TImagingGraphic descendant for loading/saving Windows bitmaps.
public TImagingBitmap = class(TImagingGraphicForSave);
ImagingComponents (at line 139)
VCL/CLX/LCL all have native support for bitmaps so you might want to disable this class (although you can save bitmaps with RLE compression with this class).
TBitmap TImagingGraphic TImagingGraphicForSave TImagingBitmap