On 10/18/2010 4:57 PM, Chuck Norcutt wrote:
> No PhotoShop required. You can use PTLens which is better than PhotoShop and
> costs only $25.
Not better for me. the 'vertical tilt, horizontal tilt, angle' model used in
both PTLens and the Lens Correction filters
in ACR and PS just doesn't work well for me. I worked on a skylight image for
ages in it and never did get what I
considered a fully satisfactory result.
I much prefer the PS Edit=>Transform functions. They just work much better for
me. I can combine perspective correction
with Distort, Rotate and Warp. (Yeah, I know, they aren't available in ACR. I
don't serious editing in ACR anyway.)
I not uncommonly find slight irregularities in straight features that require
more than overall correction. I don't know
if they are subtle errors in the PTL linear distortion or what, but Warp fixes
'em. I love that I can switch between
tools in Transform, do all kinds of fooling around, and have it all applied to
the underlying image at once. There's no
cumulative artifact creation from multiple corrections.
I assume other image editors have perspective correction functions. (PWP has a
Warp function, but it's a completely
different thing than in PS. It's the perspective correction tool, and less
intuitive to use.)
> While those of us with PhotoShop use the plug-in version, PTLens also comes
> as a stand-alone version and also as an external editor for Lightroom. Both
> PC and Mac are supported.
> <http://epaperpress.com/ptlens/index.html>
To make it clearer, the $25 buys you both plug-in and stand alone versions, for
life. I think I bought in at $5, years
ago. Talk about getting value for money!
> One really great feature of PTLens is a database of lenses which has built-in
> distortion correction parameters. ... For digital images having lens data
> in the EXIF data the correct lens is chosen automatically.
Yup. Slick as a whistle. I love PTLens, particularly as I have lenses with
really interesting waveform distortion at
their wide ends. :-)
> If you're going to be be bending pixels to correct perspective than having
> lots of pixels is an advantage to help maintain resolution.
The more the merrier, for distortion correction. Still, I've never had a
problem I noticed with the 5D's ~13 MPs.
Moose
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