|
In this tutorial You will learn how to
create a texture of a rusty metallic surface
It will help you if you know about bumpmapping, layer masks and have read the tutorial on brushed metal |
|
|
First, create a new image, add 6 more layers, call them
plasma1, plasma2, plasma3, stain, rust brown, rust red and rust orange
It helps if you start with a picture twice as large as you intend to use it later After that use filter->render->clouds->plasma to render clouds in the 3 plasma layer, set 3 different turbulences (i used 1.0, 2.0, 3.0). Now your Layers, Channels & Paths window should look like this: |
|
| Your 3 plasma layers should look like this: |
Plasma 3
Plasma 2
Plasma 1
|
| Now it starts to get tricky. Activate the layer called "Plasma 1". Use the fuzzy selection tool (aka magic wand) to select a region that about spans the area you want to corrode. Hold the Shift-key to add more parts of the plasma cloud to the selection. You can also adjust the threshold of the fuzzy select tool in the dialogs->tool options... window (i use a threshold of 20 there) |
|
|
Activate the layer named "Stain" and use the fill tool
to fill the region with a grey tone.
Note that the color you fill the area may not be plain black - we will rely on this later I made the plasma layers invisible, because we are not really interested how they look |
|
|
Now we have determined the shape of our rust patch, now we will
make it look realistic by adding some colors.
Activate the layer called "Plasma 2" and choose the fuzzy select tool again. Select a Region that roughly covers the region You have filled in the "Stain" layer. The Selection may exceed the former, but should not completely cover it. Now Activate the layer named "Rust brown" and fill the selection with a brownish color. (It isn't important to choose a color very finicially - we will adjust the colors later) |
|
|
Now we want to restrain the brown parts of the rust to the areas
where the metal is stained.
Activate the "Stain" layer and click on layers->alpha to selection. Now activate the "Rust brown" layer again. click on select->grow and grow Your selection by 1 pixel. After that select->shrink the selection by 4 pixels. Then select->invert and edit->cut out what is not within the stain. Experiment a bit with the last 2 steps until you have a brown rust patch on the stain that does not leave too large gaps in between. |
|
|
Now do the same procedure for the "Rust red" layer using "Plasma 3"
and cut out what is beyond the "Rust brown" patch here.
This layer should emphasize the older parts of the whole rust patch and should therefore extend over the whole brown patch but should be considerably smaller. |
|
|
Again, repeat the last steps, now for "Rust orange" using "Plasma 3"
and reduce the threshold of the fuzzy select tool (i use a value of 12).
This layer will become the light flecks in the rust, it should not cover larger areas. |
|
|
Now we will create the metallic surface that will contain the rust.
Add a new layer on top of the others, filled with white. Then use
filters->noise->noisify, disable (uncheck) "independent" and
adjust the amount to about 0.70. After that image->alpha->threshold
alpha with a threshold of 0.
Call the new level "Metal"
Now use filters->blur->motion blur linear with a length of about 20 and an angle of about 45 to get a layer that looks like this (If this was too fast for you, have a look at the brushed metal tutorial) |
|
| Our next step will be to upraise the patch on the metal. Choose filters->map->bump map and play around with the settings until you like the result. |
|
| Now your metal surface should look like that: |
|
|
Now right-click on the "Metal" layer in the "Layers, Channels & Paths"
dialog, choose add layer mask and white (full opacity).
Select the layer called "Stain" and click in layers->alpha to selection. Reselect the layer mask of the "Metal" layer and fill your selection with black. Compare your Layer list to this: |
|
|
Now is the time to do some optimizations. Play around with image->colors->hue-saturation-value until you are satisfied with the colors. Additionally you can improve the "Stain" layer. I used layers->alpha to selection on the "Brown rust" layer, inverted the selection, intersected the selection (by clicking shift-ctrl while using the fuzzy select tool) with the "Stain" layer, shrinked the selection a bit and darkened the now selected parts of the "Stain" layer, but you can also use airbrush or dodge tool now. |
|
|
After having set the colors right, we will add a little more depth
to the rust.
Delete the plasma layers and make the "Metal" layer invisible.
Assure that all parts of the rust are visible, then use
layers->merge visible layers to create a composite layer
containing all the rust.
When your "Layers, Channels & Paths" look like this, it is time to filters->map->bump map the "Merged Rust" layer on itself. |
|
|
Now make the "Metal" layer visible again and use
image->colors->brightness-contrast on both until they
match in brightness, after that layers->flatten image
Your rust texture is now ready, and you can apply it to some structures by bumpmapping shapes onto it: |
|