PASTEing one Pic into Another

[gaystan]

Hi everybody :
  I'm still learning my way around GIMP. When PASTEing a photo 
into an "open" photo (setting the inset photo as a layert),  is there a 
way to "unerase" the layered photo when I make a mistake. In other words,
to "fine tune" ERASEing  the inset image to match the outline of the 
base image ?
garystan
document.oncontextmenu = null; document.body.onpaste = null; document.body.onselectstart = null; document.onselectstart = null; document.ondragstart = null; document.body.oncut = null; document.onmousedown = null; document.body.oncontextmenu = null; document.body.oncopy = null; document.body.ondragstart = null; document.body.onmousedown = null;

[sl60]

What I do is paste the second image into the first (base) image as a layer and then (with the second image layer selected) use the eraser tool to get rid of what I don't want in the second image.

[rich2005]

Quote:...When PASTEing a photo into an "open" photo (setting the inset photo as a layert),  is there a way to "unerase" the layered photo when I make a mistake. ..snip...

Use a layer mask, it is non-destructive see:
https://docs.gimp.org/2.10/en/gimp-layer-mask-add.html
https://www.gimp.org/tutorials/Layer_Masks/

Quick example: looks like this:

   

Quote: In other words, to "fine tune" ERASEing  the inset image to match the outline of the base image ?

Look into making a selection then create the mask from the selection. One of the options in Layer -> Mask -> Add Layer Mask.

[sallyanne]

Another way is to feather the image/layer. You don't want to cut your image too close if you have a large feather - This will show as gradually going into your background picture then.