Krita

Krita is an open source graphics editor. It has a native layered raster graphics format called .kra or Krita document. The format uses a ZIP container, and appears to be similar to OpenRaster.

Identification
Similar to OpenRaster, one of the files in the ZIP container is named "", and its contents are the ASCII string "". Ideally, that's the first file in the container, and it's stored without compression. This means that, because of the way ZIP works, Krita documents should have "" at offset 30, but we've observed some that lack this signature.

Sample files

 * https://github.com/KDE/krita/tree/master/krita/data/templates/ .../*.kra
 * https://telparia.com/fileFormatSamples/image/kra/

Links

 * Krita website
 * Krita History
 * KRITA Documentation: *.kra - Very minimal information about the .kra format
 * Krita