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Lens profiling tool from Adobe ( for CS5 / LR / ACR ).



 
 
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  #131  
Old May 14th 10, 09:58 AM posted to rec.photo.digital.slr-systems,rec.photo.equipment.35mm
Chris H
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Posts: 2,283
Default Lens profiling tool from Adobe ( for CS5 / LR / ACR ).

In message , Floyd L. Davidson
writes

You're wasting time on ad hominem that could be better spent making more of an
effort to understand what I'm trying to explain.


The argument is naive. It is illogical and reaches an
invalid conclusion because it ignores well known facts
and incorporates non-sequitur premises. That is not ad
hominem.

You need to do a better job of understanding what we are
discussing, and cease "explaining" what you don't
understand.


Floyd, you are in danger of making an arse of yourself again. You know a
LOT less than you think you know in some many fields where you (alone)
think you are an expert.

I recall last time you ended up telling some one who had documentary
evidence that a NATO meeting they were are did not take place. They you
told them that they had no idea what they were talking about despite the
fact they are well known (and well documented) for having done it.


To everyone else.... don't bother arguing with floyd. He is not
connected to reality. Probably due to living in Alaska he does not get
out much and have contact with real people.

--
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
\/\/\/\/\ Chris Hills Staffs England /\/\/\/\/
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/



  #132  
Old May 14th 10, 10:51 AM posted to rec.photo.digital.slr-systems,rec.photo.equipment.35mm
David J Taylor[_16_]
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Posts: 1,116
Default Lens profiling tool from Adobe ( for CS5 / LR / ACR ).

"Mxsmanic" wrote in message
...
[]
Nothing can record the full spectrum, so many effects that require the
full
spectrum as a starting point must be carried out at the time the photo
is
recorded, not after it has been converted to RGB (or any other
representation).


... although I know of one sensor which records some 8000+ spectral values
per pixel.

Cheers,
David

  #133  
Old May 14th 10, 10:54 AM posted to rec.photo.digital.slr-systems,rec.photo.equipment.35mm
Chris H
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Posts: 2,283
Default Lens profiling tool from Adobe ( for CS5 / LR / ACR ).

In message
..com, Annika1980 writes
On May 10, 7:05*pm, Alan Browne
wrote:
http://labs.adobe.com/technologies/l...r/?PID=3154956

Presumably one can make a profile of their lenses that Adobe doesn't
provide directly. *Profile data collected allow correction for geometric
distortion, lateral chromatic aberration and vignetting.

Alternately, wait a while for other enthusiasts to make the profiles,
then use those.

The number of test images can get large when a zoom is profiled. *(At
one site someone estimated it as:

1) Shoot (6 focal length positions) × (3 focus distance positions) × (4
aperture positions) = 72 image sets

2) They also recommend 9 images per set so that's 648 photos to create a
profile for one lens! Ouch!!

I didn't go looking to validate the above, but it certainly looks like a
labour of love...

--


Bye-Bye Dxo Optics.


I thought that but then I thought...

1) Shoot (6 focal length positions) × (3 focus distance positions) × (4
aperture positions) = 72 image sets
2) They also recommend 9 images per set so that's 648 photos to create a
profile for one lens! Ouch!!


That is a LOT of effort. Also I suspect none of us will be able to do it
to the same level of accuracy as dXo Optics. I would be suspect of any
profiles sent in by users.

Definitely Ouch!!


As for the comment re using the computers to design the lenses.... they
do hence I can get an 18-200 zoom with "acceptable" distortion that
would have not been possible 10 years ago.

Obviously the answer is not to buy an 18-200 zoom for 500GBP but to buy
6 pro lenses between 1000 - 3000 GBP each to cover the range.....

Until I win the lottery and can afford 20,000 GBP on lenses I will have
to make do with the 18-200 and dXo for under 1000 GBP.

I do get better glass when I can justify it but in the mean time the
super-zoom fills in the gaps.


--
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
\/\/\/\/\ Chris Hills Staffs England /\/\/\/\/
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/



  #134  
Old May 14th 10, 12:12 PM posted to rec.photo.equipment.35mm
Walter Banks
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Posts: 803
Default Lens profiling tool from Adobe ( for CS5 / LR / ACR ).



Mxsmanic wrote:

Walter Banks writes:

The serious astronomy guys that show up at star parties use a lot of
software to extract image information has been distorted by atmosphere
and optics.


Only because they have no other option. And they are lucky in a sense because
they are often dealing with point sources.


The side effect was that every serious amateur astronomer now
has software tools to significantly improve the images they shoot
through an 8 inch backyard scope.





  #135  
Old May 14th 10, 12:22 PM posted to rec.photo.equipment.35mm
Walter Banks
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Posts: 803
Default Lens profiling tool from Adobe ( for CS5 / LR / ACR ).



Bill Graham wrote:

"Walter Banks" wrote in message
...


"Floyd L. Davidson" wrote:

At some point in the future the intentional lens design
compromises will expand to include not just optical
correction, but software corrections.


How about a lens profile built into the lens. Each lens
is profiled as it is manufactured and the tables stored
in the lens accessible from the camera.

w..


The encoding could be built in to the back of the lens mount, and accessible
to whatever camera it was attached to. Or it could be available to the
camera via a USB port on the rear of the lens mount. After all, a digital
camera is really just a computer anyway, isn't it?


To some extent this is already happening with
fixed lens point and shoot. In the PS case they are still
correcting for the production lens mean.

USB requires only two data pins. This approach
could make a big difference in digital imaging with
calibration data for each lens.

Machine readable data tables shipped with lenses now
would make a difference. High end lens packed with a
with a thumbdrive or SD card containing calibration
information for post processing software.

w..







  #136  
Old May 14th 10, 06:57 PM posted to rec.photo.digital.slr-systems,rec.photo.equipment.35mm
nospam
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Posts: 24,165
Default Lens profiling tool from Adobe ( for CS5 / LR / ACR ).

In article , Mxsmanic
wrote:

or maybe they know how to do it.


They cannot do the impossible. But often they don't understand that there are
things that they cannot do.


just because you think it's impossible doesn't mean it actually is. the
reality is that it's very possible.

It's a problem with art directors, too, who often think that anything can be
fixed in Photoshop.


not everything, but many things can and that number is increasing.

real world examples prove otherwise.


Point me to them.


flickr, pbase, smugmug, zenfolio and other online galleries.
  #137  
Old May 14th 10, 06:59 PM posted to rec.photo.digital.slr-systems,rec.photo.equipment.35mm
nospam
external usenet poster
 
Posts: 24,165
Default Lens profiling tool from Adobe ( for CS5 / LR / ACR ).

In article , Bruce
wrote:

As for using Photoshop to eliminate converging verticals, as Mxmanic
has explained (correctly, but too many times!) there is a huge loss of
image quality. I am very well acquainted with the picture editor of
an architectural magazine He summarily rejects any shot submitted for
publication where converging verticals have been corrected in
software. He says he can spot them a mile away, and I believe him. I
have tried very hard to hoodwink him but without success ...


it's not a huge loss of quality when done correctly and i guarantee
that your editor can't reliably spot them if they're done properly.
don't discard the concept because some people can't do a good job.
  #138  
Old May 14th 10, 07:20 PM posted to rec.photo.digital.slr-systems,rec.photo.equipment.35mm
Alan Browne
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Posts: 12,640
Default Lens profiling tool from Adobe ( for CS5 / LR / ACR ).

On 10-05-13 22:28 , Savageduck wrote:
On 2010-05-13 18:52:26 -0700, "Peter" said:


You were far more polite than I in saying the same thing. :-)


Given that he hijacked Alan's OP, which was only an inquiry regarding


De nada. Challenge is good.

Sony/Minolta lens profiles in CS5, and added the not raised issue of


Not even. Just stating that Adobe has the capability as well as the
tools to use the profs. On other Sony dedicated groups there is some
degree of emerging organization to profile the lenses and share them. So
in time they should all be well covered.

fixing "blurry images" resulting from the use of, in his opinion "cheap"
lenses.
I can think of several very expensive lenses which have benefitted from
the CS lens correction filter, or SW such as DxO.
I believe most of the DSLR users here own a variety of lenses which
could hardly be described as "cheap". In the case of some, they own, and
use some of the best, and most expensive lenses in their class.

He is in some ways worse than a troll, he is an opportunistic hijacker
with no purpose.


Mxmanic used to be a regular around here (esp. in rpe35mm) and he was
either sharply logical or deliberately obtuse.

--
gmail originated posts are filtered due to spam.
  #139  
Old May 14th 10, 07:21 PM posted to rec.photo.digital.slr-systems,rec.photo.equipment.35mm
Alan Browne
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Posts: 12,640
Default Lens profiling tool from Adobe ( for CS5 / LR / ACR ).

On 10-05-14 2:27 , Annika1980 wrote:

Many people are now using tilt-shift lenses to create time-lapse
videos like these:
http://www.vimeo.com/7970599


Now _that's_ table top!

--
gmail originated posts are filtered due to spam.
  #140  
Old May 14th 10, 07:24 PM posted to rec.photo.digital.slr-systems,rec.photo.equipment.35mm
Peter[_7_]
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Posts: 2,078
Default Lens profiling tool from Adobe ( for CS5 / LR / ACR ).

"nospam" wrote in message
...
In article , Bruce
wrote:

As for using Photoshop to eliminate converging verticals, as Mxmanic
has explained (correctly, but too many times!) there is a huge loss of
image quality. I am very well acquainted with the picture editor of
an architectural magazine He summarily rejects any shot submitted for
publication where converging verticals have been corrected in
software. He says he can spot them a mile away, and I believe him. I
have tried very hard to hoodwink him but without success ...


it's not a huge loss of quality when done correctly and i guarantee
that your editor can't reliably spot them if they're done properly.
don't discard the concept because some people can't do a good job.



There are techniques for spotting changes in PS. But, when done correctly,
the only way to spot them is to get down to the pixel level. At magazine
printing resolution I would think any lost data would be almost
imperceptible.

--
Peter

 




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