I suppose it depends on how many pixels you've got and how large a print
you might produce. One could also do some of both. But if you compress
(at least with PhotoShop) you'll have to take care of the cropping
yourself. Picture Window Pro is smarter in that respect and makes the
cropping automatic.
Chuck Norcutt
Andrew Fildes wrote:
> There's a theory that it's better to compress than stretch as it's
> less 'lossy - requires less interpolation of 'new' pixels. Don't know
> if it's true or merely plausible.
> Andrew Fildes
> afildes@xxxxxxxxxxxxx
>
>
>
> On 10/04/2009, at 10:28 PM, Chuck Norcutt wrote:
>
>> Since you've asked on-list as well as off I'm posting the same
>> response
>> here below that I sent you privately.
>>
>> Chuck Norcut
>> ---------------------------------------------
>>
>> Use Edit => Transform => Perspective (or Distort). Pull the sides of
>> the image window out away from the image about 25% on each side so you
>> have some room to work outside the bounds of the image.
>>
>> You will see that there is a bounding box drawn around the image.
>> Change the perspective by pulling or pushing the corners of the box
>> outside of or inside of the image. If you are using the "Perspective"
>> transform both sides of the box will move together and apply equal
>> correction on both sides. If you are using the "Distort" transform
>> each
>> side will move independently. In a recent post Moose commented
>> that he
>> preferred the Distort transform because sometimes it helps to be
>> able to
>> apply slightly different transforms on either side. I agree. But I
>> would suggest you try the Perspective transform first. Then, after
>> you
>> see what it does when you pull the top right corner straight out,
>> cancel
>> out and switch to Distort and adjust each side individually to... what
>> just looks right.
>>
>> Vertical perspective is altered by pushing the corners at top or
>> bottom
>> horizontally in or out. Horizontal perspective is altered by pushing
>> the corners up or down. Rarely an image may require both. But we
>> expect to see horizontal perspective as the image recedes to the
>> "vanishing point". So use horizontal perspective control sparingly if
>> at all.
>>
>> When you took this shot the camera was pointing upward causing the top
>> to angle in. To correct it pull the top corners outward. Had you been
>> at a high vantage point and were pointing the camera down the image
>> would angle in at the bottom rather than the top. In that case
>> pull the
>> bottom corners outward. You can also make corrections in the opposite
>> direction by pushing the corners inside of the image. But if you do
>> that you will be overlaying the original image area and will need to
>> crop the final output. Finally, note that both the Perspective and
>> Distort transforms have a center "handle" at the sides of the bounding
>> box. The Perspective transform doesn't allow you to do anything with
>> that. The Distort transform will allow you to evenly squeeze or
>> expand
>> the width or height of the image by pushing or pulling the center
>> handle.
>>
>> To avoid vertical perspective distortion when shooting the camera must
>> be level. To avoid horizontal perspective distortion the image plane
>> must be square to the subject. Generally, watch the vertical but
>> don't
>> sweat the horizontal.
>>
>> Hope that helps. If it's not clear ask away.
>>
>> Chuck Norcutt
>>
>>
>>
>> Nathan Wajsman wrote:
>>> Hi Chuck,
>>>
>>> As I said on the Oly list, I agree with you and really like your
>>> correction. I must admit that my Photoshop skills are not
>>> sufficient to
>>> make such a fix--so if you can tell me how you did it, I would
>>> appreciate it.
>>>
>>> Cheers,
>>> Nathan
>>>
>>> Nathan Wajsman
>>> Alicante, Spain
>>> http://www.frozenlight.eu
>>> http://www.greatpix.eu
>>> http://www.nathanfoto.com
>>>
>>> Books: http://www.blurb.com/bookstore/search?search=wajsman&x=0&y=0
>>> PICTURE OF THE WEEK: http://www.fotocycle.dk/paws
>>> Blog: http://www.fotocycle.dk/blog
>>>
>>>
>>>
>>> On Apr 9, 2009, at 12:53 PM, Chuck Norcutt wrote:
>>>
>>>> I very much like "pews" but it's calling out to be corrected.
>>>>
>>>> Chuck Norcutt
>>>>
>>>> Nathan Wajsman wrote:
>>>>> Last weekend I took the family skiing in Sierra Nevada. Since I
>>>>> don't
>>>>> ski, I used Saturday to drive to nearby Granada and have a walk
>>>>> around
>>>>> that city, my first visit there. As usual, a small gallery of
>>>>> somewhat
>>>>> eclectic images is the result:
>>>>>
>>>>> http://www.frozenlight.eu/granada0409/
>>>>>
>>>>> I did not get to the Alhambra, the queue was too long. That will
>>>>> have
>>>>> to wait for the next visit, and there will certainly be one--I
>>>>> found
>>>>> Granada to be an extremely interesting city.
>>>>>
>>>>> As always, comments and critique are welcome and appreciated.
>>>>>
>>>>> Nathan
>>>>>
>>>>> Nathan Wajsman
>>>>> Alicante, Spain
>>>>> http://www.frozenlight.eu
>>>>> http://www.greatpix.eu
>>>>> http://www.nathanfoto.com
>>>>>
>>>>> Books: http://www.blurb.com/bookstore/search?search=wajsman&x=0&y=0
>>>>> PICTURE OF THE WEEK: http://www.fotocycle.dk/paws
>>>>> Blog: http://www.fotocycle.dk/blog
>>>>>
>>>>>
>>>>>
>>>> --
>>>> _________________________________________________________________
>>>> Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
>>>> Archives: http://lists.thomasclausen.net/mailman/private/olympus/
>>>> Themed Olympus Photo Exhibition: http://www.tope.nl/
>>>>
>>>
>>>
>> --
>> _________________________________________________________________
>> Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
>> Archives: http://lists.thomasclausen.net/mailman/private/olympus/
>> Themed Olympus Photo Exhibition: http://www.tope.nl/
>>
>>
>
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