PNG

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PNG (for 'Portable Network Graphics') is a graphic file format that is supported by ZDoom in a few different ways:

  • Screenshots are stored as PNGs
  • Savegames are stored as PNGs, with game data stored in meta-data chunks. This allows one to save their game, and be able to look through their saves with any program that can view PNGs, as the savegames appear as a screenshot at the point of the save.
  • You can insert (8 bpp) PNG files between TX_START and TX_END (more info on those in Texture) lumps in a wad file, and use them as textures.

Although ZDoom can convert any 8-bpp image to use the current palette, it will royally screw up on anything else. If you use GIMP to create your images, it can be hard to convince it to save them this way.

PNG used for sprites and decals may include the ZDoom-specific lumps:

  • grAb - indicates the center position of the image
  • alPh - indicates that a grayscale image should be treated as a standalone alpha channel (for decals).

These lumps may be set using SetPNG

Retrieved from "http://zdoom.org/wiki/PNG"
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