Multiple subpicture streams in menu for different color schemes?

[Alex_ander]

My question comes from a puzzle: in some commercial DVDs menu buttons are positioned so that there seems to be no way to separately highlight them (hovering with rectangle), e.g. when adjacent buttons have sloping edges - but it works. Switched menus can't be used in case there's an audio track (no seamless switching). So I supposed that different subpicture streams might have been used. I can't find any option for multiple menu subpictures in DVDLab docs or in color scheme editor of DVDRemake. However google hints (not clearly) of multiple menu subpicture option in Encore DVD (I'm not giving direct link, it doesn't work for some reason), also mentioned in some guide for numenu4u.
So is it true that each of the 3 color schemes can use its own subpicture? Then the above menu type would work if odd/even buttons use 2 differrent color schemes.

[tinker]

I have seen this also, but I think the trick is that is only highlight region, but not overlapping highlight itself of the other button.

[Alex_ander]

Probably something like Emphasis 1/2 are used for masking odd/even buttons with different opacity settings in 2 color schemes and this prevents highlighting adjacent buttons.

[GTRBudda]

There's a post on Doom9 with some downloadable examples:
http://forum.doom9.org/showthread.php?t=104586
Uses PgcEdit , very cool

[Alex_ander]

Thanks for the link, then I was on the right way in just above post . This also can be done in DVDRemake which I mainly use. Also found a similar option in DLP manual (Color map chapter of help file). Different buttons can be individually assigned to one of the 3 graphic elements (Emphasis 1/2 or Pattern), probably this gives the same result.

[Alex_ander]

Now a more complicated question. Is it possible to make overlapping button graphics assigned to the 3 different 'Colors' (E1, E2, Pattern)? I suspect that those 'basic' colors only belong to abstraction layer of an authoring software like Scenarist, Muxman (full), etc. I don't think that single-layer subpicture bmp file (where can't be overlapping) is simply packed into sub stream, those applications internally separate images by color, then pack them. Other applications like Encore, can import E1, E2, Pattern by layer (layers are indexed to those colors before importing). So how are the (E1, E2, Pattern) stored in subpicture stream (like layers or like single picture), is it possible to use overlapping graphics for different color schemes?

P.S. Found the answer. I's impossible to have overlapping images, they are simply stored as 4-bit image (the four diff. pixel types are 0,1,2,3 numbers for the E1, E2, Pattern and bg).