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If I open a JPG as a layer and scale it up 2x with the Shift+S tool, I notice that the edges of the scaled images are now semi-transparent, even though the JPG does not have transparency information of course.

How to prevent that?

Tested on GIMP 2.10.18.

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I found a working solution at: http://gimpchat.com/viewtopic.php?f=8&t=12815#p173563 by using:

  • Layer
  • Scale layer

instead of Shift + S. I then just use the default Cubic interpolation provided there.

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If you want to scale the image use Image ➤ Scale image (this scales everything in the image: layers, channels and path). You can also use Layer ➤ Scale layer to scale a specific layer to specific dimensions. The scale tool is more meant to adjust the layer size with regard to something else in the image. You get fuzzy edges if you move the top left corner of the layer when using the tool.

Interpolation type is irrelevant for the semi-transparency, it is usually best to use NoHalo.

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