How to Make a Double Line Border Gimp
Using the free graphic design program GIMP, you can create a variety of digital effects including borders. You can use the paintbrush to freehand a border of your choice, or you can use the "Border" tool to achieve uniformity for all edges. This tool naturally creates a one-line border, but you can perform that operation and then use the "Shrink" tool to isolate a selection and split your border into two distinct lines.
Instructions
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1
Launch your software and open the image you want to work with, selecting "File" and "Open" to locate your document. Insert a new layer by clicking on "Layer" and then "New Layer." Select "Transparency" as the "Layer Fill Type."
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2
Click on the "Select" tab and the "All" option. Click back on the "Select" tab and choose "Border." Enter the number of pixels or inches you want the entire border to occupy. For example, if you want a border with a 4-pixel space in between two 10-pixel lines, select a border size of 24 pixels; press "OK" when satisfied.
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3
Select the "Bucket Fill Tool" located in the main toolbar, and click on the "Foreground Color" box to select the color you would like your border to be. Once you have your color chosen, click inside the border selection to fill the entire area.
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Use the "Select" tab again to click on "Shrink." Adjust the shrink selection as needed, entering in "10" pixels if that is the thickness you want your border lines to have; press "OK."
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Delete the shrunken selection using your "Delete" key or selecting "Edit" and "Cut." Refer to the "Select" tab again choosing "None" this time.
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Tips & Warnings
If you want your border lines to be filled with a pattern instead of a solid color, after you have selected the "Bucket Fill Tool," look at the "Bucket Fill" settings that appear at the bottom of the main toolbar. Select "Pattern fill" instead of "FG Fill" and choose from GIMP's presets.
Be sure to save your bordered image using a different file name than your original if you want to preserve the image with and without the digital changes.