;
, Add some text, symbols, etc., that you intend to use to verify your ownership of your image.
 Just be sure to not make it zero.
 The .tiff format works the best. Note that this is the image you will be making public, so keep a backup of the original image without the watermark too.


To save it on the Internet, you will need to use a compatible format, such as exporting to a JPG, PNG, or GIF file.
 After you realize that your image has been stolen, you can complain to the respective authorities, but they need some sort of evidence. This is where your original image comes in to play. Open your original image and then open your watermarked image as a layer over it.
 Then go to filters-enhance-unsharp mask and change the amount to 10.0. This will reveal your hidden watermark.
Open your desired image in GIMP.
Create a new transparent layer.
Lower the opacity of this layer so that its contents are no longer visible to the naked eye.
Merge both your layers and save this image under a new name.
Ensure that you have incorporated the integrity of ownership or proof of ownership before uploading.
Change the layer-mode of your watermarked image to "Grain extract" and merge both layers.
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