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Rainbow Seascape 


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 Fantasy Rainbow Seascape

Fantasy Rainbow Seascapes GIMP

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This GIMP (GNU) tutorial demonstrates how to enliven a dull photograph by applying a rainbow Gradient to it. To work along, you are welcome to download the Start Image (Tynemouth) -  I am working with HereUnzip 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 drop-down list.

Understand Layers
Understand Blend Modes
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).

Now, create a New Transparent Layer by clicking the following Create a New Layer tab that is located at the bottom-left of the Layers Palette. (Ctrl then N).

Then from the subsequent New Layer dialogue box, click OK.


Then from the left-side Toolbox, activate the Blend Tool.

And from the Blend Tool’s left-side Options Box, click open the Gradient Swatch, and from the subsequent drop-down Gradient Library, click over a Gradient you like the look of. I have selected the following Full Saturation Spectrum Gradient

For personal results, experiment with different Gradients and Gradient Shapes.


Now, still working on the New Layer: press down the Ctrl Key and simultaneously left-click and stretch vertical “Gradient Line” in the direction illustrated below. 

As soon as you release the mouse button, your choice of Gradient will be applied over your image.

Understand Layers - Understand Blend Modes
From the Layers Palette; change the Rainbow Layer’s Blend Mode from Normal to Overlay.

For personal results, it’s important to experiment with different Blend Modes and discover a blend that suits your needs.

To finish, from the top menu, choose Image and then choose Flatten Image.

Sharpen Tip
To create extra impact, apply a
Sharpening Filter of your choice - Filters then Enhance.

Congratulations, your work is complete,
and it is ready to save - top menu, then File then Save As. GIMP 2.8 - File then Export.
Now you are familiar with this technique, you can have lots of fun reviving dull photographs by applying a colourful gradient to them.

Fantasy Rainbow Seascapes GIMP

Wendi E. M. Scarth. 
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