Graphics Development

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OpenTTD supports modding the game via NewGRF plug-ins. NewGRFs can alter game play, can replace existing and introduce new graphics. Additionally OpenTTD has support for 32bpp graphics which always replace an existing 8bpp sprite (either base set or NewGRF). There exists a 32bpp "full-zoom" branch which adds two additional zoom-levels to OpenTTD. Note, though, that the "full-zoom" replacement graphics will NOT work with an official and unpatched version of OpenTTD.

8bpp	NewGRF development tips and tricks NewGRF development tools Debugging NewGRFs Hints on sprite alignment Changes to NewGRF which break their backward compatibility 8bpp Base Set OpenGFX project (GPL v2 - licensed base set for OpenTTD) DevZone - home for a number of NewGRF projects Wiki with NewGRF specification (NFO) Project page of NewGRF Meta Language (NML), an alternative to NFO aimed at making NewGRF coding easier
	NewGRF usage guide and NewGRF List Documentation of NewGRF use and installation. Manual to alter the gameplay and graphics files using NewGRF. And a list of some major NewGRFs.
32bpp	32bit Graphics Development - project home Suggestions for 32bit Graphics Developers Category:32bpp Graphics Playing with 32bpp graphics! Forum 32bpp NewGRFs (subproject) Developing 32bpp NewGRFs Base set replacement (subproject) 32bit base set conversion project - description, requirements etc. Progress tracker