On 5/25/2010 1:34 AM, Dawid Loubser wrote:
> Glad you're enjoying your 50/1.4 so much! Digital B&W, especially with
> coloured filters (e.g. red), is really rather poor in terms of resolution /
> noise compared to film, because - as you said - you are effectively blocking
> 2/3rds of the image sensor, whereas with most B&W films, even pure red light
> will excite all the silver grains.
>
This makes no sense to me. Any light that is filters out won't excite
any silver grains. Otherwise, the filter would have no effect on the
image at all. You are correct that a filter doesn't increase "noise" on
B&W film, but I don't think your reason is right. It's simply the grain.
The thing I don't get here is why one would want to use color filters on
a digital camera. As you both say, it increases noise. Several releases
ago, PS added a Photo Filter setting, in which you can choose the filter
series and the intensity.
More recently, they added a B&W conversion tool that has interactive
sliders for all the colors. The version in ACR doesn't have presets, but
the one in PS proper does.
I don't know technically how they work, but they seem to me to work well
and without increasing noise. Also, of course, one may make only one
color image and create multiple filter effects later.
Here are some samples, none of which make any difference in noise that I
can see at full pixel.
<http://www.moosemystic.net/Gallery/tech/Process/BW/B&Wconv2.htm>
Moose
> I always got comparatively poor results when using red filter (optical, or in
> post-processing) on my Canon 1D MkIIN files, I can imagine it must be orders
> of magnitude worse on a 4/3rds body.
>
> Still, your images look nice at on-screen resolution!
>
> D.
>
>
> On 25 May 2010, at 6:46 AM, Ken Norton wrote:
>
>
>> I got some criticism that I fixating on the bokeh and DoF
>> characteristics of the 50mm F1.4 lens. On Saturday, after exhausting
>> the honeydo list, I went down to the Spaulding factory to test out the
>> B&W capabilities of the L1 with and without filters.
>>
>> www.zone-10.com
>>
>> I won't be packing away the Ilford just yet, but it isn't too bad.
>>
>> AG
>> --
>> _________________________________________________________________
>> Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
>> Archives: http://lists.thomasclausen.net/mailman/private/olympus/
>> Themed Olympus Photo Exhibition: http://www.tope.nl/
>>
>>
>
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|