I was just thinking about the overexposure bit. Maybe there is more
to exposure than I thought. While it is true that it is not truly
overexposed to the point of the red channel being slammed up against
the right boundary of the histogram it is the only channel with any
information to the right of the center line. Both the blue and the
green channel stop near the center line. So the rose is just shades
of red - little blue or green except for the deepest shadows. If you
do anything to increase the red value it lightens the darker red that
is the detail but is still to the right of the midline and it goes
all flat. It has the effect of overexposure. If you look at the
overall histogram of the corrected image I sent Brian and move the
right hand arrow to the left you can watch the detail disappear in
the rose.
Winsor
Long Beach, California, USA
On Nov 18, 2006, at 6:16 PM, Chuck Norcutt wrote:
> Are we looking at the same photos? I show the red channel on the
> single
> rose image to be slightly underexposed and the red channel on the
> multiple rose image to be almost a stop underexposed. Nothing blown
> anywhere. I even looked at the historgrams under two separate apps
> just
> to be sure. Nada.
>
> Chuck Norcutt
>
> Winsor Crosby wrote:
>
>> There is nothing wrong with your lens Brian, nor is it unsharp,
>> although it is not cheating to sharpen a digital image. What is wrong
>> is that the red channel is supersaturated/overexposed and has burned
>> out your detail. It is a common problem that sensors are over
>> sensitive to red. Taking pictures of red objects usually calls for
>> cutting back exposure to save the red and boosting exposure in the
>> dark areas later. If you do some judicious cut back of the red
>> channel in and some boost in green and blue the picture is saved. I
>> will attach a corrected jpeg to your copy of the message. If you open
>> it in your image processor you should be able to see the moisture on
>> the rose petals. It is a beautiful image. I really should mess with
>> a website.
>>
>>
>>
>> Winsor
>> Long Beach, California, USA
>>
>>
>>
>>
>> On Nov 18, 2006, at 2:06 PM, Brian Swale wrote:
>>
>>
>>> Hi all you Olympus users
>>>
>>> I have come to the conclusion that a good part of my
>>> dissatisfaction with the
>>> E-1 stems from the fact that the only DZ lens I have is the 14 -
>>> 45mm kit
>>> lens that came with the camera. It just does not deliver sharp
>>> images.
>>>
>>> Look at these two photographs of Ingrid Bergman; (rotated left one)
>>> resized
>>> to 1000 pixels wide (was height) with irfan view, saved at 85%.
>>>
>>> http://homepages.caverock.net.nz/~bj/photography/zuikoholics/
>>> recent5.htm
>>>
>>> I should get the 50mm macro and the 14-54. Sometime. When they are
>>> more affordable !!
>>>
>>> The story behind these two shots is like something from a Greek
>>> tragedy.
>>>
>>> I have an old friend - old in both senses of the word, now - who
>>> was in class
>>> with me at secondary school. An extremely talented guy. Or was.
>>>
>>> His wife is dying of cancer and has just a few weeks to live. He
>>> doesn't know
>>> exactly where she is (in a hospice somewhere in the same city), and
>>> he is
>>> now forbidden by law ( he has had a trespass order placed on him)
>>> to make
>>> any contact with her. Not that he was violent as far as I know -
>>> "just" a case
>>> of being severely alcoholic to the point that she couldn't stand it
>>> any more.
>>>
>>> I intend to send her a card, and he asked if I could send her a
>>> bunch of red
>>> roses, via me. I indicated they'd have a snow-ball's chance in hell
>>> of getting
>>> past the gate-keeper, but I would take some pics of red roses and
>>> include a
>>> couple of prints with the card, and hope they would get through.
>>> He never
>>> had the chance to say goodbye before the ambulance took her
>>> away. :-(
>>>
>>> There's more to the story than that, but that is the story behind
>>> the roses.
>>> Actually, I took more shots and these came from the second visit; I
>>> was so
>>> disappointed with the first set of shots.
>>>
>>> I can get sharper shots with the OM4Ti and any one of several Zuiko
>>> lenses,
>>> and Fuji Reala.
>>>
>>> Brian
>>>
>>> ==============================================
>>> List usage info: http://www.zuikoholic.com
>>> List nannies: olympusadmin@xxxxxxxxxx
>>> ==============================================
>>
>>
>>
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>>
>
>
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