Gimp tutorial: How to create a grunged background/texture

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 1 - 800x600 px with white background

Step 1 - 800x600 px with white background

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.

Fog parameters

Fog parameters


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.
Step 2 - Intermediary result with first fog layer

Step 2 - Intermediary result



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 2 - Itermediary result with all fog layers

Step 2 - Itermediary result with all fog layers

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:

Step 4 - Scratches to be

Step 4 - Scratches to be


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.
Step 4 - Bump map settings

Step 4 - Bump map settings


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.

Step 5 - Elliptical selection

Step 5 - Elliptical selection


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%.

Grunged background - Final Image

Grunged background - Final Image

That’s it. Hope you liked it.
Download the tutorial’s GIMP file from here.

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