CA correction who wants to participate in a comparison of software

**Lowell Goudge** · 06-03-2011, 06:17 PM

Ok I want to see the best way to make a silk purse out of a sow's ear.

I have an image that I will upload shortly, and make available by e-mail in DNG format to those willing to participate in the comparison. The photo was shot with my K10d and a sigma Mini-wide 28mm Macro which has a reputation of serious CA. The photo is a good example.

I have done CA removal using the pentax photo software (V4) which came with my K7 and also with my usual editor PSP X3

I will also post those results as they are quite suprising and quite different due to the different way the two programs work.

The idea would be to collect a comprehensive collection of reviews on different programs and the CA removal under the one thread using the one image for all programs, makin a standard reference. Only CA removal and contrast/ hue/ saturation will be requested, not sharpening or noise reduction

Who's in?

Photos to follow

Marc Sabatella · 06-03-2011, 09:15 PM

I'm not particularly skilled at using the CA controls in ACDSee, but if no one else takes that up, I've give it a shot.

**Ash** · 06-03-2011, 09:52 PM

I can also have a crack at it using ACR/PS CS3. I would have to have access to the file through a permitted hosting site (currently subjected to a firewalled network).

wildman · 06-04-2011, 12:47 AM

Count me in.

**Lowell Goudge** · 06-04-2011, 05:02 AM

Originally posted by Ash

I can also have a crack at it using ACR/PS CS3. I would have to have access to the file through a permitted hosting site (currently subjected to a firewalled network).

Ash. I can look to set up an FTP site or look at somehow putting the file on the forum somewhere but even zipped the DNG file is 13 MB

**Lowell Goudge** · 06-04-2011, 05:03 AM

Originally posted by wildman

Count me in.

What software?

**Ash** · 06-04-2011, 07:48 AM

Originally posted by Lowell Goudge

I can look to set up an FTP site or look at somehow putting the file on the forum somewhere but even zipped the DNG file is 13 MB

Size is not an issue for me, it's more the permitted/prohibited list of sites that I would have access to over the next week or so. Just go ahead and upload it into your intended host and I'll see how I go with it.

**Lowell Goudge** · 06-04-2011, 08:22 AM

Ok, so here are the first comparisons.

CA correction with Corel PSP X3 and Pentax Photo Utility 4, and the uncorrected image.

Corel takes color corrections where you select in a window, the range of CA you want corrected, and then also the pixel radius you want to correct over. If you don't have enough range in the selection it skips some corrections, making you go back and do it again with different selectionss, same for the radius. it does not correct if the radius you select is too small. as a result, you can some times have spotty correction

by using this technique, the image resolution is quite poor as well as can be seen in the shots post processing.

Pentax on the other hand seems to provide some form of correction and actual layer by color resizing, as you move out from the middle, which really addresses CA as it is produced by the lens, and as a result, the corrected image gains considerably in sharpness.

Here is the total scene, in reduced resolution, and clips out of 2 spots uncorrected, corrected usingt pentax and corrected using corel

draw your own conclusions.

Edit note, I am still looking at best way to uplink the DNG file, so at present the only way to get it is via E-Mail

Whole Scene

Uncorrected sections

Pentax Corrected

Corel Corrected

**Lowell Goudge** · 06-04-2011, 10:10 AM

For all those interested send a PM and I will send you the file

wildman · 06-04-2011, 03:11 PM

Originally posted by Lowell Goudge

What software?

acdSEE pro 4
Photoimpact
Power Retouche (plug in)

I have others that can correct CA and fringing but I never use them for that purpose.

**Ash** · 06-04-2011, 03:36 PM

Looks like the Pentax software does a great job.
PM sent.

**Lowell Goudge** · 06-04-2011, 03:42 PM

Originally posted by Ash

Looks like the Pentax software does a great job.
PM sent.

Like I said in the initial post
What does the best job making a silk purse out of a sow's ear

Just a quick note, it seems that the pentax digital camera utility can't do editing on JPEGs, at least the one I re-named

Class A · 06-04-2011, 05:26 PM

If you find a way to upload the DNG to a place where I can download it from, I'd be happy to process it with Lightroom 3.

**Lowell Goudge** · 06-04-2011, 06:35 PM

Originally posted by Class A

If you find a way to upload the DNG to a place where I can download it from, I'd be happy to process it with Lightroom 3.

Working on it

Can lightroommprocess jpg?

**Ash** · 06-04-2011, 08:21 PM

Sorry Lowell.
Cannot get permission to transfer file to personal computer where PS is at the moment.
Will be ashore in a week and will be able to do it then.
In the meantime, perhaps someone else with PS can chime in...

06-03-2011, 06:17 PM	#1
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,886	CA correction who wants to participate in a comparison of software Ok I want to see the best way to make a silk purse out of a sow's ear. I have an image that I will upload shortly, and make available by e-mail in DNG format to those willing to participate in the comparison. The photo was shot with my K10d and a sigma Mini-wide 28mm Macro which has a reputation of serious CA. The photo is a good example. I have done CA removal using the pentax photo software (V4) which came with my K7 and also with my usual editor PSP X3 I will also post those results as they are quite suprising and quite different due to the different way the two programs work. The idea would be to collect a comprehensive collection of reviews on different programs and the CA removal under the one thread using the one image for all programs, makin a standard reference. Only CA removal and contrast/ hue/ saturation will be requested, not sharpening or noise reduction Who's in? Photos to follow

06-04-2011, 08:22 AM	#8
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,886 Original Poster	Pentax Photo Utility 4 vs Corel PSP X3 Ok, so here are the first comparisons. CA correction with Corel PSP X3 and Pentax Photo Utility 4, and the uncorrected image. Corel takes color corrections where you select in a window, the range of CA you want corrected, and then also the pixel radius you want to correct over. If you don't have enough range in the selection it skips some corrections, making you go back and do it again with different selectionss, same for the radius. it does not correct if the radius you select is too small. as a result, you can some times have spotty correction by using this technique, the image resolution is quite poor as well as can be seen in the shots post processing. Pentax on the other hand seems to provide some form of correction and actual layer by color resizing, as you move out from the middle, which really addresses CA as it is produced by the lens, and as a result, the corrected image gains considerably in sharpness. Here is the total scene, in reduced resolution, and clips out of 2 spots uncorrected, corrected usingt pentax and corrected using corel draw your own conclusions. Edit note, I am still looking at best way to uplink the DNG file, so at present the only way to get it is via E-Mail Whole Scene Uncorrected sections Pentax Corrected Corel Corrected

06-04-2011, 03:42 PM	#12
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,886 Original Poster	Originally posted by Ash Looks like the Pentax software does a great job. PM sent. Like I said in the initial post What does the best job making a silk purse out of a sow's ear Just a quick note, it seems that the pentax digital camera utility can't do editing on JPEGs, at least the one I re-named Last edited by Lowell Goudge; 06-04-2011 at 04:12 PM.

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06-03-2011, 09:15 PM	#2
Marc Sabatella Veteran Member Join Date: Sep 2006 Location: Denver, CO Photos: Gallery Posts: 10,685	I'm not particularly skilled at using the CA controls in ACDSee, but if no one else takes that up, I've give it a shot.

06-03-2011, 09:52 PM	#3
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	I can also have a crack at it using ACR/PS CS3. I would have to have access to the file through a permitted hosting site (currently subjected to a firewalled network).

06-04-2011, 12:47 AM	#4
wildman Veteran Member Join Date: Jun 2008 Location: Flyover America Posts: 4,469	Count me in.

06-04-2011, 05:02 AM	#5
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,886 Original Poster	Originally posted by Ash I can also have a crack at it using ACR/PS CS3. I would have to have access to the file through a permitted hosting site (currently subjected to a firewalled network). Ash. I can look to set up an FTP site or look at somehow putting the file on the forum somewhere but even zipped the DNG file is 13 MB

06-04-2011, 05:03 AM	#6
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,886 Original Poster	Originally posted by wildman Count me in. What software?

06-04-2011, 07:48 AM	#7
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	Originally posted by Lowell Goudge I can look to set up an FTP site or look at somehow putting the file on the forum somewhere but even zipped the DNG file is 13 MB Size is not an issue for me, it's more the permitted/prohibited list of sites that I would have access to over the next week or so. Just go ahead and upload it into your intended host and I'll see how I go with it.

06-04-2011, 10:10 AM	#9
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,886 Original Poster	For all those interested send a PM and I will send you the file

06-04-2011, 03:11 PM	#10
wildman Veteran Member Join Date: Jun 2008 Location: Flyover America Posts: 4,469	Originally posted by Lowell Goudge What software? acdSEE pro 4 Photoimpact Power Retouche (plug in) I have others that can correct CA and fringing but I never use them for that purpose.

06-04-2011, 03:36 PM	#11
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	Looks like the Pentax software does a great job. PM sent.

06-04-2011, 05:26 PM	#13
Class A Pentaxian Join Date: Aug 2008 Location: Wellington, New Zealand Posts: 11,251	If you find a way to upload the DNG to a place where I can download it from, I'd be happy to process it with Lightroom 3.

06-04-2011, 06:35 PM	#14
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,886 Original Poster	Originally posted by Class A If you find a way to upload the DNG to a place where I can download it from, I'd be happy to process it with Lightroom 3. Working on it Can lightroommprocess jpg?

06-04-2011, 08:21 PM	#15
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	Sorry Lowell. Cannot get permission to transfer file to personal computer where PS is at the moment. Will be ashore in a week and will be able to do it then. In the meantime, perhaps someone else with PS can chime in...