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Keystoning not always working

Richard Allen
I have had a few images where the keystoning in Pro 8 doesn't work as expected, especially for verticals.

Have you had this happen to you and is it a 'bug' with Capture One?
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  • SFA
    Might it be possible to describe what aspect does not seem to be working and what you were expecting that you are not seeing?


    Grant
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  • Richard Allen
    I've posted a screen shot of what I'm referring to here...

    https://drive.google.com/file/d/0BzpHeS ... sp=sharing

    I couldn't find a way to insert the image on this forum, but being new here that doesn't mean too much... LOL

    The column on the right is 'almost vertical but the column on the left is no where near.

    This has happened to me a few time, in fact just now as I again attempt to use keystoning on another image.
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  • SFA
    [quote="NN634977671267089647UL" wrote:
    I've posted a screen shot of what I'm referring to here...

    https://drive.google.com/file/d/0BzpHeS ... sp=sharing

    I couldn't find a way to insert the image on this forum, but being new here that doesn't mean too much... LOL

    The column on the right is 'almost vertical but the column on the left is no where near.

    This has happened to me a few time, in fact just now as I again attempt to use keystoning on another image.



    Linking from an external location is the correct way to provide in image post.

    Are you using automated keystone adjustments or setting the adjustments manually?

    Or perhaps a combination of both?

    How much adjustment are you expecting/trying to achieve?



    Grant
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  • Richard Allen
    I'm using automatic keystoning using the guides; I've only been using Capture One for a week now and didn't know that you could adjust keystoning manually.
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  • SFA
    [quote="NN634977671267089647UL" wrote:
    I'm using automatic keystoning using the guides; I've only been using Capture One for a week now and didn't know that you could adjust keystoning manually.


    Ah, much to discover.

    The left hand side has not got much of a column to work with really. That said although I'm not a frequent user of Keystone adjustment I think the auto adjust feature is intended as a quick tweak in most situations - a starting point, if you will, for something to show a client instantly when required. The manual adjustment can build on that or simply replace it.

    Have you found the manual option now? Centre set of menu icons between the rotate symbol and the spot circle. Right click to see the 3 modes available.

    HTH.



    Grant
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  • Richard Allen
    Thank you for your time in responding; that is the keystoning control I have been using.

    I've been using Lightroom for many years now and that has no problems with keystoning and even has a great manual option should the automatic function not work as expected.

    I just wish Capture One was as good as Lightroom for managing keystoning and general lens correction.
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  • Ian Wilson
    Moderator
    Top Commenter
    So to be clear, what I would expect to do to correct keystoning in your picture is

    (1) click the keystone button on the toolbar in the middle at the top. You currently show the Select tool in use, the orange pointer symbol. The keystone one is 5 to the right of that with two lines leaning in towards each other. Click that.

    (2) This brings up some white dotted guidelines on the screen with little circles you can drag around.

    (3) Drag the circles to get one guideline lined up on the edge of the right hand pillar, and drag the other one to line up on the edge of the left hand pillar. The left pillar is quite short, so you could zoom in to get that one accurately aligned.

    (4) Once you have moved the guidelines an "Apply" button appears - click it, and the picture adjusts. See if you like the result.

    Note that by default, C1 adjusts the picture by 80% of the amount that would get the verticals truly vertical. It is thought that when correcting the perspective of a building, say, this looks more natural than 100%. But if you go to the Composition tab (sixth from the left in your screenshot) you can change the percentage to what suits you. You can also see there what adjustment the tool has made. You'll commonly find that even if you are doing a vertical keystone correction, the tool may also have applied a small amount of horizontal correction and a bit of rotation. Also if you prefer, you can forget the keystone tool and in the composition tab drag the sliders manually until you think the picture looks right. I think I would only do that if either I didn't like the result I got using the tool, or if there were no obvious verticals or horizontals to work from.

    Maybe that was the way you were using it, but I wasn't sure. Sorry if I'm teaching you something you already knew.

    Ian
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  • Richard Allen
    Ian,
    Thank you for your very clear explanation and I was doing exactly what you stated from 1 to 4.

    What I find most perplexing is that it's only the odd image that the keystoning doesn't work as expected on; it might be an image with drastic verticals or one that is only slightly out, there's no pattern to it.

    A special thank you for pointing out to me the 'Composition' tab where I can now see where I can manually adjust the keystoning; I'm a happy man now... 😉

    Regards
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