Larger sized image?

If I have a larger sized image of an existing post, is there a way to tag it so that it links to the other post, or maybe replace it, or something? Need a little help / info about that if possible.

Make the larger-sized image (assuming it isn't just a shitty upscale) the parent--go to the smaller post, click edit, enter the id of the larger image in the "parent" field.

Don't forget to tag it "duplicate"

Granola said:
Don't forget to tag it "duplicate"

But if the resolution of the image is higher, then it isn't a duplicate right?

Tag the child as duplicate, even if it's older the smaller image is by danbooru terms the dupe.

That's what I meant. Maybe my sentences should be longer.

Ok, thanks for the help