I need some help on this one as I don't understand what you were trying
to illustrate with the use of a red filter on a positive image. If you
were using a red filter on B&W negative film one would expect the blue
sky to be darkened. But, since you're working on a positive image that
doesn't happen. All that happens is that most of the blue and green are
filtered out. If you then attempt to convert this image to B&W you get
little more than the tonality that was in the red channel. Using the
color channel sliders is ineffective since there's very little blue and
green left in the image and that's only in the shadow areas. Perhaps
that's what you intended but, if so, to what purpose?
Chuck Norcutt
On 6/15/2014 11:31 PM, Ken Norton wrote:
Just leave the color filters at home. There's nothing they can do that
can't be done (and done better) in post processing.
For the most part, I certainly agree with this statement. There is one
slight variation to it, but that's very slight.
No commentary provided, but I did post a directory of test images. The
first image is the in-camera jpeg, the second is the converted raw
file with monochrome and auto contrast. The third image is the
converted raw file with no adjustments.
http://zone-10.com/tope2/main.php?g2_itemId=13348
P1030172 - No lens filter
In Camera B&W
Raw Converted to monochrome with red filter applied and auto contrast
Raw Converted with no adjustments
P103073 - Red #25 lens filter, no exposure compensation
In Camera B&W
Raw Converted to monochrome and auto contrast
Raw Converted with no adjustments
P103074 - Red #25 lens filter, +1 exposure compensation
In Camera B&W
Raw Converted to monochrome and auto contrast
Raw Converted with no adjustments
P103075 - Red #25 lens filter, +2 exposure compensation
In Camera B&W
Raw Converted to monochrome and auto contrast
Raw Converted with no adjustments
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