The Bitmap Options tab contains properties that define several options that can apply to embedded or linked pictures in the Windows Help system. Bitmap options do not apply to Video, Coded RTF, or OLE object files.
Bitmap Alignment
Allows you to choose how the picture file will be aligned to the text in Windows Help.
Bitmap Transparency
Determines if the picture file is inserted into Windows Help with a transparent background or not.
Note: Windows Help will convert the color at the index position of 16 in the color pallet of the image to the same color as the background of the help window. This color may not necessarily be white. Therefore, this setting may sometimes provide unpredictable results.
See also: File object properties