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http://nfggames.com/games/ntsc/visual.shtm
Summary: You really don't see blue very well.
--
Darren New, San Diego CA, USA (PST)
There's no CD like OCD, there's no CD I knoooow!
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From: nemesis
Subject: Re: Very interesting color resolution examples
Date: 26 Apr 2009 14:29:26
Message: <49f4a806@news.povray.org>
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Darren New wrote:
> http://nfggames.com/games/ntsc/visual.shtm
>
> Summary: You really don't see blue very well.
Would that still hold true in a blue-shaded scene? :P
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On 4/26/2009 11:40 AM, nemesis wrote:
> Darren New wrote:
>> http://nfggames.com/games/ntsc/visual.shtm
>>
>> Summary: You really don't see blue very well.
>
> Would that still hold true in a blue-shaded scene? :P
Give it a try and post the resulting images. I'm betting that, yes, it
would still hold true.
--
...Chambers
www.pacificwebguy.com
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"nemesis" <nam### [at] nospam-gmail com> wrote in message
news:49f4a806@news.povray.org...
> Darren New wrote:
> > http://nfggames.com/games/ntsc/visual.shtm
> > Summary: You really don't see blue very well.
> Would that still hold true in a blue-shaded scene? :P
http://nfggames.com/games/ntsc/traci_blue3.png
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From: nemesis
Subject: Re: Very interesting color resolution examples
Date: 26 Apr 2009 17:50:05
Message: <49f4d70d@news.povray.org>
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somebody wrote:
> "nemesis" <nam### [at] nospam-gmailcom> wrote in message
>> Would that still hold true in a blue-shaded scene? :P
>
> http://nfggames.com/games/ntsc/traci_blue3.png
Funny, but you know that's just a component.
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Chambers wrote:
> On 4/26/2009 11:40 AM, nemesis wrote:
>> Darren New wrote:
>>> http://nfggames.com/games/ntsc/visual.shtm
>>>
>>> Summary: You really don't see blue very well.
>>
>> Would that still hold true in a blue-shaded scene? :P
>
> Give it a try and post the resulting images. I'm betting that, yes, it
> would still hold true.
Well, turns out it's true, yes:
http://www.fileshost.com/download.php?id=BF214D771
It's a gimp file with a decomposed image of a bird in additive layers.
You may select which ones to view.
Very counter-intuitive. OTOH, it's kind of comforting it is not in our
nature to feel blue. ;)
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From: somebody
Subject: Re: Very interesting color resolution examples
Date: 26 Apr 2009 18:20:23
Message: <49f4de27@news.povray.org>
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"nemesis" <nam### [at] nospam-gmailcom> wrote in message
news:49f4d70d@news.povray.org...
> somebody wrote:
> > "nemesis" <nam### [at] nospam-gmailcom> wrote in message
> >> Would that still hold true in a blue-shaded scene? :P
> > http://nfggames.com/games/ntsc/traci_blue3.png
> Funny, but you know that's just a component.
It may be a component, but it also is an _image_ with only blues...
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From: scott
Subject: Re: Very interesting color resolution examples
Date: 27 Apr 2009 02:37:54
Message: <49f552c2@news.povray.org>
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> http://nfggames.com/games/ntsc/visual.shtm
>
> Summary: You really don't see blue very well.
I wonder if it is more that you don't see *colour* very well compared to
brightness, not blue compared to green? It just so happens that the green
channel carries almost all of the brightness information compared to blue.
To test this out you could split into Yuv colour space (or similar) and
reduce the resolution of the u and v channels, I suspect then you could get
away with compressing green colours just as much as blue ones, so long as
the Y (brightness) channel remained at the original quality.
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"scott" <sco### [at] scottcom> wrote:
> > http://nfggames.com/games/ntsc/visual.shtm
> >
> > Summary: You really don't see blue very well.
>
> I wonder if it is more that you don't see *colour* very well compared to
> brightness, not blue compared to green?
I remember once seeing the sun's power spectrum compared to the eye's response
spectrum, possibly at uni. The eye's spectrum follows the sun's very closely -
not suprising considering we evolved under its glare. This of course means that
we are far more sensitive to green light than red or blue, which are at the far
extremes of the visible range. I can't seem to find any refs for this
comparison, but there is a phototopic luminosity function on w'pedia:
http://en.wikipedia.org/wiki/Luminosity_function
....so this probably isn't cutting-edge news... still interesting to see it
demonstrated this way though.
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>> >> Would that still hold true in a blue-shaded scene? :P
>
>> > http://nfggames.com/games/ntsc/traci_blue3.png
>
>> Funny, but you know that's just a component.
>
> It may be a component, but it also is an _image_ with only blues...
And hence is much much darker than an image with only greens.
Try adjusting the brightness of the green one to match the blue (I found
multiplying by 0.3 did it here), then compare side-by-side, now there's not
so much visible difference...
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