<https://forums.getpaint.net/topic/3059-layer-mask/>
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"In Photoshop we can use layer mask and the gradient tool to blend two images together seamlessly. I would like to know if this is possible in Paint.net. \nTo be more precise, let's say I have two images on two different layers in Photoshop and I add a layer mask to the top layer. Then I use the gradient tool with black and white colours to reveal/hide certain parts of the image on the bottom layer. I hope this makes sense. \nThe result is something like this image (though here several images were blended): \nhttp://www.kaposmero.hu/gamma/kepek/fejlec.jpg "
<https://forums.getpaint.net/topic/3059-layer-mask/>