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Old 03-30-2006, 03:08 AM   #1
Orc_Tamer
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Default Alpha Mapping

How To Alpha Skin In Photoshop
By Orc_Tamer


Alpha skinning is a technique used in Warcraft 3 to remove unnecessary parts from a model ex. a weapon. I will be using the texture of the hero "Demon Hunter".

One thing I have to point out is that some models part cannot be alpha out because their team color gets in the way ex. Blademaster's Flag. Just check if it works for your model.


Open up your skin/texture and go to Window > Channels




A new window will appear and will have RGB, Red, Green, Blue




Go to the bottom of the window and look for the icon that says "Create New Channel". A new layer called "Alpha 1" will appear.



Now here comes the fun part. :)

Select all you layers and make them visible (click the box with the eye). You should have your image all red, don't worry about that just ignore that. Select your Alpha Layer and start to edit your skin.

Black = Remove
White = Add

When your finished with your skin you should have something like this.


After that just convert it into .blp and import it to your map and change the path to fit your character.



Here are my results:


Have fun Alpha Skinning!

- Orc_Tamer
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Old 03-30-2006, 10:53 AM   #2
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what also works in photoshop, is the ERASER tool. Just make any part you want alphaed colorless and WHAM its gone. So much easyer then fudging with alpha channels -_-

allthough i do approve this tut, its usefull, i heard some photoshop versions do not support the eraser-alphaing.
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Old 05-07-2006, 03:54 PM   #3
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This is very useful to me, thnx xD

Last edited by Oliver : 05-07-2006 at 06:29 PM.
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Old 07-27-2006, 01:46 PM   #4
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yeah, I had use of this tut 'cause my ps won't let me save .tga with transparency
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Old 09-28-2006, 01:46 PM   #5
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is it possible to do lil' transparent texture - if I want to do something crystal?
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Old 10-05-2006, 10:02 AM   #6
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ive been playing round in photoshop CS2 and i cant remove parts ...
i do it all properly but what i paint in black on the alpha1 channel doesnt dissapear. i used different opacities of black and i only get the team colour where i want the part to dissapear
any ideas?
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Old 10-19-2006, 07:03 PM   #7
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What you're trying to make transparent(alpha erase) is probably covered by a team color. Also note that the alpha channel is either black or white in places, nothing else.
Look on the model for where it's teamcolored.
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Old 07-17-2007, 11:00 PM   #8
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do you just do this in like a normal photo shop ? and how do u get the textures to photo shop srry sometimes im just slow so..... thank you for the anwser
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Old 11-26-2007, 04:16 AM   #9
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ya so i was making a skin in photoshop and i saved it as a tga, then i went in and copy my alpha channel from PS to the tga file and saved it. after importing the new blp i made using image extractor it came out looking transparent where the team color should be anyone know how to fix this?
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Old 11-26-2007, 12:29 PM   #10
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Quote:
Originally Posted by Amdor
is it possible to do lil' transparent texture - if I want to do something crystal?
Depends on the model. The wc3 engine does support 8-bit alpha materials (8 shades of transparancy), but it is normally used to cover areas with teamcolor, allmost never solo.

To get a proper ghostly effect like you want you have to change the material to something like additive reather then alphaing it though.

Howevere you look at it, you'll have to do a model edit.

Quote:
Originally Posted by pantsonnos
ive been playing round in photoshop CS2 and i cant remove parts ...
i do it all properly but what i paint in black on the alpha1 channel doesnt dissapear. i used different opacities of black and i only get the team colour where i want the part to dissapear
any ideas?
cheers
Pantsonnos

(email me or get me on msn @ pantsonnos@yahoo.com.au if possible)
Make sure you are working on a TGA file, and save as a TGA file.

Quote:
Originally Posted by dafatalgigabyte
What you're trying to make transparent(alpha erase) is probably covered by a team color. Also note that the alpha channel is either black or white in places, nothing else.Look on the model for where it's teamcolored.
This is wrong. Like i mentioned before, teamcolored parts are usually covered by an 8-bit alpha material so that the teamcolor areas can be textured properly. So there are areas that support grey alpha-ing. Where it doesnt you can still use grey values if you want, but it'll just pick whats closest: black or white (invisble or visible) in game.

Quote:
Originally Posted by Snipeman101
do you just do this in like a normal photo shop ? and how do u get the textures to photo shop srry sometimes im just slow so..... thank you for the anwser
You export them from wc3 (always save as TGA!) using a program. I prefer wc3vieuwer, it can be found in our recources -> tools section.

Quote:
Originally Posted by Medevil_Nuke
ya so i was making a skin in photoshop and i saved it as a tga, then i went in and copy my alpha channel from PS to the tga file and saved it. after importing the new blp i made using image extractor it came out looking transparent where the team color should be anyone know how to fix this?
Not all bits of a model have teamcolor underneath them. It may verry well be that you alphaed bits in an area that doesnt have teamcolor at all.

And just a note to everyone: Some bits of a model simply can not be alpha-ed. They dont have teamcolor, and they dont support the alpha channel.
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Old 01-06-2008, 11:19 PM   #11
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does it work on gimp?
cuz i tried and it did nothing though i might have done it wrong. could you make a more discriptive tutorial?

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Old 08-19-2009, 12:26 AM   #12
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Does anyone know about a problem that makes the skin transparent ingame without having even touched the alpha channels?
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