SupViewer

SupViewer is a simple, reliable and small (only 97 kb) program to show SUP subtitle files on either a checkered background or a (selectable) graphic.
It also allows you to change the colors of the palette and save the new palette as a dvdauthor compatible palette file.
Within the SUP file you may change the mapping of subtitle colors to the colors of the palette and also change the opacity/transparency of individual subtitles or for the whole SUP file. The changed SUP file can then be saved with a new filename.
The functionality is pretty much like SupRemap or the SUP manipulation tools inside SubtitleCreator, but SupViewer supports variable opacities (or transparencies).
The program requires GDI+, which is already included in Windows XP, for other Windows versions the necessary DLL may be downloaded from Microsoft.
A palette may be loaded from an IFO file or a dvdauthor compatible palette file, otherwise a default palette is used. You can save the palette (if changed in SupViewer) again as dvdauthor compatible palette file.
SupViewer can combine two SUP files to create one two language SUP file which can be used for language learning purposes (usually one language is shown as normal subtitle and the other as toptitle).