How to Stretch a Picture in GIMP
If you have downloaded or created an image that is too small for your needs, you can use the free image-editing program GIMP to stretch it. GIMP has the ability to stretch only the horizontal or vertical dimension of an image. You can also lock the aspect ratio of the image so that when you change one dimension, GIMP automatically stretches the other dimension so the image retains the correct proportions. Access these features with the Scale Image menu in GIMP.
Instructions
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Start GIMP. Open the image you want to stretch by dragging it into the main window of the GIMP image editor or by clicking "File" and "Open" and double-clicking the image in the file explorer window.
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Click "Image" on the top menu toolbar and select "Scale Image."
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Click the chain image between the "Width" and "Height" fields to edit the two dimensions separately. To have GIMP automatically scale one image when you change the other to retain its original proportions, skip this step.
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Open the drop-down menu next to the chain and select the type of stretching you want to perform on the image. For example, select "Pixels" to input the specific number of pixels that an image should take up, or select "Percent" to stretch the image as a relative percentage of its current size, such as "150%."
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Change the values in the "Width" and "Height" fields to stretch the image.
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Click "Scale" to stretch the image.
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Click "File" and "Save As" to save the stretched image as a new file.
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