Are perspective transforms legal in Advanced?

Nikon AF-S NIKKOR 24-70mm f/2.8G ED

01/25/2006 06:26:34 PM · #1

Are perspective and/or distort transforms legal in Advanced Rules?

Thanks

Brent_Ward

Canon EOS-5D

Canon EF 85mm f/1.2L USM

01/25/2006 06:29:33 PM · #2

Originally posted by fotomann_forever:

Are perspective and/or distort transforms legal in Advanced Rules?

Thanks

I believe not.

rjkstesch

Nikon D700

01/25/2006 06:31:29 PM · #3

I understood you could correct perspective in Advance, but not Basic.

Becky

Fisher Price Kid-Tough Digital

01/25/2006 06:35:11 PM · #4

SC?

Just to clarify it's for corrective purposes, not effects.

LalliSig

01/25/2006 06:44:59 PM · #5

I posted this thread a while ago regarding my "Destinations" entry, there is a link in the text with the outtake to a thread that discusses it. Hope this helps :)

rjkstesch

Nikon D700

Nikon AF-S NIKKOR 24-70mm f/2.8G ED

01/25/2006 06:46:34 PM · #6

It was discussed in this thread, too. Forum Thread

Becky

Sony 24-70mm F4 Vario-Tessar T* FE OSS

01/25/2006 06:58:03 PM · #7

hmmm... thanks guys... still a bit confused...

let's say I took a picture of a grid... but I was slightly off in angle shooting the grid and want to get the grid lines straight both horizontally and vertically. Just corrective use under advanced rules.

Bear_Music

Samsung Galaxy S24 Ultra

01/25/2006 07:01:02 PM · #8

Originally posted by fotomann_forever:

My understanding is that in Advanced Editing the correction of lens and perspective distortions is allowed.

R.

01/25/2006 07:41:31 PM · #9

I'd think so, too. Don't see anything in the rules that doesn't allow it. Just wanted to get some input on it, to make sure I don't get DQ'd.

01/25/2006 09:53:21 PM · #10

bump... perhaps some SC are around

Canon 12x IS USM (S3 IS built-in Lens) -- 36-432mm (35mm EQ)

01/25/2006 10:42:52 PM · #11

Originally posted by fotomann_forever:

SC?

Just to clarify it's for corrective purposes, not effects.

Yes, under Advanced you should be able to use the Perspective or Distort tools to correct lens effects, but probably not to create new effects or objects.

Canon EF 24-105mm f/4.0L IS

01/25/2006 10:47:11 PM · #12

Originally posted by GeneralE:

Originally posted by fotomann_forever:
SC?

Just to clarify it's for corrective purposes, not effects.

Yes, under Advanced you should be able to use the Perspective or Distort tools to correct lens effects, but probably not to create new effects or objects.

Thank you, GeneralE

scalvert

Canon EOS-5D Mark III

01/25/2006 10:49:06 PM · #13

I agree with the good General.

Canon 12x IS USM (S3 IS built-in Lens) -- 36-432mm (35mm EQ)

01/25/2006 11:16:35 PM · #14

Originally posted by scalvert:

I agree with the good General.

Finally, someone does! : )

01/25/2006 11:34:07 PM · #15

From basic editing rules:

Filters: The use of filters (or non-Photoshop equivalent) is strictly limited. Any filter or stand-alone utility designed and used to preserve the integrity of the image and/or reduce the effects of noise, scratches, etc, are permitted. These include but are not limited to the Sharpen, Unsharp Mask, and Dust & Scratches filters, and standalone image cleanup utilities such as NeatImage. However, no effects filters may be applied to your image, with the exception of Noise and Gaussian Blur, which are allowed. Any filter permitted by this rule must be applied uniformly to the entire image. Selective application of any filter is prohibited.

Doesn't perspective correction fall under the category of: Any filter or stand-alone utility designed and used to preserve the integrity of the image ... couldn't perspective correction also be considered: and/or reduce the effects of noise, scratches, etc, are permitted (It is to reduce the effects of etc -- etc being lens distortion)...

That's the way I'd look at it -- so if it's legal in basic, it's legal in advanced?

--

DISCLAIMER: I am not authorized to tell anyone what is and is not legal in any editing -- I'm just asking.

Canon 12x IS USM (S3 IS built-in Lens) -- 36-432mm (35mm EQ)

01/25/2006 11:37:08 PM · #16

No, the Transform tools are not considered filters, and are not legal for Basic Rules challenges.

Canon EF 24-105mm f/4.0L IS

01/25/2006 11:40:16 PM · #17

Originally posted by GeneralE:

No, the Transform tools are not considered filters, and are not legal for Basic Rules challenges.

Maybe I'm confused as to what the transform tools are...

I'm talking about like using sphereize to a negative amount to correct wide angle distortion...maybe I'm confused as to what we're talking about.

Anyway, using sphereize, as it's a filter applied non-selectively to the entire image (meaning you don't select a portion) to correct wide angle distortion would be legal, as it is preserving the intregity of the image, and reducing the effects of lens distortion, no?

scalvert

Canon EOS-5D Mark III

01/25/2006 11:40:27 PM · #18

Originally posted by deapee:

Doesn't perspective correction fall under the category of: Any filter or stand-alone utility designed and used to preserve the integrity of the image ...

I think the issue with Basic Editing is that you're not allowed to make selections. I suspect that a global correction (without selections) using Photoshop CS2, DxO or certain RAW converters might be OK though.

Canon 12x IS USM (S3 IS built-in Lens) -- 36-432mm (35mm EQ)

01/26/2006 12:02:25 AM · #19

Originally posted by deapee:

Originally posted by GeneralE:
No, the Transform tools are not considered filters, and are not legal for Basic Rules challenges.

Maybe I'm confused as to what the transform tools are...

In Photoshop, the are not under the Filters Menu, they are under the Edit > Transform Menu, and include actions like Scale, Skew, Perspective, and Distort. They change the shape (or size) of the overall image.

01/26/2006 12:07:42 AM · #20

ahh ok...and where is sphereize -- I thought that one was in filters...but am I correct in assuming, if it is under filters, that it would be ok to use it without selections to reduce the effects of lens distortion, or preserve the integrity of the image (that is, to bring it closer to what the eye saw)?

Canon 12x IS USM (S3 IS built-in Lens) -- 36-432mm (35mm EQ)

01/26/2006 12:11:40 AM · #21

Spherize is a filter, but I'm personally not familiar enough with its controls/effects to give you a good answer -- I'm sure someone will though : )

kirbic

Canon EOS R5

Canon RF 24-70mm f/2.8 L IS

01/26/2006 12:13:40 AM · #22

Originally posted by deapee:

The basic rules do state that any filter used to preserve photographic integrity is OK. So if distortion is less *after* the filter, that qualifies.
Spherize is under filters, but it may not work as well as you'd like. If you really want accurate correction, try PTLens. It uses the PanoTools engine, and recognizes a lot of lenses from EXIF, so it does not require a lot of manual intervention, and the results are near perfect.

PhantomEWO

Canon EOS-5D Mark II

Canon EF 70-200mm f/2.8L IS USM

01/26/2006 12:19:03 AM · #23

Originally posted by kirbic:

Originally posted by deapee:
ahh ok...and where is sphereize -- I thought that one was in filters...but am I correct in assuming, if it is under filters, that it would be ok to use it without selections to reduce the effects of lens distortion, or preserve the integrity of the image (that is, to bring it closer to what the eye saw)?

The basic rules do state that any filter used to preserve photographic integrity is OK. So if distortion is less *after* the filter, that qualifies.
Spherize is under filters, but it may not work as well as you'd like. If you really want accurate correction, try PTLens. It uses the PanoTools engine, and recognizes a lot of lenses from EXIF, so it does not require a lot of manual intervention, and the results are near perfect.

So now we go from perspective and or lens distortion i. e. straighten trees or sides of building back to what the eye saw from illegal to legal. I really think this discussion is getting no where. So using PS CS2 where lens distortion does not require any selection to be made (uses entire image) is it legal or not? Can you straighten building walls to what the eye saw or do we have to leave it at angles as the wide lens saw it???