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How to prevent "colour level" from going up?

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lapsap7+vnc at gmail

Mar 17, 2009, 1:47 PM

Post #1 of 9 (2628 views)
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How to prevent "colour level" from going up?

I just don't understand: in my VNC file it's specified that I use "Low
(64 colours)" as "Colour Level" (because of low bandwidth). But once the
whole screen is drawn, VNC (don't know if it's the client or the server)
just keeps on "upgrading" the "Colour Level"!!!

Why I can't specify the colour level?
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alexp at broadcom

Mar 17, 2009, 2:27 PM

Post #2 of 9 (2510 views)
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Re: How to prevent "colour level" from going up? [In reply to]

You need to uncheck Auto Select checkbox for encoding and select
encoding. Then color level will stop changing. I think this is bug in
vnc viewer but it is consistent across all viewers - free to EE.

Regards,
Alex

Seak, Teng-Fong wrote:
> I just don't understand: in my VNC file it's specified that I use "Low
> (64 colours)" as "Colour Level" (because of low bandwidth). But once the
> whole screen is drawn, VNC (don't know if it's the client or the server)
> just keeps on "upgrading" the "Colour Level"!!!
>
> Why I can't specify the colour level?
> _______________________________________________
> VNC-List mailing list
> VNC-List [at] realvnc
> To remove yourself from the list visit:
> http://www.realvnc.com/mailman/listinfo/vnc-list
>
>
_______________________________________________
VNC-List mailing list
VNC-List [at] realvnc
To remove yourself from the list visit:
http://www.realvnc.com/mailman/listinfo/vnc-list

jnw at realvnc

Mar 18, 2009, 7:04 AM

Post #3 of 9 (2514 views)
Permalink

RE: How to prevent "colour level" from going up? [In reply to]

Hi Alex,

The feature of increasing the colour-level automatically when Auto-Select is
enabled and the Line-Speed Estimate is fast enough to support full-colour
operation is by-design.

What isn't clear is why Seak Teng-Fong's viewer is detecting a fast connection
if in fact the connection is low-bandwidth.

Regards,

--
Wez @ RealVNC Ltd

> -----Original Message-----
> From: vnc-list-admin [at] realvnc [mailto:vnc-list-admin [at] realvnc] On
> Behalf Of Alex Pelts
> Sent: 17 March 2009 21:28
> To: Seak, Teng-Fong
> Cc: vnc-list [at] realvnc
> Subject: Re: How to prevent "colour level" from going up?
>
> You need to uncheck Auto Select checkbox for encoding and select
> encoding. Then color level will stop changing. I think this is bug in
> vnc viewer but it is consistent across all viewers - free to EE.
>
> Regards,
> Alex
>
>
> Seak, Teng-Fong wrote:
> > I just don't understand: in my VNC file it's specified that I
> use "Low
> > (64 colours)" as "Colour Level" (because of low bandwidth). But once
> the
> > whole screen is drawn, VNC (don't know if it's the client or the
> server)
> > just keeps on "upgrading" the "Colour Level"!!!
> >
> > Why I can't specify the colour level?
> > _______________________________________________
> > VNC-List mailing list
> > VNC-List [at] realvnc
> > To remove yourself from the list visit:
> > http://www.realvnc.com/mailman/listinfo/vnc-list
> >
> >
> _______________________________________________
> VNC-List mailing list
> VNC-List [at] realvnc
> To remove yourself from the list visit:
> http://www.realvnc.com/mailman/listinfo/vnc-list
_______________________________________________
VNC-List mailing list
VNC-List [at] realvnc
To remove yourself from the list visit:
http://www.realvnc.com/mailman/listinfo/vnc-list

alexp at broadcom

Mar 18, 2009, 9:02 AM

Post #4 of 9 (2500 views)
Permalink

Re: How to prevent "colour level" from going up? [In reply to]

James,
It is possible that the feature is by design but please note following:
1. There are 2 sets of radio buttons on that tab - Preferred encoding
and Color Level
2. If you select Auto Select check box Preferred encoding becomes
disabled. Which means you cant control it and it is automatically selected.
3. The Color Level you can set to some value which means that you should
be able to select Color Level
4. In fact if you select Auto Select the Color level will be reverted to
what viewer decides every time. This makes not graying out Color Level
pointless.

Regards,
Alex

James Weatherall wrote:
> Hi Alex,
>
> The feature of increasing the colour-level automatically when Auto-Select is enabled and the Line-Speed Estimate is fast enough to support full-colour operation is by-design.
>
> What isn't clear is why Seak Teng-Fong's viewer is detecting a fast connection if in fact the connection is low-bandwidth.
>
> Regards,
>
> --
> Wez @ RealVNC Ltd
>
>
>
>> -----Original Message-----
>> From: vnc-list-admin [at] realvnc [mailto:vnc-list-admin [at] realvnc] On
>> Behalf Of Alex Pelts
>> Sent: 17 March 2009 21:28
>> To: Seak, Teng-Fong
>> Cc: vnc-list [at] realvnc
>> Subject: Re: How to prevent "colour level" from going up?
>>
>> You need to uncheck Auto Select checkbox for encoding and select
>> encoding. Then color level will stop changing. I think this is bug in
>> vnc viewer but it is consistent across all viewers - free to EE.
>>
>> Regards,
>> Alex
>>
>>
>> Seak, Teng-Fong wrote:
>>
>>> I just don't understand: in my VNC file it's specified that I
>>>
>> use "Low
>>
>>> (64 colours)" as "Colour Level" (because of low bandwidth). But once
>>>
>> the
>>
>>> whole screen is drawn, VNC (don't know if it's the client or the
>>>
>> server)
>>
>>> just keeps on "upgrading" the "Colour Level"!!!
>>>
>>> Why I can't specify the colour level?
>>> _______________________________________________
>>> VNC-List mailing list
>>> VNC-List [at] realvnc
>>> To remove yourself from the list visit:
>>> http://www.realvnc.com/mailman/listinfo/vnc-list
>>>
>>>
>>>
>> _______________________________________________
>> VNC-List mailing list
>> VNC-List [at] realvnc
>> To remove yourself from the list visit:
>> http://www.realvnc.com/mailman/listinfo/vnc-list
>>
>
>
>
_______________________________________________
VNC-List mailing list
VNC-List [at] realvnc
To remove yourself from the list visit:
http://www.realvnc.com/mailman/listinfo/vnc-list

jnw at realvnc

Mar 18, 2009, 9:09 AM

Post #5 of 9 (2503 views)
Permalink

RE: How to prevent "colour level" from going up? [In reply to]

Hi Alex,

The Colour Level remains selectable so that the user can choose which of the
Low Colour levels to use for slow connections, or opt to force the session to
run in Full Colour even when the connection is slow. The Auto-Select feature
always controls the encoding when enabled, since the choice of encoding does
not affect the quality of desktop imagery in current releases.

Note that the latest VNC Enterprise Edition Viewer releases simplify selection
of colour level and encoding.

Regards,

--
Wez @ RealVNC Ltd

> -----Original Message-----
> From: Alex Pelts [mailto:alexp [at] broadcom]
> Sent: 18 March 2009 16:03
> To: james.weatherall [at] realvnc
> Cc: 'Seak, Teng-Fong'; vnc-list [at] realvnc
> Subject: Re: How to prevent "colour level" from going up?
>
> James,
> It is possible that the feature is by design but please note following:
> 1. There are 2 sets of radio buttons on that tab - Preferred encoding
> and Color Level
> 2. If you select Auto Select check box Preferred encoding becomes
> disabled. Which means you cant control it and it is automatically
> selected.
> 3. The Color Level you can set to some value which means that you
> should
> be able to select Color Level
> 4. In fact if you select Auto Select the Color level will be reverted
> to
> what viewer decides every time. This makes not graying out Color Level
> pointless.
>
> Regards,
> Alex
>
>
> James Weatherall wrote:
> > Hi Alex,
> >
> > The feature of increasing the colour-level automatically when Auto-
> Select is enabled and the Line-Speed Estimate is fast enough to support
> full-colour operation is by-design.
> >
> > What isn't clear is why Seak Teng-Fong's viewer is detecting a fast
> connection if in fact the connection is low-bandwidth.
> >
> > Regards,
> >
> > --
> > Wez @ RealVNC Ltd
> >
> >
> >
> >> -----Original Message-----
> >> From: vnc-list-admin [at] realvnc [mailto:vnc-list-admin [at] realvnc]
> On
> >> Behalf Of Alex Pelts
> >> Sent: 17 March 2009 21:28
> >> To: Seak, Teng-Fong
> >> Cc: vnc-list [at] realvnc
> >> Subject: Re: How to prevent "colour level" from going up?
> >>
> >> You need to uncheck Auto Select checkbox for encoding and select
> >> encoding. Then color level will stop changing. I think this is bug
> in
> >> vnc viewer but it is consistent across all viewers - free to EE.
> >>
> >> Regards,
> >> Alex
> >>
> >>
> >> Seak, Teng-Fong wrote:
> >>
> >>> I just don't understand: in my VNC file it's specified that I
> >>>
> >> use "Low
> >>
> >>> (64 colours)" as "Colour Level" (because of low bandwidth). But
> once
> >>>
> >> the
> >>
> >>> whole screen is drawn, VNC (don't know if it's the client or the
> >>>
> >> server)
> >>
> >>> just keeps on "upgrading" the "Colour Level"!!!
> >>>
> >>> Why I can't specify the colour level?
> >>> _______________________________________________
> >>> VNC-List mailing list
> >>> VNC-List [at] realvnc
> >>> To remove yourself from the list visit:
> >>> http://www.realvnc.com/mailman/listinfo/vnc-list
> >>>
> >>>
> >>>
> >> _______________________________________________
> >> VNC-List mailing list
> >> VNC-List [at] realvnc
> >> To remove yourself from the list visit:
> >> http://www.realvnc.com/mailman/listinfo/vnc-list
> >>
> >
> >
> >
_______________________________________________
VNC-List mailing list
VNC-List [at] realvnc
To remove yourself from the list visit:
http://www.realvnc.com/mailman/listinfo/vnc-list

lapsap7+vnc at gmail

Mar 19, 2009, 7:00 AM

Post #6 of 9 (2489 views)
Permalink

Re: How to prevent "colour level" from going up? [In reply to]

To Alex,

OIC. Yes, I agree with you that it's quite a bug (of design). I would
expect another "Auto Select" check-box on top of the column of "Colour
Level". What encoding is best to use, by the way? I figure that I'd better
not using "Raw" as this increases the quantity of data transferring from
server to client. But what to choose between "ZRLE" and "Hextile"? Both
are compressed data?

To James,

Sorry, I lied when I said it's over a low bandwidth :p To the
contrary, it's actually over a high bandwidth, but .... there're situations
where it's better to consider *as if* we're using low bandwidth. Eg
1. It's possible to have 1Mbit/s up to 7Mbit/s using 3G mobile access to
Internet. However, it's quite often that such access is on a
pay-per-megabyte basis, ie what you pay depends on the quantity of data
transfered. So it's quite natural to reduce the colour level as much as
possible.
2. In my home, my Internet access is also high bandwidth, but I notice that
the data transfer is like sort of pulses, ie during some seconds, data are
transferred, but during the next few seconds, it's as if nothing's got
through. So in average, the bandwidth is quite low.

Back to my original post,

I had done like this: established a connection, changed the Colour
Level to low, save the config to a VNC file, and re-open the connection by
double-clicking the VNC file. But the Colour Level is still set back to
high after a few seconds, and then due to the "pulse" problem I mentioned
before, VNC connection is very slow.

On Wed, Mar 18, 2009 at 5:09 PM, James Weatherall <jnw [at] realvnc> wrote:

> Hi Alex,
>
> The Colour Level remains selectable so that the user can choose which of
> the Low Colour levels to use for slow connections, or opt to force the
> session to run in Full Colour even when the connection is slow. The
> Auto-Select feature always controls the encoding when enabled, since the
> choice of encoding does not affect the quality of desktop imagery in current
> releases.
>
> Note that the latest VNC Enterprise Edition Viewer releases simplify
> selection of colour level and encoding.
>
> Regards,
>
> --
> Wez @ RealVNC Ltd
>
_______________________________________________
VNC-List mailing list
VNC-List [at] realvnc
To remove yourself from the list visit:
http://www.realvnc.com/mailman/listinfo/vnc-list

jnw at realvnc

Mar 20, 2009, 3:38 AM

Post #7 of 9 (2494 views)
Permalink

RE: How to prevent "colour level" from going up? [In reply to]

Seak,

Thanks for the feedback. The Auto-Select behaviour is specifically designed
to switch up the colour level but not back down again. As you point out, this
doesn't work so well if your connection has short-lived periods of high
throughput but low throughput more normally. In this case you should disable
the Auto-Select feature and manually select the compression & colour level.
The latest VNC Enterprise and Personal Edition viewers have a new, easier to
use interface for this.

HTH,

--
Wez @ RealVNC Ltd

> -----Original Message-----
> From: vnc-list-admin [at] realvnc [mailto:vnc-list-admin [at] realvnc] On
> Behalf Of Seak, Teng-Fong
> Sent: 19 March 2009 14:00
> To: vnc-list [at] realvnc
> Subject: Re: How to prevent "colour level" from going up?
>
> To Alex,
>
> OIC. Yes, I agree with you that it's quite a bug (of design). I
> would
> expect another "Auto Select" check-box on top of the column of "Colour
> Level". What encoding is best to use, by the way? I figure that I'd
> better
> not using "Raw" as this increases the quantity of data transferring
> from
> server to client. But what to choose between "ZRLE" and "Hextile"?
> Both
> are compressed data?
>
> To James,
>
> Sorry, I lied when I said it's over a low bandwidth :p To the
> contrary, it's actually over a high bandwidth, but .... there're
> situations
> where it's better to consider *as if* we're using low bandwidth. Eg
> 1. It's possible to have 1Mbit/s up to 7Mbit/s using 3G mobile access
> to
> Internet. However, it's quite often that such access is on a
> pay-per-megabyte basis, ie what you pay depends on the quantity of data
> transfered. So it's quite natural to reduce the colour level as much
> as
> possible.
> 2. In my home, my Internet access is also high bandwidth, but I notice
> that
> the data transfer is like sort of pulses, ie during some seconds, data
> are
> transferred, but during the next few seconds, it's as if nothing's got
> through. So in average, the bandwidth is quite low.
>
> Back to my original post,
>
> I had done like this: established a connection, changed the Colour
> Level to low, save the config to a VNC file, and re-open the connection
> by
> double-clicking the VNC file. But the Colour Level is still set back
> to
> high after a few seconds, and then due to the "pulse" problem I
> mentioned
> before, VNC connection is very slow.
>
>
>
> On Wed, Mar 18, 2009 at 5:09 PM, James Weatherall <jnw [at] realvnc>
> wrote:
>
> > Hi Alex,
> >
> > The Colour Level remains selectable so that the user can choose which
> of
> > the Low Colour levels to use for slow connections, or opt to force
> the
> > session to run in Full Colour even when the connection is slow. The
> > Auto-Select feature always controls the encoding when enabled, since
> the
> > choice of encoding does not affect the quality of desktop imagery in
> current
> > releases.
> >
> > Note that the latest VNC Enterprise Edition Viewer releases simplify
> > selection of colour level and encoding.
> >
> > Regards,
> >
> > --
> > Wez @ RealVNC Ltd
> >
> _______________________________________________
> VNC-List mailing list
> VNC-List [at] realvnc
> To remove yourself from the list visit:
> http://www.realvnc.com/mailman/listinfo/vnc-list
_______________________________________________
VNC-List mailing list
VNC-List [at] realvnc
To remove yourself from the list visit:
http://www.realvnc.com/mailman/listinfo/vnc-list

lapsap7+vnc at gmail

Mar 20, 2009, 3:46 AM

Post #8 of 9 (2497 views)
Permalink

Re: How to prevent "colour level" from going up? [In reply to]

OK, thank you. I'll try. :)

On Fri, Mar 20, 2009 at 11:38 AM, James Weatherall <jnw [at] realvnc> wrote:

> Seak,
>
> Thanks for the feedback. The Auto-Select behaviour is specifically
> designed to switch up the colour level but not back down again. As you
> point out, this doesn't work so well if your connection has short-lived
> periods of high throughput but low throughput more normally. In this case
> you should disable the Auto-Select feature and manually select the
> compression & colour level. The latest VNC Enterprise and Personal Edition
> viewers have a new, easier to use interface for this.
>
> HTH,
>
> --
> Wez @ RealVNC Ltd
>
_______________________________________________
VNC-List mailing list
VNC-List [at] realvnc
To remove yourself from the list visit:
http://www.realvnc.com/mailman/listinfo/vnc-list

lapsap7+vnc at gmail

Apr 4, 2009, 3:16 AM

Post #9 of 9 (2350 views)
Permalink

Re: How to prevent "colour level" from going up? [In reply to]

OK, I'm back on this matter. I've downloaded the personal edition and
it's a lot better. I set the compression/colour level to the maximum of 64
colours. Now, my VNC server is a LOT more responsive than before.

Thanks :)

On Fri, Mar 20, 2009 at 12:38 PM, James Weatherall <jnw [at] realvnc> wrote:

> Seak,
>
> Thanks for the feedback. The Auto-Select behaviour is specifically
> designed to switch up the colour level but not back down again. As you
> point out, this doesn't work so well if your connection has short-lived
> periods of high throughput but low throughput more normally. In this case
> you should disable the Auto-Select feature and manually select the
> compression & colour level. The latest VNC Enterprise and Personal Edition
> viewers have a new, easier to use interface for this.
>
> HTH,
>
> --
> Wez @ RealVNC Ltd
>
_______________________________________________
VNC-List mailing list
VNC-List [at] realvnc
To remove yourself from the list visit:
http://www.realvnc.com/mailman/listinfo/vnc-list

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