Spumux Transparency Attributes

In Spumux, you can define a “transparent” colour. Any pixels matching 
this colour are set to transparent in the generated subpicture layer. If 
not specified, this colour defaults to 50% grey.

The <spu> tag has a “transparent” attribute that you can use to specify 
a different transparent colour. However, the <textsub> tag for defining 
text subtitles also had an undocumented “transparent” attribute.

Turns out this latter setting was worse than useless. The text-rendering 
system assumes this colour is going to be 50% grey. So if you set it to 
anything else, suddenly the transparent background to the lettering is 
no longer transparent, it becomes filled with 50% grey, blocking out 
that part of the video.

So I have removed that undocumented textsub attribute. This won’t affect 
the use of transparency for images.

Question: did anybody know the default setting for this was 50% grey? Is 
anybody relying on this?

It seems to me a more sensible default setting is not to have a 
transparent colour at all.

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