This GIMP (GNU) tutorial demonstrates how to create a monochrome lava spots background.
You can quickly Undo a step at any time by pressing Ctrl then Z. Alternatively, click a previous Undo History snapshot - Windows then Dockable Dialogues then click Undo History. In addition, to Zoom in (or Zoom out) of your image; from the top menu choose View then select a Zoom Tool from the subsequent drop-down list.
Launch GIMP & Organise Its Workspace & Palettes
Create a New Image, and set the following settings, then click OK. (Ctrl then N).
Now, from the top menu, choose Filters then choose Render and then choose Clouds and then choose Difference Clouds.
And from the subsequent Solid Noise dialogue box, enter the following X size and Y size settings, and then click OK.
Now, from the top menu, choose Colours and then choose Levels.
And from the subsequent Levels dialogue box, (one at a time), grab and position the Black Point Triangle, the Grey Point Triangle, and the White Point Triangle to the following positions, and then click OK - as illustrated below.
(Alternatively, you can clear and simply type in the numerical values highlighted in red below).
For personal results, it’s important to play with the Input Levels settings.
Congratulations, your Lava Spots Conversion is complete, and it is ready to save - top menu, then File then Save As. GIMP 2.8 - File then Export.
Wendi E. M. Scarth. Top of Page.