Ender the Xenocide's board-to-board with Killjax
From Halopedia, the Halo wiki
From Halopedia, the Halo wiki
Yes actually, because 343 loves, for whatever reason, heavy contrast on top of bright lighting in their cutscenes. I only do some very minor changes to pull out some detail, not much.
Yes, width wise. With paint, if I remember correctly, press "Select" (top somewhere) then you can crop an area with the cursor (if you need to know, its plus-shaped) it gives you. Hope that helps.