[LRflex] Re: TECH: Questions on quality and taste.

Hi Philippe,

just saw the shot (very nice). It's an interesting example of  
perspective. Normally you have one vanishing point on which all  
horizontal lines converge. A square then gets distorted into a sort  
of trapezium. Which can be corrected easily in photoshop.

You have two vanishing points! What you would need to do is two  
corrections - one for each half.

I haven't done this myself yet - I may try it later. If you want to  
try it type "perspective" into the help field.

Hope this helps.

colin


On 25.01.2007, at 18:20, Philippe Amard wrote:

> Thanks David,
> the shot was taken with the zoom at the shorter end, hence creating
> curved distortion - and the perspective correction feature in PS is  
> not
> appropriate enough as it apparently moves straight lines.  
> "Torsion" (DK
> if the English version uses this term, twist maybe?), helped a little
> better but not much. The outer walls are parallel to the frame, but
> there is still, and you're right in that respect, much to be  
> desired in
> the final picture. I wish there was some (cheap or better, free)
> programme that would allow the curves to be reversed.
>
> Thanks again for all.
> Phileicangemix.
>
> David Young wrote:
>
>> Philippe  showed:
>>
>>
>>
>>> 1) I recently posted a snap of Temple Bar on the LUG Gallery and  
>>> David
>>> suggested the verticals were not what they should be - and I  
>>> assume he
>>> was right.
>>> I have used PS to try and improve on it a bit.
>>> I'd like your comments on the results. The pictures can be found  
>>> here.
>>> <http://gallery.leica-users.org/v/Phileica/IRELAND-2oo7/?g2_page=2>
>>>
>>>
>>
>> It looks much better, Philippe. Almost too much better.  To my
>> (weird) eyes, it looks as if the building has been over corrected,
>> and is now falling outwards, at the top.  Yet, if you look carefully,
>> the sign on the right and the windows on the left appear to be
>> perfect.  Thus, the result I see is an optical "delusion".
>>
>> I cannot help with the staircase... sorry!
>>
>> Cheers!
>> ---
>>
>> David Young,
>> Logan Lake, CANADA
>>
>> Wildlife Photographs: http://www.telyt.com/
>> Personal Web-pages: http://www3.telus.net/~telyt
>>
>>
>>
>>
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