Usual caveats apply - wont be the first time I've munged it up.
MARK!
Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller
----- Original Message -----
From: "John Sessoms" <[email protected]>
Subject: Re: PESO - Inot the Mist
From: Ann Sanfedele
John Sessoms wrote:
> From: Ann Sanfedele
>
>> Gotta point this out to Larry... There is an odd phenom happening
>> here - on the right side there is a kind of streakiness in the steam
>> Something I had earlier seen in one of Larry's pics and couldt
>> describe well ... it has little to do with your photo as a photo -
>> which I like, but it is something that happens with digital captures
>> and processing that wouldn't have happened with film... another
>> thing
>> is, when this happens, what does one do to get rid of it? Am I the
>> only one seeing the pinkish waves?
>>
>> ann frank theriault wrote:
>>
>> frank theriault wrote:
>>
>>>> Not so sure about this one. Any thoughts?
>>>>
>>>> http://knarfinthecity.blogspot.com/2011/01/into-mist.html
>>>>
>>>> thanks, frank
>>>
>
> I see what looks like sunlight and shadow streaks through the steam
> over in front of the cyclist.
>
> There appear to be some streaks of wind-blown mist around the woman
> and what may be the shadow of something outside of the frame above and
> behind her.
>
> I also see what look like fairly heavy jpeg compression artifacts
> around the front of the bicycle frame, the front wheel and where the
> cyclist's arms extend down towards where he's holding the handlebars.
>
> Or perhaps it's some kind of moire pattern from the capture.
>
I think "moire" is the word for what I'm seeing... it is only in the
steam ... pink scallopy edges in several concentric waves kinda...
I wonder if it is only something that shows up on a monitor and
disappears if you print. But I do like the photo!
ann
"scallopy edges in several concentric waves" sounds like the kind of
banding I often see in a digital image of the sky around a blown
highlight.
Here's an extreme example of what I mean:
http://static.photo.net/attachments/bboard/00V/00VlQe-220307684.jpg
Deliberately extreme I think to illustrate the effect.
I'm sure there's a good scientific explanation for why it occurs, but I
think it's because digital is only capable of discrete levels. There are
not enough discrete levels in 8 bits to display extreme contrast; there's
no in-between like there is with analog.
When the patterning is that extreme it will show up in prints.
But prints are to some extent analog because ink drops or dyes tend to
spread a little bit and you do get some in-between levels. And if the
banding is not severe the spread of ink/dye may mask it.
So, I guess what I'm trying to say is I think the moire will show up
*more* on a monitor than it will on a print.
Usual caveats apply - wont be the first time I've munged it up.
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