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GIMP
Choose it when you want to inspect and refine a mask yourself.
In its favour
- Layer masks let you correct missed areas without permanently erasing the original pixels.
- Manual tools help separate an object from a background of similar color.
- You can keep a layered working file while testing different edge treatments.
Against it
- A convincing edge around loose hair or fine fabric can take several passes.
- The desktop interface takes practice if you only need a quick cutout.