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Posted by Gene E. Bloch on 11/22/05 23:03
On 11/22/2005, Rab managed to type:
> "Eric Gisin" <ericgisin@hotmail.com> wrote in message
> news:dll0aq02nmf@enews2.newsguy.com...
>> http://www.denguru.com/2005/11/17/getting_what_you_don/page2.html
>>
>> This article is full of errors, just like most others. Here are some:
>>
>> So four samples of black and white are sent down in a signal burst,
>> followed by two samples of blue and one of red, ...
>> [4:2:0 has 1 each U and V per 4 Y=luminence]
>>
>> Both MPEG-2 (DVD's codec) and MPEG-4 (likely used in HD-DVD and Blu-Ray)
>> use 4:2:0 formatting
>> [isn't 4:2:2 an option?]
>>
>> While dogs can only see in black and white, ... [mammals see in colour]
>>
>> Here is a better article on Chroma Upsampling Error :
>> www.hometheaterhifi.com/volume_8_2/dvd-benchmark-special-report-chroma-bug-4-2001.html
>>
>> Has anyone rated the major Windows DVD MPEG-2 decoders on quality?
>>
>>
>
> I was always taught that dogs could only see in black and white - anyhow it
> seems that dogs are said to have dichromatic vision -- they can see only part
> of the range of colours in the visual spectrum of light wavelengths. They see
> in shades of yellow and blue.
To add to Rab's remarks:
I also was always taught that dogs & cats saw only in black and white.
Then, a few years ago, I read that the scientists had designed better
experiments, and thereby learned that cats & dogs do see in color,
though not as well as people. I didn't remember - or never knew - that
that was because their color vision was only two colors, unlike our
three-color vision. BTW, I have read that some critters have four-color
vision. Insects, IIRC, or is it birds? Psychedelic :-)
Supposedly the original experiments either bored the animals, or they
were too difficult for the animals, or something like that...
I wonder what they'll be saying in five or ten years on this subject.
Gino
--
Gene E. Bloch (Gino)
letters617blochg3251
(replace the numbers by "at" and "dotcom")
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