[rollei_list] Re: Verticals at edge of frame
- From: Kirk Thompson <thompsonkirk@xxxxxxxxxxx>
- To: Rollei List <rollei_list@xxxxxxxxxxxxx>
- Date: Mon, 12 Dec 2011 08:03:41 -0800
"Loss of image information" should not be a significant problem. If you make a
16-bit scan at 3200 ppi, you have enough info for a print of about 24x24" @ 300
ppi. Hardly a problem in any reasonable perspective crop - unless you're
trying to turn a pyramid into a square?
Kirk
> Date: Sun, 11 Dec 2011 23:06:39 -0300
> Subject: [rollei_list] Re: Verticals at edge of frame
> From: cmfreaza@xxxxxxxxx
> To: rollei_list@xxxxxxxxxxxxx
>
> 2011/12/11 Kirk Thompson <thompsonkirk@xxxxxxxxxxx>:
> > Are you working in the wet darkroom, or the digital one? If the latter, you
> > just do a Crop with the Perspective box checked in Photoshop, and align the
> > sides of the image with the offending verticals. You end up with a square
> > again. This has been a feature of PS for years, & I suppose most other
> > programs have it now.
> >
> > Every camera becomes a view camera this way!
>
> Yes, that is an useful tool I have sometimes used to correct
> significant perspective errors due to a wrong camera position during
> the picture taking if post-processing scanned negs or slides for a
> digital print and/or for the web, however this correction is not for
> free, you lose image info during the correction and then it's always
> better to keep the camera right position during the picture taking.
> Using a view camera you don't lose image info because you already
> composed the image for the picture taking with the camera perspective
> correction means; f.e., it often happens a trapezoidal distortion for
> a rectangular door, if the door has a detail above or on the wall you
> could lose or you could partly crop this detail during the PS
> perspective correction, it does not happen with a view camera.
> You can also correct perspective errors with the enlarger tilting the
> part with the neg or the paper or both.
> Carlos
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