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Using GIMP or Photoshop, either one of them. When selecting a part of the image using selection tool, how can i export this selection as a pixel map?

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  • Select>Save to channel
  • In the Channels list, make sure the "Selection Mask Copy" channel is selected (it normakky should be, by default)
  • File>Export: this will export the selection mask as an image (PNG or else)

To import back:

  • File>Open as layers (loads the selection mask image on top of layers)
  • In the Channels list, right click any of the R/G/B channels and "Channel to selection".
  • Hide/remove the mask layer
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