I would push to specification limits (not necessarily failure) if I were
the software test manager at Adobe. Since I'm not that I'm only
concerned if the software behaves appropriately for the images and
conditions that I feed it. This certainly looks like an ACR bug and may
or may not be constrained to the 5DMkII. I've never seen anything like
it before but I don't own a MkII and I've never tried nor do I intend to
try to push 4 stops.
I'm generally very impressed with the code/design quality of PhotoShop
and ACR. In the 5 years I've been using these products I can only
recall one bug that's bad enough to remember. ACR 3 has a memory leak
that causes failure after converting a large number of images (maybe 70
or 80). It fails with an out of memory error trying to write a
converted image and continues to fail the same way until you get to the
end of a batch. I try to remember to restart PS periodically if I'm
processing a bunch of images. If it does fail you will lose your
sidecar editing files... which is what makes this bug memorable. :-)
Chuck Norcutt
Ken Norton wrote:
>> Sounds like a bug in ACR.
>
>
>
> You are just waiting for me to jump right up on my anti-Adobe soapbox here,
> aren't you?
>
> Well, guess what. I'm not. But I am about to launch on us photographers who
> blindly trust that it's ________ therefore it's wonderful. Fill in the blank
> with whatever you want.
>
> Unless a person does their own testing and analysis and pushing the limits
> of things, you're subject to whatever whims of design flaws that might come
> your way.
>
> When I was taking flying lessons, I fired one of my instructors because he
> taught only the straight and level and not how to recover from the the
> problem attitudes. He refused to take the airplane to a stall, but when
> things started feeling rough (5 kts above stall) he'd shove the throttle
> back in, level the plane and say "close enough". When he said that he
> didn't believe in short-field operations and that the 10,000 foot runways
> were good enough for training on, I had enough of him. The fact was, by that
> point I already knew how to shortfield/softfield land a Cessna 172 and bring
> it to a complete stop in well under 300 feet, so I knew the guy was
> worthless. I asked him about slips and he said that he didn't teach them. I
> asked him how I was going to pass the checkride, and he said something to
> the effect that he sends all his students to this one check pilot who
> doesn't push the issue. PS, on one approach to a 10000' runway I was way
> high on final, but knew how to slip it in and squeek it on the threshold,
> but he forced me to go around. Yeah, I know, he was the instructor, but good
> grief... We could have landed it 10 times in the length of the runway! BTW,
> the instructor that taught me the shortfield work was a former missionary
> bush pilot. During one training flight we landed a Cessna 172 crosswise on a
> wide runway. I got my early flight training on another treelined airport,
> though, that had a 25' wide runway. In fact, the entire clearing of one of
> the runways was not even 150' wide. Landing on that runway required that you
> almost stall the airplane as your wheels brush the branches of the 100'
> trees at the end of the runway. This was the airport my dad flew out of all
> the time and it was as challenging as anything anywhere. The crosswinds were
> ALWAYS horrid and swirling and only one runway departure, of the four,
> didn't have at least an 85' tree at the end. Did I mention the ever present
> deer on the runways or the fact that at no point in the pattern could you
> see the entire runway? (That airport is now closed and the runways are
> almost totally reclaimed by nature--good riddence)
>
> My point is, that you need to test to failure. Test to see just how far you
> can push an image. Learn and apply. As to the pushing of an image two or
> more stops, that isn't unusual because we do a ton of highlight and shadow
> recovery in our images which can far exceed two stops of manipulation.
>
> I personally continue to test my equipment, even though I think I know
> everything there is to know about it because every time I do, I end up
> learning something new.
>
> AG
--
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