I want to make stained glass windows...
I can make a bitmap file of the " glass & lead " and a second bitmap of the transparency I need on it's alpha channel.
I can import the files into photoshop, how do I bring the second file in as the mask for the alpa channel ????
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How to inport an alfa channel mask ? |
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Jonathan Morris
Registered User
Join date: 5 Jan 2006
Posts: 66
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02-08-2006 00:08
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Robin Sojourner
Registered User
Join date: 16 Sep 2004
Posts: 1,080
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02-08-2006 05:03
Hi!
You don't need a mask on the alpha channel. In fact, you can't make masks for alpha channels. All you need is the Alpha Channel itself. So, this is what to do. 1. Open both images in Photoshop. We'll call them Glass and Alpha. 2. Select All of the Alpha image (Command/ctrl +A) and copy it. 3. Click on the Glass image to make it active. 4. Click on the Channels Palette tab, to open the Palette. 5. Click on the Create New Channel icon, at the bottom of the Palette. (It looks like a blank piece of paper, with one corner turned up. In CS2, it's the second from the right.) 6. Paste (Command/ctrl +V) 7. Click on the RGB thumbnail, to return to viewing the RGB channels. 8. Save as a Targa file, and choose 32 bit when you get the chance. 9. Import the file into SL. That's it, step by step! Hope this helps! _____________________
Robin (Sojourner) Wood
www.robinwood.com "Second Life ... is an Internet-based virtual world ... and a libertarian anarchy..." Wikipedia |
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Ceera Murakami
Texture Artist / Builder
Join date: 9 Sep 2005
Posts: 7,750
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02-08-2006 07:48
Some advice from someone else who has recently done leaded-glass windows:
When you do the bitmaps for the visible part of the leaded glass, do them 2x as large as you intend to use, and do not do anti-aliasing. Create your aplha chanel as in the description above. Then reduce the image size to your desired size just before saving to targa format. (I work at 1024 x 1024, and reduce to 512 x 512). What this does is greatly reduce the 'fuzziness' and 'white edges' that often appears at the edges of an alpha-mapped area. That fuzziness is caused by the anti-aliasing, which creates pixels at the edge that are neither transparent nor opaque. Making it larger and non-aliased and then reducing it smooths your edges much nicer. |