graphics/databank/databankmk1.png -- 1024x1024px, static, no animation.

That size maps exactly onto the 16x16 tile footprint already set in
prototypes/data-bank.lua (16 tiles * 64px/tile hi-res = 1024px), so no
other changes are needed once the file is here.

Different pixel size? Change `scale` in the data-bank-mk1 prototype's
`picture` field to (16 * 32) / <your_width>.
