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This GIMP (GNU) tutorial demonstrates how to utilise GIMP’s Page Curl 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.
Note
This filter curls a corner of the current Layer or selection into a kind of cornet showing the Underlying Layer in the cleared area. A new “Curl Layer” and a new Alpha Channel are created. The part of the initial Layer corresponding to this cleared area is also transparent.
Notes
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
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Open your choice of Start Image onto GIMP’s workspace - File then Open - Ctrl then O.
Note
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).
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Then from the top menu, choose Filters and then choose Distorts and then choose Pagecurl. And from the subsequent Pagecurl dialogue box, experiment wiht the settings, and then click OK.
Curl Location
You have four radio buttons to select the corner you want raise. The Preview is redundant and doesn't respond to other options.
Curl Orientation
Horizontal and Vertical refer to the border you want raise.
Shadow Under Curl
This is the shadow inside the cornet.
Use Current Gradient Instead of FG/FB-colour
This colour refers to the outer face of the cornet.
Curl Opacity
Refers to the visibility of the Layer part underlying the cornet. It may be set also in the Layer Dialogue.
 
Blur Tool Tip
Ragged edges can be gently smoothed using the left-side Toolbox’s Blur Tool: setting a low Blur Rate.
 
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To finish, from the top menu, choose Image and then choose Flatten Image.
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Congratulations, your work is complete and it is ready to optimise and save.
Fill Layer Tip
My Tutorial Here demonstrates how to create a Fill Layer and Fill it with either a Solid Colour, Pattern or a Gradient.
 
Now you are more familiar with this technique, you can have lots of fun applying personalised page curls to your favourite images.
Wendi E. M. Scarth. Top of Page.
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