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Posted on 06/04/06 09:49:53 AM |
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chris berry
Overhead Overlord Posts: 724 Reply  |
Grouping layers
Just completed Chapter 8 - it's all in the eyes. Placed the iris layer above the eyeball layer which means of course that you see the edge of the eyeball over the edge of the eyeball - so it looks like it's on top of it. The grouped these 2 layers and the iris slipped neatly inside the eyeball - just like a real eye. I did this successfully. My question is, how does it do this? It's amazing, but I want to how it works! |
Posted on 06/04/06 10:13:04 AM |
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maiden
Golden Gif Gagster Posts: 471 Reply  |
Re: Grouping layers
The way it works in Photoshop is that it takes the transparency information of the main layer and applies that to all the grouped layers above it. This is illustrated if you have a text layer as your main layer and then group a photograph layer above it, the photograph will appear cropped to the transparency of the lower layer appearing as if your picture has been cut up into letter shapes. As all pixels have a numeric binary value the binary value of zero, I believe, is allocated as transparent in Photoshop, so all Photoshop does when a layer is grouped to another layer is set the non-overlapping pixels of the grouped layer(s) to transparent (i.e. it switches their pixel value to zero effectively switching them off) |
Posted on 06/04/06 3:48:48 PM |
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chris berry
Overhead Overlord Posts: 724 Reply |
Re: Grouping layers
Great example using the letters/photo. Now I get it! |
Posted on 06/04/06 9:32:09 PM |
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Steve Mac
Grunge Genie Posts: 539 Reply  |
Re: Grouping layers
Maiden, I have to say, the examples you use to teach work so well. Even I got it! Thanks _________________ Steve Mac |