This is a very simple tutorial on how to create a grunged texture in GIMP. For this we’ll be using the fog renderer, bump mapping and some layer effects.
Let’s get started.
Step 1 – Start with a new, 800x600px white background image.
Step 2 – Let’s create some fog
Go to GIMP’s menu Filters -> Render -> Clouds and select Fog.
Set the fog color to #8c6929, turbulence to 1.1 and opacity to 100 as in the next image.
You will notice in the layers dialog, that a new layer called Clouds has been created.
You should have an image similar to this one.
Now repeat this step one more time but adjust the turbulence to 2.5, then duplicate this layer.
We have now an intermediary result with 3 fog layers (Cloud, Cloud #1 and Cloud #2) as follows:
Step 3 – Grungify the layers
Set the layer mode for Cloud #1 to Multiply and for Cloud #2 to Grain Merge.
Step 4 – Let’s add some scratches
Create a new transparent layer and named Scratches (or whatever).
With the pencil tool and pixel brush draw some white random lines and curves.
I did it like this:
Now go to GIMP menu Filters -> Blur and select Gaussian Blur. Set the blur radius to 4 or 5.
Go again to GIMP menu Filters -> Map and select Bump Map. Set the parameters as in the next picture. Set the bump map to Scratches layer.
After clicking OK set the layer mode to grain merge.
Step 5 – For greater effect let’s add a vignette effect.
Create a new layer an name it Vignette. With the ellipse select tool make an elliptical selection like this.
Invert the selection (CTRL + I) and from the GIMP menu Select -> Feather set the feather selection by 125 px.
Now fill the selection with black and set the layer opacity to 55%.
That’s it. Hope you liked it.
Download the tutorial’s GIMP file from here.