SUbtitles&Font in an mkv

[merlinmage]

Hi Guys,
I recently ripped some DvD's in an mkv Container with H264 Video Stream,AAC Audio Stream,and an SSA Subtitle-File.
Now some ANime Groups included Fonts as an Attachement in the mkv with changed the Font of the Subtitles.Ive tried to do the same in the mkv Muxer Gui mkvmerge :To add the Font as an Attachment.
But after muxing the Style of the Subtitels remains in an ugly color and nothing has changed.
How can I change the Font?

[Milvus]

All the caracteristics of the subtitles have to be specified in the ssa/ass subtitle file. Including the fonts in MKV is a feature made for portability : you can watch the MKV on any computer, without installing the fonts.

I suggest you to use Aegsiub (http://aegisub.cellosoft.com/) as an ass/ssa editor, and to google for an ass/ssa tutorial.