This GIMP (GNU) tutorial demonstrates how to apply create a Mystical Rainbow Seascape. 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.
Personal (Inspiration) Note
I was inspired to create this tutorial after a dream. In my dream, the water in my local Cullercoats Bay was transformed into brilliant rainbow colours.
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.
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).
The Free Select Tool
Understand Blend Modes
Launch GIMP & Organise Its Workspace & Palettes
Open your choice of Start Image onto GIMP’s workspace.
Now, create a New Transparent Layer above the Start Image, and name the Layer something like Water.
You will find the next step easier if you Zoom into your image.
3/ (Free Select Tool Tutorial For Beginners)
From the Toolbar, activate the Free Select Tool.
I’ve not activated Feather edges on this occasion. However, your image may benefit from a Feather edges setting of 1 or 2 pixels. It’s important to experiment, and discover what works best for your image’s needs.
Then (working on the Water Layer). Carefully isolate just the water with a Selection Marquee - as demonstrated below.
Now, from the Toolbox, activate the Blend Tool.
And select a Rainbow Blend of your choice from the Tool Options Box. And apply it over the Selected Water.
My Tutorial Here, demonstrates in detail how to utilise the Blend Tool.
Now for the magic. Change the Water Layer’s Blend Mode from Normal to Colour. And lower the Layer Opacity to around 80%.
For personal blends, it’s important to experiment with different Blend Modes and Layer Opacities.
From the top menu, choose Select then choose None.
Eraser Tool Tip
You can remove unwanted colour, for example, from the rocks, by applying the Eraser Tool. Set a Soft Round Brush and a low Opacity.
It’s a good time to save your Layered Image as a GIMP XCF File.
When you are happy with your final image, from the top menu, choose Image and then choose Flatten Image.
To create extra impact, apply a Sharpening Filter of your choice - Filters then Enhance.
Blur Tool Tip
Any ragged Screen edges can be smoothed using the Blur Tool .
Congratulations, your Mystical Rainbow Seascape is complete, and it is ready to save.
Now you are more familiar with this technique, you can have lots of fun creating rainbow seascapes.
Wendi E. M. Scarth. Top of Page.