"Trevor G Quayle" <Tin### [at] hotmailcom> schreef in bericht 
news:web.4d84e377f5e1e8f8b05ef170@news.povray.org...
> Some adjustments to my scene.  Tweaked the projector lighting a bit to get 
> the
> falloff I wanted, added just a touch of fill-type lighting from the 
> projector
> beam.  Adjusted the textures a little bit as well, added some specular to 
> the
> skin and a fine quilted texture to the seats.  I will probably try a 
> different
> seat texture as I don't have it uv mapped so it comes out with some 
> moire-like
> artifacting.
>

I don't see anything... Gamma?

Thomas

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Am 20.03.2011 09:04, schrieb Thomas de Groot:

> I don't see anything... Gamma?

Looks more like an absolute brightness issue to me.

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clipka <ano### [at] anonymousorg> wrote:
> Am 20.03.2011 09:04, schrieb Thomas de Groot:
>
> > I don't see anything... Gamma?
>
> Looks more like an absolute brightness issue to me.

I have been having difficulty calibrating my home monitor, so this image was
visible to me at my previous settings.
I have tried to do some calibration, and I think I have my monitor gamma setting
way too high.

I'm going to have to try to figure some of this out, but it is difficult to find
a difinite source to help me get the settings correct.

-tgq

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On 20/03/2011 7:19 PM, Trevor G Quayle wrote:
> clipka<ano### [at] anonymousorg>  wrote:
>> Am 20.03.2011 09:04, schrieb Thomas de Groot:
>>
>>> I don't see anything... Gamma?
>>
>> Looks more like an absolute brightness issue to me.
>
> I have been having difficulty calibrating my home monitor, so this image was
> visible to me at my previous settings.
> I have tried to do some calibration, and I think I have my monitor gamma setting
> way too high.
>
> I'm going to have to try to figure some of this out, but it is difficult to find
> a difinite source to help me get the settings correct.
>
> -tgq
>
To me the front row and projector beam are clearly visible if a bit 
dark. If I adjust the gamma from 1 to 1.1 then the backsplash from the 
projector beam becomes obvious as a circle of light on the back wall.

-- 
Regards
     Stephen

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"Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> clipka <ano### [at] anonymousorg> wrote:
> > Am 20.03.2011 09:04, schrieb Thomas de Groot:
> >
> > > I don't see anything... Gamma?
> >
> > Looks more like an absolute brightness issue to me.
>
> I have been having difficulty calibrating my home monitor, so this image was
> visible to me at my previous settings.
> I have tried to do some calibration, and I think I have my monitor gamma setting
> way too high.
>
> I'm going to have to try to figure some of this out, but it is difficult to find
> a difinite source to help me get the settings correct.
>
> -tgq

Hopefully this is much better.  I tried to do some calibration with my monitor.

-tgq

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Attachments:
Download 'matineescene-4.jpg' (160 KB)

Preview of image 'matineescene-4.jpg'

"Trevor G Quayle" <Tin### [at] hotmailcom> schreef in bericht 
news:web.4d868898f5e1e8f8b05ef170@news.povray.org...
> Hopefully this is much better.  I tried to do some calibration with my 
> monitor.

Oh yes! This looks *correct* to me. Good work.

Thomas

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> Hopefully this is much better.

   Definitely.

> I tried to do some calibration with my monitor.

It looks you at least calibrated it decently: the lighting level is now
what I would expect for such situation.



-- 
Jaime Vives Piqueres
		
La Persistencia de la Ignorancia
http://www.ignorancia.org

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Am 21.03.2011 00:07, schrieb Trevor G Quayle:

> Hopefully this is much better.

Hmm, it *is* brighter but I'm not so sure about *better*.
You have some quite distracting color banding on the rear wall and you 
are completely loosing the dim movie theater feeling here.
The main problems within your previous version seems to me: almost 50% 
of the pixels are pitch black (rgb 0,0,0) and plain black pixels is 
something that should (for photorealistic images) be avoided like the 
plague.
Even within this brighter version are almost 25% pixels just black (the 
upper walls, ceiling, the pylons, the speakers and parts below the seats).
On the over hand you are not using the full dynamic range which makes it 
look somehow flat. There is no need to make it overall brighter but 
there is some need for bright spots.


> I tried to do some calibration with my monitor.

See my 'Calibration' post, it might help.

-Ive

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Ive <ive### [at] lilysoftorg> wrote:
> You have some quite distracting color banding on the rear wall and you

I've noticed this.  This looks like it is coming from the very dim 'fill'
lighting I am using along part of the projector beam.  The light intensity is
right near the bottom of the colour depth so it tends to get stepped.  I tried
it with HDR image type output and the banding disappears (converting the HDR
back to JPG or PNG reintroduces it).  I may either have to adjust how I approach
this light, adjust the texturing to better mask it, or just get rid of it
completely.

> The main problems within your previous version seems to me: almost 50%
> of the pixels are pitch black (rgb 0,0,0) and plain black pixels is
> something that should (for photorealistic images) be avoided like the
> plague.
> Even within this brighter version are almost 25% pixels just black (the
> upper walls, ceiling, the pylons, the speakers and parts below the seats).

There is a very good reason for this:  durrently those particular parts have a
'rgb 0' pigment attached.


> > I tried to do some calibration with my monitor.
>
> See my 'Calibration' post, it might help.
>
> -Ive

Helps a little.  I think the big problem before was my monitor gamma was bumped
way too high.  However the brightness setting is something I could not find a
lot of information on previously.  When calibrating before and fixing the gamma,
I had bumped this right down (0%), but using your posting I have it somewhat
higher (40%).


-tgq

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Am 21.03.2011 14:37, schrieb Trevor G Quayle:
> Ive<ive### [at] lilysoftorg>  wrote:
>> You have some quite distracting color banding on the rear wall and you
>
> I've noticed this.  This looks like it is coming from the very dim 'fill'
> lighting I am using along part of the projector beam.  The light intensity is
> right near the bottom of the colour depth so it tends to get stepped.  I tried
> it with HDR image type output and the banding disappears (converting the HDR
> back to JPG or PNG reintroduces it).  I may either have to adjust how I approach
> this light, adjust the texturing to better mask it, or just get rid of it
> completely.

For a PNG file without colour banding, you may want to use dithered 
output (+TH). (You can also try it for JPG, though I'm not sure whether 
that will improve results.)

Alternatively, you can convert the HDR or EXR output using Ive's "IC" 
("Image Converter", see http://www.lilysoft.org/IC/ic_index.htm), which 
does a much better job at avoiding color banding than most other image 
manipulation/conversion software.

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