Newbie question on Keystone correction

Steve Dolan

• 2016年05月10日 20:16

Hello, I'm switching from Aperture to CO and confused by the Keystone tool. I shoot a lot of artists artwork and in the past was round-tripping between Aperture and DXO OP primarily for the keystone correction in DXO. I was excited to see the inclusion of a keystone tool in CO but it is performing differently than expected. When I try to correct a square or rectangle painting using the Keystone tool the final image comes out skewed, not square. I've checked to make sure I am setting the keystone amount to 100% am I missing something else? Also is there an option somewhere to have a larger preview like the focus window when moving the points for better accuracy? (or better yet a loupe style pop up when dragging a point)

Thanks

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  Ian Wilson

  Moderator

  • 2016年05月13日 08:49

  

  I recently took some photos for an artist of her paintings. I lined up the camera on a tripod as straight on to the artwork as I could manage, but inevitably I didn't get it exactly right. I found the keystone tool helped me get the final output correctly rectangular, though.
  
  Sorry if this is too obvious a point, but have you tried using the option for horizontal and vertical adjustments combined? On the toolbar, if you click and hold the keystone button you find there are three options, vertical (button with 2 converging vertical lines), horizontal (button with 2 converging horizontal lines) and combined (button with 4 converging lines). I would use the third option. Then drag the 4 markers to the 4 corners of the artwork, then click the apply button that is in the centre of the screen. This usually produces the desired result. You then have to crop off some edges.
  
  (However, I have found that it has its limitations - if I take a picture of something that is meant to be rectangular from a very extreme angle, it doesn't correct it - for example a photo of a picture high on a wall taken from the side and below can apparently be too much for it and it the attempt to correct produces a very strange result.)
  
  Hope that helps.
  
  Ian

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  peter Frings

  • 2016年05月13日 12:22

  I had a few of those skewed images as well, using the H+V keystone tool. I found that sometimes (not sure of the cases), resetting the crop/rotation/keystone first solved the skewed result.
  
  HTH,
  Peter.

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