Hi,
On Wed, 2008-03-19 at 14:16 +1100, David Hodson wrote:
Should be easy(-ish) :
Split image into red, green, blue channels.
Apply lens correction to red and blue channels to align with green.
Recombine channels.
That would work well if the light was combined out of exactly three
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
* 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
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 read,
- 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
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 controlled
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 project'
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 that product
- 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
size,
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 couple of really
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 often
-
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 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 couple of really
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.
--
* 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 be made such
Simon Roberts wrote:
snip
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 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 work.
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 work.
All suggestions
On Mon, Mar 17, 2008 at 1:39 PM, norman [EMAIL PROTECTED] 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
On Mon, Mar 17, 2008 at 03:09:47PM -0500, Chris Mohler wrote:
On Mon, Mar 17, 2008 at 1:39 PM, norman [EMAIL PROTECTED] 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.
Given a sample image I can be more specific than the following:
1 Decompose the image into LAB channels.
2 Despeckle the AB channels (oilify with low exponent is also an option)
3 Recompose
On Tue, Mar 18, 2008 at 6:44 AM, Jeffrey Brent McBeth [EMAIL PROTECTED] wrote:
On Mon, Mar 17, 2008 at
I think there used to be a plugin in the registry for doing this, but I can't
remember
the name of it. Dunno if it would work in 2.4 or not.
--- norman [EMAIL PROTECTED] wrote:
I have been copying some old colour transparencies using my digital
camera and most of the images produced suffer
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