Bitmaps: Used to select an existing Bitmap object for use by this Texture, or create a new Bitmap object.
Left / Right / Top / Bottom: Controls left, right, top, and bottom indexes into the selected Bitmap, respectively.
Use alpha channel: This Texture will use the selected Bitmaps alpha channel to control the underlying polygons transparency, if Transparency is enabled for rendering.
Use luma only:
Use full-size bitmap: If you are using a large (greater than 256 x 256) bitmap and your system doesnt have a lot of RAM, turning this option on can speed up rendering (but decreases the quality of the texture).
Perspective Projection: When enabled, textures render properly when their polygons are turned "edge-on" to the Camera. Can be disabled for Textures being used by LensFlares, ImageLayers, ParticleBursts, etc. for an increase in rendering speed.
Texture antialiasing: Toggles texture antialiasing.