03-12-2019, 11:14 AM
More than one way, sometimes depends on the image.
In the tool box, select the Clone Tool.
In the Tool Options, select a suitable brush (eg round, hardness0.75).
Adjust the brush size to suit.
Set the Source by Right-Click (source is part of the image to be copied).
Click-Drag over the white mark (with the Left mouse button).
More info here: https://docs.gimp.org/en/gimp-tool-clone.html
Another method is to download and install the Resynthesizer plug-in. This is a collection of about 6 filters. One of them is "Heal Selection". This is good for removing marks, telephone cables, etc.
In the tool box, select the Clone Tool.
In the Tool Options, select a suitable brush (eg round, hardness0.75).
Adjust the brush size to suit.
Set the Source by Right-Click (source is part of the image to be copied).
Click-Drag over the white mark (with the Left mouse button).
More info here: https://docs.gimp.org/en/gimp-tool-clone.html
Another method is to download and install the Resynthesizer plug-in. This is a collection of about 6 filters. One of them is "Heal Selection". This is good for removing marks, telephone cables, etc.