Help about SDL abnormal color display in VNC viewer.

[James Weatherall]

Alex,

I'm afraid that I can't find any such post to this mailing list.  If the red
& blue components are swapped in an application then that does invariably
mean that the application is ignoring the actual format of depth-24 pixels,
and assuming an RGB format, while Xvnc currently defaults to BGR (for
historical reasons).

Cheers,

--
Wez @ RealVNC Ltd
 

> -----Original Message-----
> From: vnc-list-admin "at" realvnc.com 
> [mailto:vnc-list-admin "at" realvnc.com] On Behalf Of Alex Chen
> Sent: 08 April 2008 02:56
> To: dongxiao.xu "at" gmail.com
> Cc: vnc-list "at" realvnc.com
> Subject: Re: Help about SDL abnormal color display in VNC viewer.
> 
> Hi DongXiao,
> 
> I have met a similar issue but I am not sure whether it is 
> exactly same.
> please find "It seems SDL exchanges R & B channels, but turn 
> out VNC related" topic in the list, hope it could help you
> 
> --Alex
> 
> On 4/3/08, James Weatherall <jnw "at" realvnc.com> wrote:
> >
> > Paresh,
> >
> > I'm afraid that you are mistaken.  What I described is the VNC 
> > Viewer's Low Colour feature, used by default for slow connections.
> >
> > The XRANDR extension affects the size of the X desktop, its 
> rotation, 
> > and in the latest spec the positions of physical display devices' 
> > viewports.  It doesn't affect the X desktop's colours, so 
> I'm not sure 
> > why you think XRANDR is causing whatever "weird colours" you're 
> > seeing.
> >
> > What is the "VNC session window resize problem" that you refer to?
> >
> >
> > --
> > Wez @ RealVNC Ltd
> >
> >
> > > -----Original Message-----
> >
> > > From: paresh masani [mailto:masaniparesh "at" gmail.com]
> > > Sent: 03 April 2008 16:19
> > > To: James Weatherall
> >
> > > Cc: Xu Dongxiao; vnc-list "at" realvnc.com
> > > Subject: Re: Help about SDL abnormal color display in VNC viewer.
> > >
> > > Hi,
> > >
> > > This happens for me as well if i open my VNC session of other 
> > > monitor which will have monitor size different. It is 
> showing weird 
> > > colors.Could anyone suggest regarding this issue? Is it 
> related to 
> > > 24 bit color problem?
> > >
> > > I think this is happening because of the VNC session 
> window resize 
> > > problem and current VNC dont have XRANDR supports.
> > >
> > > Thanks,
> > > Paresh
> > >
> > >
> > > On 4/3/08, James Weatherall <jnw "at" realvnc.com> wrote:
> > >
> > >       Hi again,
> > >
> > >       Sorry - one other thing I forgot to mention is that 
> if you are 
> > > connecting to
> > >       your VNC Server over a slow link then it will use a reduced 
> > > colour level,
> > >       which may lead to colours being approximated by a 
> more limited 
> > > palette.  You
> > >       should configure your VNC Viewer to use "full-colour"
> > > if you need to see
> > >       exact colours.
> > >
> > >       Regards,
> > >
> > >       --
> > >       Wez @ RealVNC Ltd
> > >
> > >
> > >       > -----Original Message-----
> > >       > From: Xu Dongxiao [mailto:dongxiao.xu "at" gmail.com]
> > >       > Sent: 03 April 2008 14:57
> > >       > To: James Weatherall
> > >       > Cc: vnc-list "at" realvnc.com
> > >       > Subject: Re: Help about SDL abnormal color display in VNC 
> > > viewer.
> > >       >
> > >       > Hi, James,
> > >       >     Thanks for your reply!
> > >       >     I have put the picture on this website:
> > >       > http://bbs.nju.edu.cn/file/P/prece/color.jpg
> > >       >     I also swap the red color and blue color on the above
> > >       > image, but the color is still not correct.
> > >       >
> > >       > Best Regards,
> > >       > Xu Dongxiao
> > >       _______________________________________________
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> > >
> > >
> > >
> > >
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