The TGraphic class is an abstract base class for dealing with graphic images such as bitmaps, pixmaps, icons, and other image formats.

LoadFromFile - Read the graphic from the file system.  The old contents of
        the graphic are lost.  If the file is not of the right format, an exception will be generated.
      SaveToFile - Writes the graphic to disk in the file provided.
      LoadFromStream - Like LoadFromFile except source is a stream (e.g.  TBlobStream).
      SaveToStream - stream analogue of SaveToFile.
      LoadFromClipboardFormat - Replaces the current image with the data
        provided.  If the TGraphic does not support that format it will generate
        an exception.
      SaveToClipboardFormats - Converts the image to a clipboard format.  If the
        image does not support being translated into a clipboard format it
        will generate an exception.
      Height - The native, unstretched, height of the graphic.
      Palette - Color palette of image.  Zero if graphic doesn't need/use palettes.
      Transparent - Some parts of the image are not opaque, ie the background
        can be seen through.
      Width - The native, unstretched, width of the graphic.
      OnChange - Called whenever the graphic changes
      PaletteModified - Indicates in OnChange whether color palette has changed.
        Stays true until whoever is responsible for realizing this new palette
        (ex: TImage) sets it to False.
      OnProgress - Generic progress indicator event. Propagates out to TPicture
        and TImage OnProgress events.

As many of the methods and properties are virtual and/or abstract, it is the responsibility of the application programmer to supply suitable methods when implementing any descendant classes