts: 26	11-11-2004 12:45 Ok, I know everyone is sick of alpha channel Q's but this one is a bit different. As always when dealing with curved lines, I use anti-alias to achieve the nice edge. However, when I then put in the alpha channel, I get this horrendous white edge arround everything. I assume this is because the anti-alias varies opacity to get the nice edge. I've tried contracting the selection by one for the mask (I use PSP) but then I lose the clean edge. Does anyone have a solution for dealing with this? Thanks in advance! Kat
Goodwrench Grayson Classic Gaming Nut Join date: 18 Jun 2004 Posts: 223	Maybe try this.... 11-11-2004 15:41 You might want to see if you can set your "matte" (background color) to transparent before exporting the image. I don't use the same graphics software, but when I use Macromedia Fireworks, I have the option of doing that. _____________________ We used to remember our Roots at The Mushroom Kingdom - memorial can be found at Davenport 200, 150 Section 8 Server - my home on the web
Apotheus Silverman I write code. Join date: 17 Nov 2003 Posts: 416	11-12-2004 08:34 From: Katiana Palmerstone As always when dealing with curved lines, I use anti-alias to achieve the nice edge. However, when I then put in the alpha channel, I get this horrendous white edge arround everything. This web page has a quite amazing tutorial on how to get rid of edge artifacts on transparencies, and it deals with the most difficult of them all... plants. The technique can apply to anything though, and produces wonderful results. _____________________ Apotheus Silverman Shop SL on the web - SLExchange.com Visit Abbotts Aerodrome for gobs of flying fun.
Nicola Escher 512 by 512 Join date: 1 May 2003 Posts: 200	11-12-2004 10:42 The reason you're getting a white halo around the edges is because when an image is flattened for export the default background color is white. So the anti-aliased parts are matted against white which causes the halo. You can avoid this by creating background layer contain the color of your clothing/texture. See the tattoo section of my tutorial for an example. (link below) _____________________ NicolaEscher.com Tutorials, fashion, and photos.
Revidescent Delvecchio indelible feeling Join date: 10 Jul 2004 Posts: 41	11-14-2004 14:33 thanks so much, this had been bugging me on one skirt for awhile. no one knew what the problem was. thank you sooo much

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Nice edging and those darned alpha channels