From Heroes of Hammerwatch wiki
Creating assets
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The basics
To start creating assets, there are a few rules that need to be followed. Whether the file is for a tileset, doodad, item, or actor, the image's height and width need to be by the power of 2 (^2). Both width and height don't need to match. It is also recommended that the file format supports an alpha channel for transparency. Files like JPEG don't have transparency channels but files like PNG do. ( Untested but I'm pretty sure the game won't accept a file without a transparency channel.)
Examples: Height:512px Width:256px OR Height:16px Width:1024px
More information on the wiki on power of 2
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