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by Wendi E. M. Scarth.
 

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Rainbow Muffin 
Blend: GIMP

 

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Rainbow Muffin (Bun) Blend
GIMP (GNU) -
Intermediate Plus

Rainbow Muffin GIMP

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This GIMP (GNU) tutorial demonstrates how to create a rainbow coloured muffin. To work along, you are welcome to download the Transparent GIMP Start Image I am working with HereUnzip the file and open the image onto GIMP’s workspace.

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.

Understand Layers
Understand Blend Modes
Launch GIMP & Organise Its Workspace & Palettes

1/
Open your 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).



2/
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).



And from the subsequent New Layer dialogue box, name the Layer Rainbow, and then click OK.

                 

3/
Still working on the Rainbow Layer: from the left-side Toolbox, activate the Fuzzy Select Tool.



And then set the following attributes into the left-side Options Panel.



And then (still working on the Rainbow Layer). Left-click over a transparent area, as illustrated below.

Note
You may need to repeatedly left-click to select the Muffin.



4/ Invert The Selection Marquee
After you have isolated the muffin with a Selection Marquee (moving white lines). From the top menu, choose Select and then choose Invert - Ctrl then I.



5/
Shrink The Selection (To Eliminate Unsightly Halos)
From the top menu, choose Select and then choose Shrink. And from the subsequent Shrink Selection dialogue box, enter a Shrink Selection by (radius) of 1 Pixel, and then click OK.



Now, from the top menu, choose Select and then choose Invert. Then from the top menu, choose Edit then choose Clear. Then again, from the top menu, choose Select and then choose Invert. This shaves one pixel from the muffin, and eliminates unsightly halos.

6/ (Rainbow Blends)
Still working on the Rainbow Layer: from the left-side Toolbox, activate the Blend Tool.



And then set the following attributes into the left-side Options Panel.

Note
Click open the Gradient swatch and select a Gradient of your choice from the subsequent drop-down list.

Tip
For personal results, experiment with different Gradients and Gradient Shapes. 
I have selected a Linear Gradient Shape.

                        Click Open 

Then left-click and stretch a Gradient Line over your selected muffin, as illustrated below.



As soon as you release your mouse button, a Gradient will be applied to the selected muffin - as illustrated below.
 




7/
Now, to blend the Rainbow with the Muffin, change the Rainbow Layer’s Blending Mode from Normal to Overlay.

Tip
Once you have clicked to highlight a Blending Mode, you can quickly scroll through the Blending Mode choices by tapping your Keyboard’s Downwards or Upwards Arrows.



                         

Changing the blending Mode from Normal to Overlay, Blends the Rainbow Pixels with the muffin’s, as illustrated below.



Deepen The Colours
To deepen the rainbow colours, right-click over the Rainbow Layer, and then choose Duplicate Layer from the subsequent drop-down list. Then reduce the Rainbow Copy Layer’s Opacity to around 43%.



8/
From the top menu, choose Select and then choose Select None.



Hue And Saturation Tip
To enrich the colours, from the top menu, choose Colours and then choose
Hue-Saturation. And from the subsequent dialogue box, move the Saturation slider a little to the right, and then click OK.



9/
Now, from the top menu, choose Image and then choose Merge Visible.

                

10/
Then from the top menu, choose Filters then choose Enhance and then choose Unsharp Mask. Now, from the subsequent Unsharp Mask dialogue box, enter the following settings, or experiment, and then click OK.





11/
Congratulations, your rainbow-muffin blend is complete, and is ready to save - top
menu, then File then Save As.

Create A Fill Layer Tip
From the top menu, choose Layer and then choose New Layer. From the subsequent New Layer dialogue box, enter a name for the Layer, and then click OK.
 


Then left-click and drag the New Fill Layer to the bottom of the Layers Stack - as illustrated below.



Now, from the left-side Toolbox, activate the Bucket Fill Tool.



And from the Bucket Fill Tool’s left-side Options Panel: mark Pattern Fill, and then click over the small pattern swatch. And from the subsequent Patterns Library, left-click a pattern of your choice - as illustrated below.

                            

Now, (still working on the New Fill Layer), left-click over your rainbow muffin to apply the Pattern of your choice.





Apply A Drop Shadow Or A Perspective Shadow To The Muffin
Ensure the Muffin Layer is active, and then from the top menu, choose Filters then choose Light and Shadow and then choose Drop Shadow or Perspective Shadow. (If you are applying a Perspective Shadow, you may want to activate the Move
Tool
.



And then drag the Muffin to the left-side of the canvas. Now, from the subsequent Drop Shadow or Perspective Shadow dialogue box, enter settings of your choice, and then click OK.
 




Saving Notes - (
Save And Optimise Images Tutorial Here).
To retain the Transparent Background, save your image as a Transparent Gif. Alternatively if you save your image as a GIMP XCF Image, you will be saving the image in its entirety, this retains the Transparent Background and won’t compress the saved image.
 

 
Photoshop File Tip
If you prefer, you can save your image as a Photoshop Image file.



Rainbow Muffin GIMPt



Wendi E. M. Scarth. 
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