This GIMP (GNU) tutorial demonstrates how to quickly add drama to an image by applying GIMP’s Posterise Filter. To work along, you are welcome to download the Start Image I am working with Here. Unzip the file and open the image onto GIMP’s workspace.
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
Launch GIMP & Organise Its Workspace & Palettes
Open your choice of Start Image onto GIMP’s workspace - File then Open - Ctrl then O.
Ensure the Layers and the Undo History Palettes are visible, and then drag them into position over your workspace - (Windows then Dockable Dialogues - then click Layers and Undo History).
Then from the top menu, choose Colours and then choose Posterise. And from the subsequent Posterise dialogue box, experiment with different Posterise Levels.
To quickly scroll through the Posterise’s Numerical Values, first highlight them with your mouse, and then tap your Keyboard’s Up or Downward Facing Arrows - as illustrated below.
When you are happy with the level of posterisation, click OK.
Congratulations, your distressed photographic 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.