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by Wendi E. M. Scarth.
 

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 Replace Dull Skies

 

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Replace A Dull Sky
GIMP (GNU) -
Intermediate Plus

Replace Washed Out Skies GIMP

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This GIMP (GNU) tutorial demonstrates how to replace a washed out sky with a photograph of a sunny sky. To work along, you are welcome to download the Start Images I am working with HereUnzip the file and open the Start Images 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.

Resize Images
Understand Layers
Launch GIMP & Organise Its Workspace & Palettes

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).

1/
To open the two Start Images onto GIMP’s workspace: from Gimps’ top menu, choose File then Open - Ctrl then O. Now, from the Open Image dialogue box, navigate to the folder where your Start Images reside, then Ctrl-click to highlight both files - and then click the Open tab - as illustrated below.





2/
Now, from the Tynemouth Image’s Top Menu, choose Edit and then choose Copy.



3/
And then from the Sky Image’s Top Menu, choose Edit and then choose Paste as and then choose New Layer - as illustrated below.





Note
It’s safe to Close the original Tynemouth Image - top menu, then File then Close



4/
Now, ensure the Tynemouth Image remains the active Layer, as illustrated above. And then from the left-side Toolbox, activate the Scale Tool.



Then left-click once over your workspace’s image. Your image will now be isolated by a Rectangular Shaped Bounding Box. Now, by manipulating (tugging) the Small Repositioning Handles that are attached to the Bounding Box, enlarge the Tynemouth Image so it fits the Sky Image precisely. (
Scale Tool Tutorial Here).

Tip
If you like, you can reposition the Sky Image by dragging it with the Move Tool.





To commit the resize operation, click the following Scale tab.





Tip
Now is a good time to save your Layered Image as a
GIMP XCF File - top menu, then File and then Save As.

5/
Ensure the Tynemouth Image’s Layer is active.



And then from the left-side Toolbox, activate the Fuzzy Select Tool.



And from the left-side Options Box, set the following Add to current selection Mode and Threshold 15 settings.



Note
The settings above are perfect for the image I am working with. However, when working with your photographs, it’s important to experiment with the Fuzzy Select settings, and discover a combination of settings that works best for your photograph’s requirements.

Now, left-click once over your photograph - as illustrated below.



You are looking to isolate just the Sky with a Selection Marquee - (moving dotted lines). Therefore, because you have set the Mode to Add to current selection - go straight ahead and continue left-clicking over the washed out sky to expand the Selection Marquee so it isolates just the sky.

Tip
If you find the Selection Marquee has expanded into unwanted areas - such as the buildings, then press Ctrl then Z to step backwards.

After you have fully isolated the washed out sky with a Selection Marquee - as illustrated below; you are ready for the next step.



6/
From the top menu, choose Select and then choose Grow. And from the subsequent Grow dialogue box, enter a Grow Selection By value of 1 pixel, and then click OK.





7/
Then from the top menu, choose Edit and then choose Clear. (Alternatively, tap your Delete Key).

The area within the Selection Marquee, for example the Dull Sky: will be removed. This reveals the underlying Blue Sky Image, as illustrated below.

  

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



Tip
If you notice part of the original sky pixels have remained - as illustrated below.



You can remove them either with the
Eraser Tool - or the Free Select Tool.

Zoom Tip
You will find removing stray pixels much easier if you enlarge your image by Zooming into it.



After you have removed all traces of the original dull sky pixels, you are ready for the next step.



Tip
Now is a good time to save your Layered Image as a
GIMP XCF File - top menu, then File and then Save As.

9/ Flatten Image
When you are happy with your work: from the top menu, choose Image and then choose Flatten Image.



10/
Now, from the top menu, choose Colours and then choose Levels. And from the subsequent Levels dialogue box, grab the White Point Slider, and drag it a little to the left - and then click OK.



This brightens your image, as illustrated below.



11/
Congratulations, your work is complete,
and it is ready to save - top menu, then File then Save As.
 
Now you are more familiar with this technique, you can have lots of fun replacing dull and washed out skies with a suitable image of your choice.


Wendi E. M. Scarth. 
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