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Keystone vs. Rotation (and flip)

PostPosted: Sun Feb 03, 2019 6:22 pm
by CBF23
I find when I want to straighten a building exterior or an interior room shot that I sometimes get better results with one, sometimes with the other. I have to play around to see what's best.

Can anyone explain the difference between how these tools work? What circumstances factor in choosing one over the other?

Re: Keystone vs. Rotation (and flip)

PostPosted: Sun Feb 03, 2019 7:31 pm
by Ian3
Perhaps the best result is obtained by first straightening the image then applying keystone corrections if needed.

If there is a keystone issue, then remember that verticals at the edges of the frame are no good for straightening by - of course they lean in, or out as the case may be. So I usually try to straighten by reference to something in the centre of the image. After that I apply the keystone correction if I want to.

Ian

Re: Keystone vs. Rotation (and flip)

PostPosted: Mon Feb 04, 2019 12:08 am
by SFA
Straighten would be related to correcting a general misalignment of the camera - for example an horizon that is not horizontal but of course might also be used for an equivalent vertical line or even to deliberately rotate the image for artistic effect.

Keystone relates more to perspective than rotation.

https://blog.phaseone.com/how-to-correc ... tone-tool/

HTH.


Grant

Re: Keystone vs. Rotation (and flip)

PostPosted: Mon Feb 04, 2019 2:18 pm
by Paul_Steunebrink
I use the Keystone tool a lot. Since it includes rotation during its operation, I use it for rotation purposes as well.

Re: Keystone vs. Rotation (and flip)

PostPosted: Mon Feb 04, 2019 4:44 pm
by SFA
Paul_Steunebrink wrote:I use the Keystone tool a lot. Since it includes rotation during its operation, I use it for rotation purposes as well.


But would you use it if all you wanted to do was a quick rotation adjustment on a horizon line?

Re: Keystone vs. Rotation (and flip)

PostPosted: Mon Feb 04, 2019 9:00 pm
by Paul_Steunebrink
SFA wrote:
Paul_Steunebrink wrote:I use the Keystone tool a lot. Since it includes rotation during its operation, I use it for rotation purposes as well.

But would you use it if all you wanted to do was a quick rotation adjustment on a horizon line?

No