Here is the default Red Filter in CS4:
Reds 120%
Yellows 110%
Greens -10%
Cyans -50%
Blues 0%
Magentas 120%
Result:
http://www.accura.com.hk/temp/IMG_2587_BW_Red.jpg
Here is the default B/W Filter in CS4
Reds 40%
Yellows 60%
Greens 40%
Cyans 60%
Blues 20%
Magentas 80%
Result:
http://www.accura.com.hk/temp/IMG_2587_BW.jpg
Actually, similar problem happen on 10D and 40D too, it could be the problem
of CS4.
C.H.Ling
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
> CH was complaining about his 5D Mk II, not his original 5D. Moose and I
> are still with the 5D. I did not see the noise that CH and Moose say
> they can see. At 100% magnification I see pixelization in CH's image
> which ACR's noise control can eliminate. Whether the pixelization is
> dispensed with or not I see posterization (but not noise) after reducing
> the size to about 50% or less and after turning off every color except
> pure red in ACR's B&W converter. If I have only pure red available in a
> JPEG image I have (at most) 256 shades of gray. That to me is the
> probable source of the posterization although there are never more than
> 256 shades of gray in a B&W JPEG. Perhaps the Bayer pattern is a
> problem if all the blue and green pixels are totally eliminated? If I
> return blue to the halfway point the posterization goes away.
>
> Actually, after mentioning "half way point" I realized that perhaps I'm
> the problem. The half way point is zero. In turning the red channel to
> +100% and everything else to -100% perhaps I've boosted half of the red
> pixels to the point of being blown out. I've never much paid attention
> to what the scales on those sliders actually mean. Just push them
> around until I get something I like.
>
> Chuck Norcutt
>
>
> Ken Norton wrote:
>> I don't understand something. How can we have three 5D owners not
>> agree about noise patterns in their cameras?
>>
>> AG
--
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