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Resize 2 Images 
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Resize Two Layered Images Equally

Resize Two Images So They Are The Same Size GIMP (GNU)

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This GIMP (GNU) tutorial demonstrates how to resize two layered photographs, so they are the same size. To work along, you are welcome to download the Start Images I am working with Here. Unzip the file and open the Start Images onto GIMP’s workspace.

It’s important to work with two images of the same orientation. By this I mean, ensure both images are either Landscape or Portrait. (My Start Images are both Landscape).

Scale Image Command Note (
Scale Image Command Tutorial)
The simplest way to resize two image so they are the same size is to activate each image (one at a time); and then utilise the Scale Image Command - Image then Scale Image. From the subsequent Scale Image dialogue box, enter identical Width and Size values into each image’s Image Size box - as illustrated below, and then click Scale. When utilising the Scale Image Command to resize two images, don’t Layer them first.

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
Launch GIMP & Organise Its Workspace & Palettes

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/ Resize Two Images Using The Scale Image Tool
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 Open.

Now, from the Water Image’s Top Menu, choose Edit and then choose Copy.

Then from the Flower Image’s Top Menu, choose Edit and then choose Paste as and then choose New Layer - as illustrated below.

It’s safe to Close the original Water Image. (Top menu, then File then Close). 

Now, activate the Water Image’s Layer by clicking it.

5/ (
Utilise The Scale Tool Tutorial)
Then from the left-side Toolbox, activate the Scale Tool.

Then left-click once over your workspace’s Layered Image. The Flower Image will now be isolated by a Repositioning Bounding Box, that has 9 Repositioning Handles attached to it - as illustrated below. 

Now, you are looking to “stretch” the Flower Image, so it is exactly the same size as the Water Image. To do so, grab the Bottom-right Repositioning Handle, and drag it Diagonally towards the Bottom-right - as illustrated below.

This in turn, “stretches” the Water Image, subsequently enlarging it. 

Now, reposition the Water Image’s Bounding Box so it is exactly the same size as the underlying Flower Image by tugging one of the outer Repositioning Handles as necessary - as illustrated below.

And when you are satisfied that both images are exactly the same size, click the following Scale tab to complete the rescale.

Now, in my example below, you’ll notice that the Water Image’s Rectangular Selection Marquee slightly transcends the Underlying Flower Image along the right-side. This is an indication that the two images are not the same size.

To correct this, reactivate the Scale Tool, (and in this instance) gently tug the Right-side Central Repositioning Handle a little to the left, and then click the Scale tab to complete the rescale.

You’ll know both images are exactly the same size when the Rectangular Selection Marquee is positioned snugly around the image - as illustrated below.

Note: Rescale A Large Image
To Rescale the Flower Image so it’s the same size as the Water Image. First, activate the Flower Image’s Layer.

Now, activate the Scale Tool. And reduce the Flower Image’s size by tugging its Right-lower Repositioning Handle, diagonally upwards and to the left - as illustrated below.

And then click the Scale tab to commit the scale.

Then finish by activating the Crop Tool, and crop away the extraneous Chessboard Background. (
Crop Tool Tutorial).

Commit the Crop by left-clicking inside the image.

7/ Flatten Image
When you happy with your rescale. 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.
Wendi E. M. Scarth. 
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