Mike Chaney's Tech Corner
November 30, 2020, 05:08:04 AM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
News: Feb 2013: Qimage Ultimate Challenges... have fun and explore features!
 
   Home   Help Search Login Register  

Professional Photo Printing for Windows
Print with
Qimage and see what you've been missing!
Pages: [1]
  Print  
Author Topic: v2009.267 issues/comments  (Read 15078 times)
admin
Administrator
Forum Superhero
*****
Posts: 3179



View Profile Email
« on: July 16, 2009, 08:38:20 PM »

http://www.ddisoftware.com/qimage

v2009.267     07/16/09     

Priority: Low     

v2009.267 improves raw support for the Panasonic GH1 by automatically correcting barrel distortion at wide angles when using the 14-140 kit lens.  v2009.267 also corrects a bug that was causing the bottom row of thumbnails to not update properly after a thumbnail rebuild under certain conditions.

Mike
Logged
Terry-M
The Honourable Metric Mann
Forum Superhero
*****
Posts: 3197



View Profile WWW
« Reply #1 on: July 16, 2009, 09:03:03 PM »

Mike,
Quote
automatically correcting barrel distortion at wide angles
That sounds very clever to me  Cool
What about other cameras and lenses, or do you need a database of lens characteristics like PTLens?
I have a Canon 17-85 IS lens that has poor aberration performance at wide angle both with barrel distortion and chromatic aberration. Auto correction of both would be very nice.  Wink
Terry.
Logged
Fred A
Forum Superhero
*****
Posts: 5368



View Profile WWW Email
« Reply #2 on: July 16, 2009, 09:48:58 PM »

Mike,
Please be advised that the message from Terry was only sent so he can get to 100 posts and upgrade his forum membership.
 Roll Eyes Roll Eyes Roll Eyes Roll Eyes Roll Eyes
Fred
Logged
admin
Administrator
Forum Superhero
*****
Posts: 3179



View Profile Email
« Reply #3 on: July 16, 2009, 10:19:36 PM »

Mike,
Quote
automatically correcting barrel distortion at wide angles
That sounds very clever to me  Cool
What about other cameras and lenses, or do you need a database of lens characteristics like PTLens?
I have a Canon 17-85 IS lens that has poor aberration performance at wide angle both with barrel distortion and chromatic aberration. Auto correction of both would be very nice.  Wink
Terry.

Ah you see into future oh great one!  Cheesy  That's the next step.  Now that I've written my own code to correct lens distortions, you'll see it in the batch filter in the future and I may even make plugins for Qimage that will allow automatic correction based on lens models.  This change was to support new technology by Panasonic that was required to properly decode G1 and GH1 raw photos.  Panasonic has done something interesting in their latest lenses/software.  They've made their lenses simpler and the software more complex to compensate.  Instead of making expensive lenses that correct distortion optically, they can make lenses with less elements and make them cheaper.  Then they remove the barrel distortion at wide angle via software, so software removal of lens distortion is a requirement for raw decoding on their new micro four thirds cameras!  Unfortunately dcraw doesn't perform this operation like other raw converters like the Panasonic converter, SilkyPix, and Adobe ACR so I had to write my own code to fix the flaw in dcraw.  This whole concept of shifting some of the lens optics to software is interesting enough that it will be next months article here.  Stay tuned.

Mike
Logged
Terry-M
The Honourable Metric Mann
Forum Superhero
*****
Posts: 3197



View Profile WWW
« Reply #4 on: July 17, 2009, 10:38:44 AM »

Quote
That's the next step.  Now that I've written my own code to correct lens distortions, you'll see it in the batch filter in the future
That would be enough for me. I'm already trying to imagine how it would be implemented, something like the Straighten Tool on a distorted element, and click on a fringe in the enlarged pre-view. That's just guessing and I don't expect an answer now  Wink
I'll read your next article with interest  Smiley
Terry.
Logged
tomc
Jr. Member
**
Posts: 52


View Profile
« Reply #5 on: July 17, 2009, 04:21:35 PM »

Quote
Now that I've written my own code to correct lens distortions, you'll see it in the batch filter in the future and I may even make plugins for Qimage that will allow automatic correction based on lens models.

Interesting.

You could develop a new product to go along with this feature that would supply a target and software to create the lens model based on images of the target. A geometry version of Profile Prism.


Tom
Logged
admin
Administrator
Forum Superhero
*****
Posts: 3179



View Profile Email
« Reply #6 on: July 17, 2009, 08:00:38 PM »

Quote
Now that I've written my own code to correct lens distortions, you'll see it in the batch filter in the future and I may even make plugins for Qimage that will allow automatic correction based on lens models.

Interesting.

You could develop a new product to go along with this feature that would supply a target and software to create the lens model based on images of the target. A geometry version of Profile Prism.


Tom

That's one of the first things I thought about while working on this project.  It wouldn't be that difficult to do but the process itself is tedious.  There are also a number of issues such as the need to take multiple pictures of the target at different focal lengths while still getting the target to cover the entire frame: that can be difficult at the wide angle end in particular.  All of these can be overcome of course, with the right amount of time and development.  It's a possibility.

Mike
Logged
Fred A
Forum Superhero
*****
Posts: 5368



View Profile WWW Email
« Reply #7 on: July 19, 2009, 11:26:32 AM »

So I decided to have a look at the barrel distortion on my Canon "L" 17-40mm lens. (750.00). Not that bad, but it is there, and undeniably so.
The write-ups on that lens indicated that there was plenty.
Quote
Distortion ranges from moderately strong barrel distortion at 17mm to mild pincushion at 40mm with 24mm being the approximate point of minimal distortion. As usual, closer distances resulted in stronger distortion and significantly less distortion will be noticeable on 1.6x FOVCF bodies. You will likely notice the barrel distortion in the full-frame 17mm ISO 12233 resolution chart sample crops.
I guess I look forward to the distortion correction feature too.

Fred

Logged
Terry-M
The Honourable Metric Mann
Forum Superhero
*****
Posts: 3197



View Profile WWW
« Reply #8 on: July 19, 2009, 02:04:48 PM »

Quote
barrel distortion on my Canon "L" 17-40mm lens. (750.00). Not that bad,
Want to see it really bad, look below from a Canon 17-85 f4-f5.6 at 18mm. Chromatic aberration is not good at the wide end either. Things do improve significantly at 20mm and above.
The Right Hand image was corrected with PTLens using their database of lens characteristics.
Terry
Logged
admin
Administrator
Forum Superhero
*****
Posts: 3179



View Profile Email
« Reply #9 on: July 19, 2009, 04:31:16 PM »

Want to see it really bad, look below from a Canon 17-85 f4-f5.6 at 18mm.

Look, a bay window!  Oh wait... NOT!  Cheesy  I'm looking into making a lens database in Qimage but for sure, you'll be able to do these corrections manually in Qimage soon.  The database may come later.

Mike
« Last Edit: July 19, 2009, 04:33:09 PM by Mike Chaney » Logged
Terry-M
The Honourable Metric Mann
Forum Superhero
*****
Posts: 3197



View Profile WWW
« Reply #10 on: July 19, 2009, 04:37:38 PM »

Quote
you'll be able to do these corrections manually in Qimage soon.
That'll suit me; I can always make a little library of filters to save time, a personal database. That's assuming it'll be in the batch Filter.
Terry
Logged
Peter_Corser
Newbie
*
Posts: 15


View Profile Email
« Reply #11 on: August 01, 2009, 04:39:12 PM »

Mike

Just caught up with this thread.

Tom Niemann's PTLens basically does this - the problem of doing all the testing and targets is basically covered by specifying the requirements for test files (on the web site) and requesting users to generate and transfer them to him.  Would this approach help you?

PTLens is pretty good at correcting the distortions (not quite as good as DxOptic Pro can produce) but having this facility in QI would be really useful.

Peter
Logged
Pages: [1]
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!