Palette changer tools?

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I've... been having shortcuts since forever?



This is how I do it:

Start with minimal X and maximalX equal to clicked X, minimal Y and maximal Y equal to clicked Y.

Until a turn passes without any size change,
- assume no changes will occur
- Iterare over the current width (minimal X to maximal X),
-- check each column up and down if the next pixel is of the background colour - if not, adjust minimal and maximal Y values (take a note that a change occured)
- Iterare over the current height (minimal Y to maximal Y),
-- check each row left and right if the next pixel is of the background colour - if not, adjust minimal and maximal X values (take a note that a change occured)

Hope this helps?