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Pop Art Quarter Grid 
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Pop Art Photographic Conversion: Quarter Grid
Pop Art Conversion Part Four GIMP (Quarter Grid)
GIMP (GNU) - Intermediate Plus - Weekend MasterClass
(
Pop Art Part 1 Preparation Here)
(
Pop Art Part 2 Colourise)
(
Pop Art Part 3 Change Colour Here)

Click An Image To Access The Tutorial

Click An Image To Go The The Corresponding TutorialPop Art Part 1 PreparationPop Art Part 2 ColourisePop Art Part 3 Change The ColoursPop Art Part 2 Quarter Grid
Pop Art Conversion Part 4: Change The Colours

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This GIMP(GNU) tutorial demonstrates how to create a Quarter Pop Art Grid.
In Part One of my Four Art Pop Art Collection
Here, you learned how to prepare your photograph.  In Part Two, Here; you learned how to Colourise your prepared image. And in Part 3, Here, you learned how to Change The Pop Art Colours.

To work along, you are welcome to download my Flattened Colourised Pop Art Image
Here.  Unzip the file and open the image onto GIMP’s workspace.

Your colourised image and Layers Palette should resemble the following.

           Pop Art Conversion Part 3: Change The Colours

Note
Each photograph is unique, and therefore has different needs. With this in mind, when working with your image, it’s important to experiment with the settings outlined in this tutorial.

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.

(Pressing the Shift Key and then simultaneously tapping the + (Plus) Key enlarges - (zooms into), your image. Tapping the - (minus) Key zooms out of an image).

1/
Open your Flattened Pop Art 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, Duplicate the Background Layer by right-clicking over it and selecting Duplicate Layer from the subsequently drop-down list. Repeat this twice more, and you will have four identical Layers in the Layer Palette.
 


3/
Activate the Bottom (Background) Layer.



4/
Then from the top menu, choose Image and then choose Canvas Size. Now, from the subsequent Set Image Canvas Size dialogue box, you are looking to expand the active Layer’s (The Background’s) Width and Height sizes. And this will accommodate your four Pop Art Images. (If you would like a border around each image, then set the Width and Height to allow for a border). I am not creating a border. 

Therefore, make a note of your Set Images Canvas Size Width and Height dimensions, highlighted in red below.



Now, times the Width dimension by 2 (you are doubling it). In this instance, doubling my Width dimension gives a total calculation of 2400 Pixels. And doubling my Height dimension equates to 3460 Pixels. Therefore, if you are working with my pop art image, type 2400 (Pixels) into the Width box, and type 3460 (Pixels) into Height box, and then click Resize - as illustrated below. 



If you have calculated correctly, the Bottom Image’s canvas size will expand to accommodate all four images, leaving no spare pixels. (Don’t worry too much if the expanded canvas is larger, if this happens, just Crop your Pop Art Quarter Grid to size when it’s complete).

Reduce Your Image’s Size: Tip
Tap your Minus Key (-) to reduce your image’s size.

       

5/
Now, from the left-side Toolbox, activate the Move Tool.



Then form your Pop Art Quarter Grid by dragging each of the remaining three images to the Top Right, Bottom Left and Bottom Right corners, respectively. 

Note
You can tap each image into position pixel by pixel by tapping the corresponding Keyboard Arrow Key.



Tip
Before tapping the three remaining images into position with the Arrow Keys; first activate the Image’s Layer (in the Layers Palette) - as illustrated below-right. Then left-click to activate the corresponding Grid Image as illustrated below-left.



Tip
It’s a good time to save your Layered Image as a GIMP XCF File.

After you have repositioned your four images to form a quarter grid, your images and Layers Palette will resembles the following. Congratulations, you are now ready for the next step.

        

6/
It’s time to change three of your four pop art image’s colours. Therefore, first activate (for example) the Top Right Image’s Layer - as illustrated below.



7/
Now, activate the Fuzzy Select Tool, and retaining its previous settings, left-click once over the active image’s Top-left Corner - just as you did with the Background Area in Part Three




 


8/
Then right-click over the Selected Corner, and from the subsequent drop-down
list, choose Select and then choose By Colour - just as you did with the Background Area in Part Three. Now, left-click once over the Selected Corner area; just as you did with the Background Area in Part Three. This will isolate all Background (and Lip) Pixels with a Selection Marquee - as illustrated below.



9/
Now, Grow the Background and Lips’ Selection Marquee by 1 Pixel, just as you did with the Background and Lips back In Part Three.



10/
Then change the Selected Area to a colour of your choice using the
Hue-Saturaton Command, just as you did with the Background/Lips Colour back in Part Three.



         

11/
Now, remove the Selection Marquee - Select then None.



12/
And still working on the Top Right Image’s Layer. Change the Dress Colour (and the Hair if it is Blonde) - exactly as you did with the Background and Skin Tone Colours, fully demonstrated in Part Three (Change The Colours) Tutorial. Then remove the Selection Marquee. After you have changed the Dress and Hair Colours, and have removed the Selection Marquee: you are ready for the next step.

13/
Now, activate the Top Left Image’s Layer: and change its colours. Then activate the Bottom Left Image’s Layer, and change its colours. And finally, activate the Bottom Right Images’ Layer, and change its colours: - just as you did with the Top Right Image

After you have changed each image’s colours, you are ready for the next step.
   

Tip
It’s a good time to save your Layered Image as a GIMP XCF File.

14/
To finish, from the top menu, choose Image and then choose Flatten Image.



15/
Congratulations, you have successfully created a Pop Art Quarter Grid, and your image is ready to Optimise and Save.

Now you are familiar with the technique, you can have lots of fun converting your favourite images into colourful pop art conversions.

Pop Art Conversion Part 4: Change The Colours


Enlarge Your Image
This type of blocky line-art image is perfect for enlarging. To digitally enlarge your image; from the top menu, choose Image then choose Scale Image. From the subsequent Scale Image dialogue box, ensure the Constrain Proportions Chain is not broken. Then change the measurements to Inches. Now, type 11.694 into the Width box, and type 16.847 into the Height box. Ensure Cubic is active and then click Scale. Your image will now be enlarged to approximately A3 size. (Scale your image to a larger size, if you prefer).



Note
If scaling would produce an image larger than the “Maximum new image size” set in the Environment page of the Preferences dialogue (which has a default of 64Mb), you are warned and asked to confirm the operation before it is performed. You may not experience any problems if you confirm the operation, but you should be aware that very large images consume a lot of resources and extremely large images may take more resources than you have, causing GIMP to crash or not perform well.

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