wrong color count for subtitles.

[varokan]

Folks,

While creating subtitles I found that some images are counting 1 too
many colors.

I create subtitles in QDVDAuthor and all of them have 3 colors but for
some reason I get 4 colors counted when using spumux.

See image below. It has only 3 colors but spumux reports 4 colors on my
system.
http://qdvdauthor.sf.net/b.png

Now if I could solve this issue I could actually increase the color map
to 4 colors total. Any help is appreciated.

Varol  :)
Ps. I am using "Version: ImageMagick 6.2.5 04/09/06 Q16
http://www.imagemagick.org"
PPs. mtpaint is a nice tool to check the color count.


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[Ben Hutchings-3]

On Mon, 2006-12-25 at 16:06 -0500, Varol wrote:
> Folks,
>
> While creating subtitles I found that some images are counting 1 too
> many colors.
>
> I create subtitles in QDVDAuthor and all of them have 3 colors but for
> some reason I get 4 colors counted when using spumux.

Did you get dvdauthor from your distribution, from the Sourceforge
release, or from the darcs repository?

The Debian package includes a patch I made which will add transparency
to the palette if it's not already included and if there's a spare
palette entry.  I don't remember whether this adds to the reported
number of colours.

> See image below. It has only 3 colors but spumux reports 4 colors on my
> system.
> http://qdvdauthor.sf.net/b.png
>
> Now if I could solve this issue I could actually increase the color map
> to 4 colors total. Any help is appreciated.

Is this an issue?  Have you tried increasing the colour map to 4 colours
yet?

> Varol  :)
> Ps. I am using "Version: ImageMagick 6.2.5 04/09/06 Q16
> http://www.imagemagick.org"

This isn't the version number of dvdauthor/spumux but of one of the
libraries spumux uses.

Ben.

> PPs. mtpaint is a nice tool to check the color count.

--
Ben Hutchings
For every complex problem
there is a solution that is simple, neat, and wrong.


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[Scott Smith-8]

On 12/27/06, Ben Hutchings <ben@...> wrote:
> The Debian package includes a patch I made which will add transparency
> to the palette if it's not already included and if there's a spare
> palette entry.  I don't remember whether this adds to the reported
> number of colours.

why did you do that?
--
        Scott

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[Ben Hutchings-3]

On Sun, 2007-01-07 at 11:35 -0800, Scott Smith wrote:
> On 12/27/06, Ben Hutchings <ben@...> wrote:
> > The Debian package includes a patch I made which will add transparency
> > to the palette if it's not already included and if there's a spare
> > palette entry.  I don't remember whether this adds to the reported
> > number of colours.
>
> why did you do that?

I found that my Panasonic standalone player and one of the software
players (I forget which) would sometimes add a narrow strip of colour 0
along the bottom and right of subpictures.  At a guess they may be
padding to a multiple of 2 pixels.  Usually colour 0 will be whatever
colour is at the top left pixel of the subpicture and that's a border or
background colour that's also present on the right and bottom edges, so
this isn't noticeable.  When that isn't the case, it becomes obvious.

Ben.

--
Ben Hutchings
For every complex problem
there is a solution that is simple, neat, and wrong.


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[Scott Smith-8]

On 1/7/07, Ben Hutchings <ben@...> wrote:
> I found that my Panasonic standalone player and one of the software
> players (I forget which) would sometimes add a narrow strip of colour 0
> along the bottom and right of subpictures.  At a guess they may be
> padding to a multiple of 2 pixels.  Usually colour 0 will be whatever
> colour is at the top left pixel of the subpicture and that's a border or
> background colour that's also present on the right and bottom edges, so
> this isn't noticeable.  When that isn't the case, it becomes obvious.

I have heard of the multiple-of-2 issue, but I haven't (yet) coded
that in as a requirement (or a warning).  Yeah, the specific colors
have meaning, which spumux does not allow you to set.  I always
wondered if that mattered or not.  Guess it does...
--
        Scott

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[Scott Smith-8]

On 1/7/07, Ben Hutchings <ben@...> wrote:
> I found that my Panasonic standalone player and one of the software
> players (I forget which) would sometimes add a narrow strip of colour 0
> along the bottom and right of subpictures.  At a guess they may be
> padding to a multiple of 2 pixels.  Usually colour 0 will be whatever
> colour is at the top left pixel of the subpicture and that's a border or
> background colour that's also present on the right and bottom edges, so
> this isn't noticeable.  When that isn't the case, it becomes obvious.

I noticed my Pioneer will add a strip of color 0 if the bottom Y
coordinate is odd.  I just made it a warning if you use odd Y
coordinates.  I'm surprised about it happening on the right edge
though.  Can you test what happens if you make your X coordinates
even?  Does that cause the problem to go away?
--
        Scott

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