Masking and anonymize information with a bar in GIMP

January 29, 2023

Masking is a useful tool in GIMP that can be used to hide parts of an image. To add an alpha channel in GIMP, you can access the command from the image menubar through Layer → Transparency → Add Alpha Channel. Alternatively, you can access it through Add Alpha Channel of its context pop-up menu at the Layer Dialog. To censor in GIMP, select an area you wish to be censored using select tool. Then go to menubar Filters > Blur > Pixelize > OK. You can repeat censoring by pressing Ctrl+F to make censored area more unclear. Unselect by pressing Ctrl+Shift+A.

To anonymize information with a bar in GIMP, you can use the masking effect. First, open GIMP and load the image with the objects that you want to blur. Then click the selection tool from the GIMP Toolbox that is best suited for selecting the things in your image that you want to blur. For example, use the Rectangle Select tool for signs, the Ellipse Select tool for faces or the Free Select tool for things that have irregular shapes. Click and drag your mouse cursor over the part of the image you want to blur. Finally, go to menubar Filters > Blur > Pixelize > OK. This will create a blurred bar over the selected area, effectively anonymizing the information.

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