I would test the theory that the red channel is any different from the
others by shooting a monochrome resolution test chart and then a
series of targets with red green and blue edges. Examine the results
and evaluate whether there is any truth to this alleged red channel
deficiency first.
Another friend is working with the D200 quite a lot ... He does
graphically inspired abstracts with lots of highly colored
subjects ... And I have seen no evidence of unsharpness in his
captured images.
Godfrey - www.gdgphoto.com
On Sep 28, 2008, at 6:08 AM, David J Brooks <[EMAIL PROTECTED]> wrote:
On Sat, Sep 27, 2008 at 10:36 PM, Derby Chang <[EMAIL PROTECTED]>
wrote:
I know you understand what I mean. Dave asked why his red channel
looked
soft. I meant that looking at just one channel after demosaicing
was not
looking at the full resolution of the sensor
It was mentioned to me on my Nikon BB, that the red channel in the
D200 "seems" to be a factor in the preceived softness on the D200
images i get. It was also suggested to go in and sharpen just that
channel, but i see no difference to that channel when i do it, and yes
looks pretty soft.Although in a horse photo, red would be the major
colour, would it not.
I'm just trying to find a work around, instead of trying the D300 or
D700, both of which have much better sharpness ratings, or lets say,
less complqaints.:-)
Dave
I humbly apologise to your Holiness I was not clear.
D
Godfrey DiGiorgi wrote:
Then I don't understand your sentence below. Dave is looking at
individual
channels in RGB which, as you say, will be softer than the full
three
channel composite.
At this point in the process, Bayer demosaicing and gamma
interpolation
happened long ago ...
So what does "The Bayer demosaicing will then be trying to
interpolate
from what information it has" have to do with the fact stated above?
G
On Sep 27, 2008, at 5:45 PM, Derby Chang wrote:
Yes, that's my point. If you are looking at a predominantly green
image,
the detail is in the green. Looking at the red channel means you
are looking
at rather less resolution than the full RGB image
D
Godfrey DiGiorgi wrote:
When you're looking at an RGB channel file in Photoshop, the Bayer
demosaicing is long past.
Godfrey
On Sep 27, 2008, at 4:37 PM, Derby Chang wrote:
Don't forget, Dave, individual channels will be "softer" than
the full
RGB image, especially if you are looking in one channel and the
most of the
colours are in the other two. The Bayer demosaicing will then
be trying to
interpolate from what information it has.
D
David J Brooks wrote:
Good, its not my eyes.:-)
I tried adjusting sharpness on that channel but did not see any
change. I;'m sure i;m doing something wrong, or, the photos
from the
D200 ARE really soft.
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