norman wrote:
> I have been copying some old colour transparencies using my digital
> camera and most of the images produced suffer from chromatic aberration
> somewhere within them. I have tried to find some procedure to remove
> these blemishes but, so far, have not found anything I can get to wo
I have found that a small low cost program called Ptlens does a very
fair job of reducing CA, and various other lens distortions.. It only
runs on Win2K, XP or Vista or Unix with a windows simulator, either free
standing or as a PS plugin. Profiles are available for many cameras.
Details availa
Simon Roberts wrote:
> See Ken Rockwell's comments on "it's not the camera" at
> http://www.kenrockwell.com/tech/notcamera.htm
>
An excellent discussion, although Rockwell fails to mention Ansel
Adams's darkroom artistry (see wikipedia on Ansel Adams and the
associated reference 18).
__
* norman <[EMAIL PROTECTED]> [03-18-08 10:53]:
> < snip >
> >
> > Unfortunately, ca is controlled in lense manufacture and design and
> > has two solutions, software or better glass. Minimizing ca via
> > technique would severly limit your scope, imo.
>
> I would expect most lenses these days to
On Tue 18-Mar-2008 at 16:23 +, norman wrote:
>
>> http://wiki.panotools.org/SoC_2008_ideas#tCA_Correction
>
>This seems to assume that the optics are the cause of the CA whereas I
>understand that CA is also caused by the chip in e digital camera. Will
>this process take care of that?
Nope.
-
-
< snip >
> Are you "copying" the slides, or are you scanning them?
>
> If you're using a slide copying attachment and effectively rephotographing
> them onto your digital camera, then the CA of the copying equipment will be a
On Tue, 2008-03-18 at 15:33 +, norman wrote:
> I feel sure that you must be correct. I have never seen any noticeable
> fringing or CA effects with my ordinary photography it is only with
this
> project I set myself of copying a lot of old colour transparencies. In
> the old days I used to of
On Tue, 2008-03-18 at 16:23 +, norman wrote:
> On Tue, 2008-03-18 at 15:46 +, Bruno Postle wrote:
> > On Tue 18-Mar-2008 at 08:13 -0700, Simon Roberts wrote:
> > >
> > >Software can certainly help with this, and "that other product" has
> > >this built in. Then again, you can buy a coupl
On Tue, 2008-03-18 at 16:23 +, norman wrote:
> On Tue, 2008-03-18 at 15:46 +, Bruno Postle wrote:
> > On Tue 18-Mar-2008 at 08:13 -0700, Simon Roberts wrote:
> > >
> > >Software can certainly help with this, and "that other product" has
> > >this built in. Then again, you can buy a coupl
- Original Message
From: norman <[EMAIL PROTECTED]>
...
> CA is indeed a function of the lens quality. You're also right that a smaller
> sensor makes CA more visible, that's just simple geometry. If the lens
> produces an abberation of any given size, then if the sensor is half the
>
On Tue, 2008-03-18 at 15:46 +, Bruno Postle wrote:
> On Tue 18-Mar-2008 at 08:13 -0700, Simon Roberts wrote:
> >
> >Software can certainly help with this, and "that other product" has
> >this built in. Then again, you can buy a couple of really nice
> >lenses for the price you'll pay for tha
On Tue 18-Mar-2008 at 08:13 -0700, Simon Roberts wrote:
>
>Software can certainly help with this, and "that other product" has
>this built in. Then again, you can buy a couple of really nice
>lenses for the price you'll pay for that product ;>
Not an immediate solution, but 'over at the hugin pr
On Tue, 2008-03-18 at 08:13 -0700, Simon Roberts wrote:
>
> - Original Message
> From: norman <[EMAIL PROTECTED]>
> To: gimp-user@lists.XCF.Berkeley.EDU
> Sent: Tuesday, March 18, 2008 8:52:22 AM
> Subject: Re: [Gimp-user] chromatic aberration
>
> < snip >
> >
> > Unfortunately, ca is
- Original Message
From: norman <[EMAIL PROTECTED]>
To: gimp-user@lists.XCF.Berkeley.EDU
Sent: Tuesday, March 18, 2008 8:52:22 AM
Subject: Re: [Gimp-user] chromatic aberration
< snip >
>
> Unfortunately, ca is controlled in lense manufacture and design and
> has two solutions, software
< snip >
>
> Unfortunately, ca is controlled in lense manufacture and design and
> has two solutions, software or better glass. Minimizing ca via
> technique would severly limit your scope, imo.
I would expect most lenses these days to be made such that they do not
cause CA. From what I have rea
* norman <[EMAIL PROTECTED]> [03-18-08 09:46]:
> Therefore, I believe what I should do is concentrate on photographic
> techniques with a view to minimising the chromatic aberration as much
> as possible. Any advice in this direction would be very welcome.
Unfortunately, ca is controlled in lense
Thank you very much for trying to help me sort out the problem. It looks
very much as though any procedure would be both complex and time
consuming without any guarantee of success. Therefore, I believe what I
should do is concentrate on photographic techniques with a view to
minimising the chromat
Hi,
On Mon, 2008-03-17 at 07:36 -0400, Geoffrey wrote:
> I'm curious as to which would be the preferred print functionality?
> I've noticed both options but can't really tell much difference in the
> quality of the output.
The GTK+ print system doesn't deal with driving the printers, it is only
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