Image talk:Nat-gall-lond-tr-sq.jpg

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copied from User talk:Arpingstone

Hi. Just a quick note about my National Gallery photograph that's currently on Wikipedia:Featured picture candidates. I'm not sure what you meant by "clearly leaning" - the columns in the photograph are vertical and the steps in the foreground are horizontal. The only reason that the roof appears to be sloping is due to perspective because I took the photograph from left-of-centre, so that I could include the Trafalgar Square fountain... but that's not something that I would have thought could be fixed by rotating the image. - MykReeve 17:57, 28 Jun 2004 (UTC)

Hi, sorry to speak adversely of your otherwise excellent photo but I'll show you what I mean. I've measured the leftmost column in Photoshop, it's about 2 degrees leaning and the rightmost column about 0.5 degrees. Sounds trivial I know but, to me, it shows. So I've tried rotating the pic by 1.2 degrees counterclockwise and here's the result:

Original pic

Image:Nat-gall-lond-tr-sq.rotate.jpg Rotated pic

You may well not agree, but to me the left pic is more or less as the eye would see the building and the unrotated pic on the right is leaning to the right. Sorry I can't change my mind on this and support the pic, Best Wishes, Adrian - Adrian Pingstone 21:47, 28 Jun 2004 (UTC)

I certainly don't mind the criticism... I see what you mean now. I think the apparent rotation is due to the fact that I had tilted the camera upwards, meaning that the building can never be entirely vertical - for example, the columns at the right hand side of the image tilt up and to the left more in the rotated image. I agree that the central section of the gallery looks more upright in the rotated image, but in the unrotated image, the steps are horizontal - which means that the part of the building in the centre of the picture is genuinely vertical.

Image:Nat-gall-lond-tr-sq.rotate-lines.jpg Annotated rotated pic

I've created a little image to illustrate this - Media:Persp-ng.png - the left hand image has the vertical part of the "columns" in the middle of the image (but not at the centre of the set of "columns"), the right hand image has been rotated so that the vertical part of the box is to the left of centre (but is at the centre of the set of "columns"). The "columns" of the right hand image look better - but any other parts of the image would be excessively rotated. I guess neither version is ideal. - MykReeve 23:39, 28 Jun 2004 (UTC)

OK, I follow you. Thanks for the perspective pics, they are interesting. I guess full correction would need a Photoshop or Elements or Paint Shop Pro expert which I certainly am not! I love the picture by the way, and I've commented on it only because it's on the Featured Picture Candidates page. Best Wishes, Adrian.

Adrian Pingstone 07:37, 29 Jun 2004 (UTC)

I think the problem with the rotated pic is that the water isn't level... see the red lines in the bottom picture. For me, wonky water makes the rotated pic worse than the origianal. Lupin 10:45, 1 Jul 2004 (UTC)

Sorry to butt in, but I would apply perspective distortion on the rotated image. I.E. to go from ">" to "=" by applying "<". Hope that makes sense! Don't know about Photoshop, but this is available in PSP. Either do all that, or stick with the rotated image, which has perspective distortion, diminishing to the right. The vertical pillars and non-horizontal water is, I would imagine, more accurate. Zoney 11:02, 1 Jul 2004 (UTC)

OK, I've had a go at this with the GIMP. What do you think? Lupin 23:10, 1 Jul 2004 (UTC)

Original pic

GIMPed pic (perspective corrected, hopefully)

Actually, that's really rather good. Shall we use that, instead? Also, I think it'd be best to move this discussion to Image talk:Nat-gall-lond-tr-sq.jpg rather than keep it on Adrian's talk page... I've copied the text there. James F. (talk) 23:26, 6 Jul 2004 (UTC)