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Barrel Distortion

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strawman
strawman  1022006 forum posts United Kingdom16 Constructive Critique Points
10 Nov 2012 - 9:25 AM

I would swear that in my camera it applies corrections to the RAW image, white balance, distortion etc, but the RAW image is a RAW image, so you do not want to process it in an auto way. Having said that DPP looks to have a correction ability built in so it can auto correct the RAW. I will check that later (I seldom use JPEG) but it is very common for the cameras to perform in-camera correction for distortion and CA in camera for JPEG.

Last Modified By strawman at 10 Nov 2012 - 9:25 AM
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10 Nov 2012 - 9:25 AM

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SlowSong
SlowSong e2 Member 64365 forum postsSlowSong vcard England28 Constructive Critique Points
10 Nov 2012 - 9:37 AM

I wouldn't have thought there would be any in-camera corrections to a RAW image with regard to distortion.
The jpgs are "corrected" in other ways to a certain extent but the actual "shape" of the image wouldn't be corrected. Unless there is some very clever lens correction mode in-camera, which would be redundant if the camera was set up to auto-correct this anyway at the outset. So DMing is the only way to correct it.

This distortion happens on DSLRs too obviously and can be corrected easily, I was only surprised at the amount of distortion using the compacts. I never noticed anything like this when using film. Grin

Last Modified By SlowSong at 10 Nov 2012 - 9:40 AM
Jestertheclown
10 Nov 2012 - 1:04 PM

I'll stand to be corrected but I've always been under the impression that RAW files were just that.
They're what the cameras 'sees' through whatever lens is put in front of it and they're served up without any correction/modification at all.

SlowSong
SlowSong e2 Member 64365 forum postsSlowSong vcard England28 Constructive Critique Points
10 Nov 2012 - 3:14 PM


Quote: I'll stand to be corrected but I've always been under the impression that RAW files were just that.
They're what the cameras 'sees' through whatever lens is put in front of it and they're served up without any correction/modification at all.

Exactly. So I can't understand what strawman means.

Carabosse
Carabosse e2 Member 1139395 forum postsCarabosse vcard England269 Constructive Critique Points
10 Nov 2012 - 5:24 PM

I don't think RAW files are quite as 'raw' as one might imagine. Wink

For example, noise reduction can be applied by the camera.

SlowSong
SlowSong e2 Member 64365 forum postsSlowSong vcard England28 Constructive Critique Points
10 Nov 2012 - 5:52 PM

The optimum word here is "can" (i.e. deliberately set the camera up to do so). I don't think you can correct distortion in-camera, jpg or raw.

Last Modified By SlowSong at 10 Nov 2012 - 5:53 PM
strawman
strawman  1022006 forum posts United Kingdom16 Constructive Critique Points
10 Nov 2012 - 11:10 PM

Hi sorry I have typed incorrectly.

I meant to say.


Quote: I would swear that in my camera it applies corrections to the JPEG image, white balance, distortion etc,

Sorry was typing and thinking of something else at the same time. :-(

Some pictures of a photo to make distortion look bad. First straight C1 RAW process and it looks bad
c1-raw.jpg
Next the camera produced JPEG it is a lot better
camera-jpeg.jpg
And DPP as it comes about same as JPEG
dpp-raw1.jpg
Finally DPP with lens correction, best of the lot
dpp-corr1.jpg

When I saw this in the past I just assumed that the in-camera JPEG has some distortion correction applied, and DPP has a default level of correction that can be improved upon. Any other views?

Last Modified By strawman at 10 Nov 2012 - 11:31 PM
Paul Morgan
Paul Morgan e2 Member 1315199 forum postsPaul Morgan vcard England6 Constructive Critique Points
11 Nov 2012 - 1:40 AM


Quote: For example, noise reduction can be applied by the camera

Yes, to Jpegs, settings can sometimes be set to raw images, but the changes are not permanent and can be later changed in raw software.

I can remember reading a review about the Olympus 12mm, a lot depended on what computer the reviewer was using.

His windows PC and software corrected the barrel distortion, his Apple PC and software did not.

Last Modified By Paul Morgan at 11 Nov 2012 - 1:43 AM

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