A smartass and wrong! You obviously messed up thinking OP’s initial upvote wouldn’t count towards the percentage. The correct formula is n + 2
upvotes for n
downvotes, which makes 0.5 < (n+2) / (2n + 2) < 0.505
, solve for the smallest possible n₀ = 100
, giving us 102 + n
upvotes and 100 + n
downotes
Any photo editor will do. Just load it in and export as JPEG or smaller resolution.
On f-droid:
Pocket Paint is crashy for me, but it gets the job done.
Imagepipe has a bit clunky interface but just to load and export it works fine. Its primary advertised purpose is to remove metadata from photos, so not a bad thing to have on hand anyway.