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Originally Posted by yofloema
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no help for the outline ? arf i'm block with this, don't understand how keeping texture and hide outline.
do i use a new layer ?
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Here's what I do (now). I start with a line drawing and then use it as a basis for the alpha channel (or mask, depending on what your program calls it - I use GIMP) on each layer. Here's an example on a drop tank image:
The black and white thumbs to the right on 4 of the 6 layers is an alpha channel. (in this case, the alpha channel sets transparency). The thumbs on the left side illustrate the actual artwork. For this drop tank, I first drew the outline of the tank on white background, filled it in and reversed the colors (because black is transparent). I then copied that layer to each of the other layers so that all of the alpha channels would be exactly the same. If you look at the "texture" and "grunge" layers, you'll notice that they cover nearly the whole image. However, the use of an alpha channel makes certain parts (black) of the layer transparent!
Some layers, like the plumbing layer, did not get this alpha channel treatment since they are "one-off" layers.
To me, there are two main benefits of this technique:
1) All similar layers will have exactly the same transparency (or boundaries)
2) I don't have to paint within the lines!